
 
XLNet
	
Overview
	
The XLNet model was proposed in XLNet: Generalized Autoregressive Pretraining for Language Understanding by Zhilin Yang, Zihang Dai, Yiming Yang, Jaime Carbonell, Ruslan Salakhutdinov,
Quoc V. Le. XLnet is an extension of the Transformer-XL model pre-trained using an autoregressive method to learn
bidirectional contexts by maximizing the expected likelihood over all permutations of the input sequence factorization
order.
The abstract from the paper is the following:
With the capability of modeling bidirectional contexts, denoising autoencoding based pretraining like BERT achieves
better performance than pretraining approaches based on autoregressive language modeling. However, relying on
corrupting the input with masks, BERT neglects dependency between the masked positions and suffers from a
pretrain-finetune discrepancy. In light of these pros and cons, we propose XLNet, a generalized autoregressive
pretraining method that (1) enables learning bidirectional contexts by maximizing the expected likelihood over all
permutations of the factorization order and (2) overcomes the limitations of BERT thanks to its autoregressive
formulation. Furthermore, XLNet integrates ideas from Transformer-XL, the state-of-the-art autoregressive model, into
pretraining. Empirically, under comparable experiment settings, XLNet outperforms BERT on 20 tasks, often by a large
margin, including question answering, natural language inference, sentiment analysis, and document ranking.
Tips:
The specific attention pattern can be controlled at training and test time using the perm_mask input.
Due to the difficulty of training a fully auto-regressive model over various factorization order, XLNet is pretrained
using only a sub-set of the output tokens as target which are selected with the target_mapping input.
To use XLNet for sequential decoding (i.e. not in fully bi-directional setting), use the perm_mask and
target_mapping inputs to control the attention span and outputs (see examples in
examples/pytorch/text-generation/run_generation.py)
XLNet is one of the few models that has no sequence length limit.
XLNet is not a traditional autoregressive model but uses a training strategy that builds on that. It permutes the tokens in the sentence, then allows the model to use the last n tokens to predict the token n+1. Since this is all done with a mask, the sentence is actually fed in the model in the right order, but instead of masking the first n tokens for n+1, XLNet uses a mask that hides the previous tokens in some given permutation of 1,…,sequence length.
XLNet also uses the same recurrence mechanism as Transformer-XL to build long-term dependencies.
This model was contributed by thomwolf. The original code can be found here.
Documentation resources
	
Text classification task guide
Token classification task guide
Question answering task guide
Causal language modeling task guide
Multiple choice task guide
XLNetConfig
	
class transformers.XLNetConfig
<
source
>
(
vocab_size = 32000
d_model = 1024
n_layer = 24
n_head = 16
d_inner = 4096
ff_activation = 'gelu'
untie_r = True
attn_type = 'bi'
initializer_range = 0.02
layer_norm_eps = 1e-12
dropout = 0.1
mem_len = 512
reuse_len = None
use_mems_eval = True
use_mems_train = False
bi_data = False
clamp_len = -1
same_length = False
summary_type = 'last'
summary_use_proj = True
summary_activation = 'tanh'
summary_last_dropout = 0.1
start_n_top = 5
end_n_top = 5
pad_token_id = 5
bos_token_id = 1
eos_token_id = 2
**kwargs
)
Parameters 
vocab_size (int, optional, defaults to 32000) —
Vocabulary size of the XLNet model. Defines the number of different tokens that can be represented by the
inputs_ids passed when calling XLNetModel or TFXLNetModel.
d_model (int, optional, defaults to 1024) —
Dimensionality of the encoder layers and the pooler layer.
n_layer (int, optional, defaults to 24) —
Number of hidden layers in the Transformer encoder.
n_head (int, optional, defaults to 16) —
Number of attention heads for each attention layer in the Transformer encoder.
d_inner (int, optional, defaults to 4096) —
Dimensionality of the “intermediate” (often named feed-forward) layer in the Transformer encoder.
ff_activation (str or Callable, optional, defaults to "gelu") —
The non-linear activation function (function or string) in the If string, "gelu", "relu", "silu" and
"gelu_new" are supported.
untie_r (bool, optional, defaults to True) —
Whether or not to untie relative position biases
attn_type (str, optional, defaults to "bi") —
The attention type used by the model. Set "bi" for XLNet, "uni" for Transformer-XL.
initializer_range (float, optional, defaults to 0.02) —
The standard deviation of the truncated_normal_initializer for initializing all weight matrices.
layer_norm_eps (float, optional, defaults to 1e-12) —
The epsilon used by the layer normalization layers.
dropout (float, optional, defaults to 0.1) —
The dropout probability for all fully connected layers in the embeddings, encoder, and pooler.
mem_len (int or None, optional) —
The number of tokens to cache. The key/value pairs that have already been pre-computed in a previous
forward pass won’t be re-computed. See the
quickstart for more information.
reuse_len (int, optional) —
The number of tokens in the current batch to be cached and reused in the future.
bi_data (bool, optional, defaults to False) —
Whether or not to use bidirectional input pipeline. Usually set to True during pretraining and False
during finetuning.
clamp_len (int, optional, defaults to -1) —
Clamp all relative distances larger than clamp_len. Setting this attribute to -1 means no clamping.
same_length (bool, optional, defaults to False) —
Whether or not to use the same attention length for each token.
summary_type (str, optional, defaults to “last”) —
Argument used when doing sequence summary. Used in the sequence classification and multiple choice models.
Has to be one of the following options:
"last": Take the last token hidden state (like XLNet).
"first": Take the first token hidden state (like BERT).
"mean": Take the mean of all tokens hidden states.
"cls_index": Supply a Tensor of classification token position (like GPT/GPT-2).
"attn": Not implemented now, use multi-head attention.
summary_use_proj (bool, optional, defaults to True) —
Argument used when doing sequence summary. Used in the sequence classification and multiple choice models.
Whether or not to add a projection after the vector extraction.
summary_activation (str, optional) —
Argument used when doing sequence summary. Used in the sequence classification and multiple choice models.
Pass "tanh" for a tanh activation to the output, any other value will result in no activation.
summary_proj_to_labels (boo, optional, defaults to True) —
Used in the sequence classification and multiple choice models.
Whether the projection outputs should have config.num_labels or config.hidden_size classes.
summary_last_dropout (float, optional, defaults to 0.1) —
Used in the sequence classification and multiple choice models.
The dropout ratio to be used after the projection and activation.
start_n_top (int, optional, defaults to 5) —
Used in the SQuAD evaluation script.
end_n_top (int, optional, defaults to 5) —
Used in the SQuAD evaluation script.
use_mems_eval (bool, optional, defaults to True) —
Whether or not the model should make use of the recurrent memory mechanism in evaluation mode.
use_mems_train (bool, optional, defaults to False) —
Whether or not the model should make use of the recurrent memory mechanism in train mode.
For pretraining, it is recommended to set use_mems_train to True. For fine-tuning, it is recommended to
set use_mems_train to False as discussed
here. If use_mems_train is set to
True, one has to make sure that the train batches are correctly pre-processed, e.g. batch_1 = [[This line is], [This is the]] and batch_2 = [[ the first line], [ second line]] and that all batches are of
equal size.
This is the configuration class to store the configuration of a XLNetModel or a TFXLNetModel. It is used to
instantiate a XLNet model according to the specified arguments, defining the model architecture. Instantiating a
configuration with the defaults will yield a similar configuration to that of the
xlnet-large-cased architecture.
Configuration objects inherit from PretrainedConfig and can be used to control the model outputs. Read the
documentation from PretrainedConfig for more information.
Examples:
	Copied
 from transformers import XLNetConfig, XLNetModel
 # Initializing a XLNet configuration
 configuration = XLNetConfig()
 # Initializing a model (with random weights) from the configuration
 model = XLNetModel(configuration)
 # Accessing the model configuration
 configuration = model.config
XLNetTokenizer
	
class transformers.XLNetTokenizer
<
source
>
(
vocab_file
do_lower_case = False
remove_space = True
keep_accents = False
bos_token = '<s>'
eos_token = '</s>'
unk_token = '<unk>'
sep_token = '<sep>'
pad_token = '<pad>'
cls_token = '<cls>'
mask_token = '<mask>'
additional_special_tokens = ['<eop>', '<eod>']
sp_model_kwargs: typing.Union[typing.Dict[str, typing.Any], NoneType] = None
**kwargs
)
Parameters 
vocab_file (str) —
SentencePiece file (generally has a .spm extension) that
contains the vocabulary necessary to instantiate a tokenizer.
do_lower_case (bool, optional, defaults to True) —
Whether to lowercase the input when tokenizing.
remove_space (bool, optional, defaults to True) —
Whether to strip the text when tokenizing (removing excess spaces before and after the string).
keep_accents (bool, optional, defaults to False) —
Whether to keep accents when tokenizing.
bos_token (str, optional, defaults to "<s>") —
The beginning of sequence token that was used during pretraining. Can be used a sequence classifier token.
When building a sequence using special tokens, this is not the token that is used for the beginning of
sequence. The token used is the cls_token.
eos_token (str, optional, defaults to "</s>") —
The end of sequence token.
When building a sequence using special tokens, this is not the token that is used for the end of sequence.
The token used is the sep_token.
unk_token (str, optional, defaults to "<unk>") —
The unknown token. A token that is not in the vocabulary cannot be converted to an ID and is set to be this
token instead.
sep_token (str, optional, defaults to "<sep>") —
The separator token, which is used when building a sequence from multiple sequences, e.g. two sequences for
sequence classification or for a text and a question for question answering. It is also used as the last
token of a sequence built with special tokens.
pad_token (str, optional, defaults to "<pad>") —
The token used for padding, for example when batching sequences of different lengths.
cls_token (str, optional, defaults to "<cls>") —
The classifier token which is used when doing sequence classification (classification of the whole sequence
instead of per-token classification). It is the first token of the sequence when built with special tokens.
mask_token (str, optional, defaults to "<mask>") —
The token used for masking values. This is the token used when training this model with masked language
modeling. This is the token which the model will try to predict.
additional_special_tokens (List[str], optional, defaults to ["<eop>", "<eod>"]) —
Additional special tokens used by the tokenizer.
sp_model_kwargs (dict, optional) —
Will be passed to the SentencePieceProcessor.__init__() method. The Python wrapper for
SentencePiece can be used, among other things,
to set:
enable_sampling: Enable subword regularization.
nbest_size: Sampling parameters for unigram. Invalid for BPE-Dropout.
nbest_size = {0,1}: No sampling is performed.
nbest_size > 1: samples from the nbest_size results.
nbest_size < 0: assuming that nbest_size is infinite and samples from the all hypothesis (lattice)
using forward-filtering-and-backward-sampling algorithm.
alpha: Smoothing parameter for unigram sampling, and dropout probability of merge operations for
BPE-dropout.
sp_model (SentencePieceProcessor) —
The SentencePiece processor that is used for every conversion (string, tokens and IDs).
Construct an XLNet tokenizer. Based on SentencePiece.
This tokenizer inherits from PreTrainedTokenizer which contains most of the main methods. Users should refer to
this superclass for more information regarding those methods.
build_inputs_with_special_tokens
<
source
>
(
token_ids_0: typing.List[int]
token_ids_1: typing.Optional[typing.List[int]] = None
)
→
List[int]
Parameters 
token_ids_0 (List[int]) —
List of IDs to which the special tokens will be added.
token_ids_1 (List[int], optional) —
Optional second list of IDs for sequence pairs.
Returns
List[int]
List of input IDs with the appropriate special tokens.
Build model inputs from a sequence or a pair of sequence for sequence classification tasks by concatenating and
adding special tokens. An XLNet sequence has the following format:
single sequence: X <sep> <cls>
pair of sequences: A <sep> B <sep> <cls>
get_special_tokens_mask
<
source
>
(
token_ids_0: typing.List[int]
token_ids_1: typing.Optional[typing.List[int]] = None
already_has_special_tokens: bool = False
)
→
List[int]
Parameters 
token_ids_0 (List[int]) —
List of IDs.
token_ids_1 (List[int], optional) —
Optional second list of IDs for sequence pairs.
already_has_special_tokens (bool, optional, defaults to False) —
Whether or not the token list is already formatted with special tokens for the model.
Returns
List[int]
A list of integers in the range [0, 1]: 1 for a special token, 0 for a sequence token.
Retrieve sequence ids from a token list that has no special tokens added. This method is called when adding
special tokens using the tokenizer prepare_for_model method.
create_token_type_ids_from_sequences
<
source
>
(
token_ids_0: typing.List[int]
token_ids_1: typing.Optional[typing.List[int]] = None
)
→
List[int]
Parameters 
token_ids_0 (List[int]) —
List of IDs.
token_ids_1 (List[int], optional) —
Optional second list of IDs for sequence pairs.
Returns
List[int]
List of token type IDs according to the given sequence(s).
Create a mask from the two sequences passed to be used in a sequence-pair classification task. An XLNet
sequence pair mask has the following format:
	Copied
0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1
| first sequence    | second sequence |
If token_ids_1 is None, this method only returns the first portion of the mask (0s).
save_vocabulary
<
source
>
(
save_directory: str
filename_prefix: typing.Optional[str] = None
)
XLNetTokenizerFast
	
class transformers.XLNetTokenizerFast
<
source
>
(
vocab_file = None
tokenizer_file = None
do_lower_case = False
remove_space = True
keep_accents = False
bos_token = '<s>'
eos_token = '</s>'
unk_token = '<unk>'
sep_token = '<sep>'
pad_token = '<pad>'
cls_token = '<cls>'
mask_token = '<mask>'
additional_special_tokens = ['<eop>', '<eod>']
**kwargs
)
Parameters 
vocab_file (str) —
SentencePiece file (generally has a .spm extension) that
contains the vocabulary necessary to instantiate a tokenizer.
do_lower_case (bool, optional, defaults to True) —
Whether to lowercase the input when tokenizing.
remove_space (bool, optional, defaults to True) —
Whether to strip the text when tokenizing (removing excess spaces before and after the string).
keep_accents (bool, optional, defaults to False) —
Whether to keep accents when tokenizing.
bos_token (str, optional, defaults to "<s>") —
The beginning of sequence token that was used during pretraining. Can be used a sequence classifier token.
When building a sequence using special tokens, this is not the token that is used for the beginning of
sequence. The token used is the cls_token.
eos_token (str, optional, defaults to "</s>") —
The end of sequence token.
When building a sequence using special tokens, this is not the token that is used for the end of sequence.
The token used is the sep_token.
unk_token (str, optional, defaults to "<unk>") —
The unknown token. A token that is not in the vocabulary cannot be converted to an ID and is set to be this
token instead.
sep_token (str, optional, defaults to "<sep>") —
The separator token, which is used when building a sequence from multiple sequences, e.g. two sequences for
sequence classification or for a text and a question for question answering. It is also used as the last
token of a sequence built with special tokens.
pad_token (str, optional, defaults to "<pad>") —
The token used for padding, for example when batching sequences of different lengths.
cls_token (str, optional, defaults to "<cls>") —
The classifier token which is used when doing sequence classification (classification of the whole sequence
instead of per-token classification). It is the first token of the sequence when built with special tokens.
mask_token (str, optional, defaults to "<mask>") —
The token used for masking values. This is the token used when training this model with masked language
modeling. This is the token which the model will try to predict.
additional_special_tokens (List[str], optional, defaults to ["<eop>", "<eod>"]) —
Additional special tokens used by the tokenizer.
sp_model (SentencePieceProcessor) —
The SentencePiece processor that is used for every conversion (string, tokens and IDs).
Construct a “fast” XLNet tokenizer (backed by HuggingFace’s tokenizers library). Based on
Unigram.
This tokenizer inherits from PreTrainedTokenizerFast which contains most of the main methods. Users should
refer to this superclass for more information regarding those methods.
build_inputs_with_special_tokens
<
source
>
(
token_ids_0: typing.List[int]
token_ids_1: typing.Optional[typing.List[int]] = None
)
→
List[int]
Parameters 
token_ids_0 (List[int]) —
List of IDs to which the special tokens will be added.
token_ids_1 (List[int], optional) —
Optional second list of IDs for sequence pairs.
Returns
List[int]
List of input IDs with the appropriate special tokens.
Build model inputs from a sequence or a pair of sequence for sequence classification tasks by concatenating and
adding special tokens. An XLNet sequence has the following format:
single sequence: X <sep> <cls>
pair of sequences: A <sep> B <sep> <cls>
create_token_type_ids_from_sequences
<
source
>
(
token_ids_0: typing.List[int]
token_ids_1: typing.Optional[typing.List[int]] = None
)
→
List[int]
Parameters 
token_ids_0 (List[int]) —
List of IDs.
token_ids_1 (List[int], optional) —
Optional second list of IDs for sequence pairs.
Returns
List[int]
List of token type IDs according to the given sequence(s).
Create a mask from the two sequences passed to be used in a sequence-pair classification task. An XLNet
sequence pair mask has the following format:
	Copied
0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1
| first sequence    | second sequence |
If token_ids_1 is None, this method only returns the first portion of the mask (0s).
XLNet specific outputs
	
class transformers.models.xlnet.modeling_xlnet.XLNetModelOutput
<
source
>
(
last_hidden_state: FloatTensor
mems: typing.Optional[typing.List[torch.FloatTensor]] = None
hidden_states: typing.Optional[typing.Tuple[torch.FloatTensor]] = None
attentions: typing.Optional[typing.Tuple[torch.FloatTensor]] = None
)
Parameters 
last_hidden_state (torch.FloatTensor of shape (batch_size, num_predict, hidden_size)) —
Sequence of hidden-states at the last layer of the model.
num_predict corresponds to target_mapping.shape[1]. If target_mapping is None, then num_predict
corresponds to sequence_length.
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(torch.FloatTensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) —
Tuple of torch.FloatTensor (one for the output of the embeddings + one for the output of each layer) of
shape (batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(torch.FloatTensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) —
Tuple of torch.FloatTensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
Output type of XLNetModel.
class transformers.models.xlnet.modeling_xlnet.XLNetLMHeadModelOutput
<
source
>
(
loss: typing.Optional[torch.FloatTensor] = None
logits: FloatTensor = None
mems: typing.Optional[typing.List[torch.FloatTensor]] = None
hidden_states: typing.Optional[typing.Tuple[torch.FloatTensor]] = None
attentions: typing.Optional[typing.Tuple[torch.FloatTensor]] = None
)
Parameters 
loss (torch.FloatTensor of shape (1,), optional, returned when labels is provided) —
Language modeling loss (for next-token prediction).
logits (torch.FloatTensor of shape (batch_size, num_predict, config.vocab_size)) —
Prediction scores of the language modeling head (scores for each vocabulary token before SoftMax).
num_predict corresponds to target_mapping.shape[1]. If target_mapping is None, then num_predict
corresponds to sequence_length.
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(torch.FloatTensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) —
Tuple of torch.FloatTensor (one for the output of the embeddings + one for the output of each layer) of
shape (batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(torch.FloatTensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) —
Tuple of torch.FloatTensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
Output type of XLNetLMHeadModel.
class transformers.models.xlnet.modeling_xlnet.XLNetForSequenceClassificationOutput
<
source
>
(
loss: typing.Optional[torch.FloatTensor] = None
logits: FloatTensor = None
mems: typing.Optional[typing.List[torch.FloatTensor]] = None
hidden_states: typing.Optional[typing.Tuple[torch.FloatTensor]] = None
attentions: typing.Optional[typing.Tuple[torch.FloatTensor]] = None
)
Parameters 
loss (torch.FloatTensor of shape (1,), optional, returned when label is provided) —
Classification (or regression if config.num_labels==1) loss.
logits (torch.FloatTensor of shape (batch_size, config.num_labels)) —
Classification (or regression if config.num_labels==1) scores (before SoftMax).
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(torch.FloatTensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) —
Tuple of torch.FloatTensor (one for the output of the embeddings + one for the output of each layer) of
shape (batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(torch.FloatTensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) —
Tuple of torch.FloatTensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
Output type of XLNetForSequenceClassification.
class transformers.models.xlnet.modeling_xlnet.XLNetForMultipleChoiceOutput
<
source
>
(
loss: typing.Optional[torch.FloatTensor] = None
logits: FloatTensor = None
mems: typing.Optional[typing.List[torch.FloatTensor]] = None
hidden_states: typing.Optional[typing.Tuple[torch.FloatTensor]] = None
attentions: typing.Optional[typing.Tuple[torch.FloatTensor]] = None
)
Parameters 
loss (torch.FloatTensor of shape (1,), optional, returned when labels is provided) —
Classification loss.
logits (torch.FloatTensor of shape (batch_size, num_choices)) —
num_choices is the second dimension of the input tensors. (see input_ids above).
Classification scores (before SoftMax).
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(torch.FloatTensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) —
Tuple of torch.FloatTensor (one for the output of the embeddings + one for the output of each layer) of
shape (batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(torch.FloatTensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) —
Tuple of torch.FloatTensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
Output type of XLNetForMultipleChoice.
class transformers.models.xlnet.modeling_xlnet.XLNetForTokenClassificationOutput
<
source
>
(
loss: typing.Optional[torch.FloatTensor] = None
logits: FloatTensor = None
mems: typing.Optional[typing.List[torch.FloatTensor]] = None
hidden_states: typing.Optional[typing.Tuple[torch.FloatTensor]] = None
attentions: typing.Optional[typing.Tuple[torch.FloatTensor]] = None
)
Parameters 
loss (torch.FloatTensor of shape (1,), optional, returned when labels is provided)  —
Classification loss.
logits (torch.FloatTensor of shape (batch_size, sequence_length, config.num_labels)) —
Classification scores (before SoftMax).
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(torch.FloatTensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) —
Tuple of torch.FloatTensor (one for the output of the embeddings + one for the output of each layer) of
shape (batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(torch.FloatTensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) —
Tuple of torch.FloatTensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
Output type of XLNetForTokenClassificationOutput.
class transformers.models.xlnet.modeling_xlnet.XLNetForQuestionAnsweringSimpleOutput
<
source
>
(
loss: typing.Optional[torch.FloatTensor] = None
start_logits: FloatTensor = None
end_logits: FloatTensor = None
mems: typing.Optional[typing.List[torch.FloatTensor]] = None
hidden_states: typing.Optional[typing.Tuple[torch.FloatTensor]] = None
attentions: typing.Optional[typing.Tuple[torch.FloatTensor]] = None
)
Parameters 
loss (torch.FloatTensor of shape (1,), optional, returned when labels is provided) —
Total span extraction loss is the sum of a Cross-Entropy for the start and end positions.
start_logits (torch.FloatTensor of shape (batch_size, sequence_length,)) —
Span-start scores (before SoftMax).
end_logits (torch.FloatTensor of shape (batch_size, sequence_length,)) —
Span-end scores (before SoftMax).
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(torch.FloatTensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) —
Tuple of torch.FloatTensor (one for the output of the embeddings + one for the output of each layer) of
shape (batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(torch.FloatTensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) —
Tuple of torch.FloatTensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
Output type of XLNetForQuestionAnsweringSimple.
class transformers.models.xlnet.modeling_xlnet.XLNetForQuestionAnsweringOutput
<
source
>
(
loss: typing.Optional[torch.FloatTensor] = None
start_top_log_probs: typing.Optional[torch.FloatTensor] = None
start_top_index: typing.Optional[torch.LongTensor] = None
end_top_log_probs: typing.Optional[torch.FloatTensor] = None
end_top_index: typing.Optional[torch.LongTensor] = None
cls_logits: typing.Optional[torch.FloatTensor] = None
mems: typing.Optional[typing.List[torch.FloatTensor]] = None
hidden_states: typing.Optional[typing.Tuple[torch.FloatTensor]] = None
attentions: typing.Optional[typing.Tuple[torch.FloatTensor]] = None
)
Parameters 
loss (torch.FloatTensor of shape (1,), optional, returned if both start_positions and end_positions are provided) —
Classification loss as the sum of start token, end token (and is_impossible if provided) classification
losses.
start_top_log_probs (torch.FloatTensor of shape (batch_size, config.start_n_top), optional, returned if start_positions or end_positions is not provided) —
Log probabilities for the top config.start_n_top start token possibilities (beam-search).
start_top_index (torch.LongTensor of shape (batch_size, config.start_n_top), optional, returned if start_positions or end_positions is not provided) —
Indices for the top config.start_n_top start token possibilities (beam-search).
end_top_log_probs (torch.FloatTensor of shape (batch_size, config.start_n_top * config.end_n_top), optional, returned if start_positions or end_positions is not provided) —
Log probabilities for the top config.start_n_top * config.end_n_top end token possibilities
(beam-search).
end_top_index (torch.LongTensor of shape (batch_size, config.start_n_top * config.end_n_top), optional, returned if start_positions or end_positions is not provided) —
Indices for the top config.start_n_top * config.end_n_top end token possibilities (beam-search).
cls_logits (torch.FloatTensor of shape (batch_size,), optional, returned if start_positions or end_positions is not provided) —
Log probabilities for the is_impossible label of the answers.
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(torch.FloatTensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) —
Tuple of torch.FloatTensor (one for the output of the embeddings + one for the output of each layer) of
shape (batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(torch.FloatTensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) —
Tuple of torch.FloatTensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
Output type of XLNetForQuestionAnswering.
class transformers.models.xlnet.modeling_tf_xlnet.TFXLNetModelOutput
<
source
>
(
last_hidden_state: tf.Tensor = None
mems: List[tf.Tensor] | None = None
hidden_states: Tuple[tf.Tensor] | None = None
attentions: Tuple[tf.Tensor] | None = None
)
Parameters 
last_hidden_state (tf.Tensor of shape (batch_size, num_predict, hidden_size)) —
Sequence of hidden-states at the last layer of the model.
num_predict corresponds to target_mapping.shape[1]. If target_mapping is None, then num_predict
corresponds to sequence_length.
mems (List[tf.Tensor] of length config.n_layers) —
Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(tf.Tensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) —
Tuple of tf.Tensor (one for the output of the embeddings + one for the output of each layer) of shape
(batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(tf.Tensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) —
Tuple of tf.Tensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
Output type of TFXLNetModel.
class transformers.models.xlnet.modeling_tf_xlnet.TFXLNetLMHeadModelOutput
<
source
>
(
loss: tf.Tensor | None = None
logits: tf.Tensor = None
mems: List[tf.Tensor] | None = None
hidden_states: Tuple[tf.Tensor] | None = None
attentions: Tuple[tf.Tensor] | None = None
)
Parameters 
loss (tf.Tensor of shape (1,), optional, returned when labels is provided) —
Language modeling loss (for next-token prediction).
logits (tf.Tensor of shape (batch_size, num_predict, config.vocab_size)) —
Prediction scores of the language modeling head (scores for each vocabulary token before SoftMax).
num_predict corresponds to target_mapping.shape[1]. If target_mapping is None, then num_predict
corresponds to sequence_length.
mems (List[tf.Tensor] of length config.n_layers) —
Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(tf.Tensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) —
Tuple of tf.Tensor (one for the output of the embeddings + one for the output of each layer) of shape
(batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(tf.Tensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) —
Tuple of tf.Tensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
Output type of TFXLNetLMHeadModel.
class transformers.models.xlnet.modeling_tf_xlnet.TFXLNetForSequenceClassificationOutput
<
source
>
(
loss: tf.Tensor | None = None
logits: tf.Tensor = None
mems: List[tf.Tensor] | None = None
hidden_states: Tuple[tf.Tensor] | None = None
attentions: Tuple[tf.Tensor] | None = None
)
Parameters 
loss (tf.Tensor of shape (1,), optional, returned when label is provided) —
Classification (or regression if config.num_labels==1) loss.
logits (tf.Tensor of shape (batch_size, config.num_labels)) —
Classification (or regression if config.num_labels==1) scores (before SoftMax).
mems (List[tf.Tensor] of length config.n_layers) —
Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(tf.Tensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) —
Tuple of tf.Tensor (one for the output of the embeddings + one for the output of each layer) of shape
(batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(tf.Tensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) —
Tuple of tf.Tensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
Output type of TFXLNetForSequenceClassification.
class transformers.models.xlnet.modeling_tf_xlnet.TFXLNetForMultipleChoiceOutput
<
source
>
(
loss: tf.Tensor | None = None
logits: tf.Tensor = None
mems: List[tf.Tensor] | None = None
hidden_states: Tuple[tf.Tensor] | None = None
attentions: Tuple[tf.Tensor] | None = None
)
Parameters 
loss (tf.Tensor of shape (1,), optional, returned when labels is provided) —
Classification loss.
logits (tf.Tensor of shape (batch_size, num_choices)) —
num_choices is the second dimension of the input tensors. (see input_ids above).
Classification scores (before SoftMax).
mems (List[tf.Tensor] of length config.n_layers) —
Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(tf.Tensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) —
Tuple of tf.Tensor (one for the output of the embeddings + one for the output of each layer) of shape
(batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(tf.Tensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) —
Tuple of tf.Tensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
Output type of TFXLNetForMultipleChoice.
class transformers.models.xlnet.modeling_tf_xlnet.TFXLNetForTokenClassificationOutput
<
source
>
(
loss: tf.Tensor | None = None
logits: tf.Tensor = None
mems: List[tf.Tensor] | None = None
hidden_states: Tuple[tf.Tensor] | None = None
attentions: Tuple[tf.Tensor] | None = None
)
Parameters 
loss (tf.Tensor of shape (1,), optional, returned when labels is provided)  —
Classification loss.
logits (tf.Tensor of shape (batch_size, sequence_length, config.num_labels)) —
Classification scores (before SoftMax).
mems (List[tf.Tensor] of length config.n_layers) —
Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(tf.Tensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) —
Tuple of tf.Tensor (one for the output of the embeddings + one for the output of each layer) of shape
(batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(tf.Tensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) —
Tuple of tf.Tensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
Output type of TFXLNetForTokenClassificationOutput.
class transformers.models.xlnet.modeling_tf_xlnet.TFXLNetForQuestionAnsweringSimpleOutput
<
source
>
(
loss: tf.Tensor | None = None
start_logits: tf.Tensor = None
end_logits: tf.Tensor = None
mems: List[tf.Tensor] | None = None
hidden_states: Tuple[tf.Tensor] | None = None
attentions: Tuple[tf.Tensor] | None = None
)
Parameters 
loss (tf.Tensor of shape (1,), optional, returned when labels is provided) —
Total span extraction loss is the sum of a Cross-Entropy for the start and end positions.
start_logits (tf.Tensor of shape (batch_size, sequence_length,)) —
Span-start scores (before SoftMax).
end_logits (tf.Tensor of shape (batch_size, sequence_length,)) —
Span-end scores (before SoftMax).
mems (List[tf.Tensor] of length config.n_layers) —
Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(tf.Tensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) —
Tuple of tf.Tensor (one for the output of the embeddings + one for the output of each layer) of shape
(batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(tf.Tensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) —
Tuple of tf.Tensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
Output type of TFXLNetForQuestionAnsweringSimple.
XLNetModel
	
class transformers.XLNetModel
<
source
>
(
config
)
Parameters 
config (XLNetConfig) — Model configuration class with all the parameters of the model.
Initializing with a config file does not load the weights associated with the model, only the
configuration. Check out the from_pretrained() method to load the model weights.
The bare XLNet Model transformer outputting raw hidden-states without any specific head on top.
This model inherits from PreTrainedModel. Check the superclass documentation for the generic methods the
library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads
etc.)
This model is also a PyTorch torch.nn.Module subclass.
Use it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general usage
and behavior.
forward
<
source
>
(
input_ids: typing.Optional[torch.Tensor] = None
attention_mask: typing.Optional[torch.Tensor] = None
mems: typing.Optional[torch.Tensor] = None
perm_mask: typing.Optional[torch.Tensor] = None
target_mapping: typing.Optional[torch.Tensor] = None
token_type_ids: typing.Optional[torch.Tensor] = None
input_mask: typing.Optional[torch.Tensor] = None
head_mask: typing.Optional[torch.Tensor] = None
inputs_embeds: typing.Optional[torch.Tensor] = None
use_mems: typing.Optional[bool] = None
output_attentions: typing.Optional[bool] = None
output_hidden_states: typing.Optional[bool] = None
return_dict: typing.Optional[bool] = None
**kwargs
)
→
transformers.models.xlnet.modeling_xlnet.XLNetModelOutput or tuple(torch.FloatTensor)
Parameters 
input_ids (torch.LongTensor of shape (batch_size, sequence_length)) —
Indices of input sequence tokens in the vocabulary.
Indices can be obtained using AutoTokenizer. See PreTrainedTokenizer.encode() and
PreTrainedTokenizer.call() for details.
What are input IDs?
attention_mask (torch.FloatTensor of shape (batch_size, sequence_length), optional) —
Mask to avoid performing attention on padding token indices. Mask values selected in [0, 1]:
1 for tokens that are not masked,
0 for tokens that are masked.
What are attention masks?
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states (see mems output below) . Can be used to speed up sequential
decoding. The token ids which have their past given to this model should not be passed as input_ids as
they have already been computed.
use_mems has to be set to True to make use of mems.
perm_mask (torch.FloatTensor of shape (batch_size, sequence_length, sequence_length), optional) —
Mask to indicate the attention pattern for each input token with values selected in [0, 1]:
if perm_mask[k, i, j] = 0, i attend to j in batch k;
if perm_mask[k, i, j] = 1, i does not attend to j in batch k.
If not set, each token attends to all the others (full bidirectional attention). Only used during
pretraining (to define factorization order) or for sequential decoding (generation).
target_mapping (torch.FloatTensor of shape (batch_size, num_predict, sequence_length), optional) —
Mask to indicate the output tokens to use. If target_mapping[k, i, j] = 1, the i-th predict in batch k is
on the j-th token. Only used during pretraining for partial prediction or for sequential decoding
(generation).
token_type_ids (torch.LongTensor of shape (batch_size, sequence_length), optional) —
Segment token indices to indicate first and second portions of the inputs. Indices are selected in [0, 1]:
0 corresponds to a sentence A token,
1 corresponds to a sentence B token.
What are token type IDs?
input_mask (torch.FloatTensor of shape batch_size, sequence_length, optional) —
Mask to avoid performing attention on padding token indices. Negative of attention_mask, i.e. with 0 for
real tokens and 1 for padding which is kept for compatibility with the original code base.
Mask values selected in [0, 1]:
1 for tokens that are masked,
0 for tokens that are not masked.
You can only uses one of input_mask and attention_mask.
head_mask (torch.FloatTensor of shape (num_heads,) or (num_layers, num_heads), optional) —
Mask to nullify selected heads of the self-attention modules. Mask values selected in [0, 1]:
1 indicates the head is not masked,
0 indicates the head is masked.
inputs_embeds (torch.FloatTensor of shape (batch_size, sequence_length, hidden_size), optional) —
Optionally, instead of passing input_ids you can choose to directly pass an embedded representation. This
is useful if you want more control over how to convert input_ids indices into associated vectors than the
model’s internal embedding lookup matrix.
output_attentions (bool, optional) —
Whether or not to return the attentions tensors of all attention layers. See attentions under returned
tensors for more detail.
output_hidden_states (bool, optional) —
Whether or not to return the hidden states of all layers. See hidden_states under returned tensors for
more detail.
return_dict (bool, optional) —
Whether or not to return a ModelOutput instead of a plain tuple.
Returns
transformers.models.xlnet.modeling_xlnet.XLNetModelOutput or tuple(torch.FloatTensor)
A transformers.models.xlnet.modeling_xlnet.XLNetModelOutput or a tuple of
torch.FloatTensor (if return_dict=False is passed or when config.return_dict=False) comprising various
elements depending on the configuration (XLNetConfig) and inputs.
last_hidden_state (torch.FloatTensor of shape (batch_size, num_predict, hidden_size)) — Sequence of hidden-states at the last layer of the model.
num_predict corresponds to target_mapping.shape[1]. If target_mapping is None, then num_predict
corresponds to sequence_length.
mems (List[torch.FloatTensor] of length config.n_layers) — Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(torch.FloatTensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) — Tuple of torch.FloatTensor (one for the output of the embeddings + one for the output of each layer) of
shape (batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(torch.FloatTensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) — Tuple of torch.FloatTensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
The XLNetModel forward method, overrides the __call__ special method.
Although the recipe for forward pass needs to be defined within this function, one should call the Module
instance afterwards instead of this since the former takes care of running the pre and post processing steps while
the latter silently ignores them.
Example:
	Copied
 from transformers import AutoTokenizer, XLNetModel
 import torch
 tokenizer = AutoTokenizer.from_pretrained("xlnet-base-cased")
 model = XLNetModel.from_pretrained("xlnet-base-cased")
 inputs = tokenizer("Hello, my dog is cute", return_tensors="pt")
 outputs = model(**inputs)
 last_hidden_states = outputs.last_hidden_state
XLNetLMHeadModel
	
class transformers.XLNetLMHeadModel
<
source
>
(
config
)
Parameters 
config (XLNetConfig) — Model configuration class with all the parameters of the model.
Initializing with a config file does not load the weights associated with the model, only the
configuration. Check out the from_pretrained() method to load the model weights.
XLNet Model with a language modeling head on top (linear layer with weights tied to the input embeddings).
This model inherits from PreTrainedModel. Check the superclass documentation for the generic methods the
library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads
etc.)
This model is also a PyTorch torch.nn.Module subclass.
Use it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general usage
and behavior.
forward
<
source
>
(
input_ids: typing.Optional[torch.Tensor] = None
attention_mask: typing.Optional[torch.Tensor] = None
mems: typing.Optional[torch.Tensor] = None
perm_mask: typing.Optional[torch.Tensor] = None
target_mapping: typing.Optional[torch.Tensor] = None
token_type_ids: typing.Optional[torch.Tensor] = None
input_mask: typing.Optional[torch.Tensor] = None
head_mask: typing.Optional[torch.Tensor] = None
inputs_embeds: typing.Optional[torch.Tensor] = None
labels: typing.Optional[torch.Tensor] = None
use_mems: typing.Optional[bool] = None
output_attentions: typing.Optional[bool] = None
output_hidden_states: typing.Optional[bool] = None
return_dict: typing.Optional[bool] = None
**kwargs
)
→
transformers.models.xlnet.modeling_xlnet.XLNetLMHeadModelOutput or tuple(torch.FloatTensor)
Parameters 
input_ids (torch.LongTensor of shape (batch_size, sequence_length)) —
Indices of input sequence tokens in the vocabulary.
Indices can be obtained using AutoTokenizer. See PreTrainedTokenizer.encode() and
PreTrainedTokenizer.call() for details.
What are input IDs?
attention_mask (torch.FloatTensor of shape (batch_size, sequence_length), optional) —
Mask to avoid performing attention on padding token indices. Mask values selected in [0, 1]:
1 for tokens that are not masked,
0 for tokens that are masked.
What are attention masks?
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states (see mems output below) . Can be used to speed up sequential
decoding. The token ids which have their past given to this model should not be passed as input_ids as
they have already been computed.
use_mems has to be set to True to make use of mems.
perm_mask (torch.FloatTensor of shape (batch_size, sequence_length, sequence_length), optional) —
Mask to indicate the attention pattern for each input token with values selected in [0, 1]:
if perm_mask[k, i, j] = 0, i attend to j in batch k;
if perm_mask[k, i, j] = 1, i does not attend to j in batch k.
If not set, each token attends to all the others (full bidirectional attention). Only used during
pretraining (to define factorization order) or for sequential decoding (generation).
target_mapping (torch.FloatTensor of shape (batch_size, num_predict, sequence_length), optional) —
Mask to indicate the output tokens to use. If target_mapping[k, i, j] = 1, the i-th predict in batch k is
on the j-th token. Only used during pretraining for partial prediction or for sequential decoding
(generation).
token_type_ids (torch.LongTensor of shape (batch_size, sequence_length), optional) —
Segment token indices to indicate first and second portions of the inputs. Indices are selected in [0, 1]:
0 corresponds to a sentence A token,
1 corresponds to a sentence B token.
What are token type IDs?
input_mask (torch.FloatTensor of shape batch_size, sequence_length, optional) —
Mask to avoid performing attention on padding token indices. Negative of attention_mask, i.e. with 0 for
real tokens and 1 for padding which is kept for compatibility with the original code base.
Mask values selected in [0, 1]:
1 for tokens that are masked,
0 for tokens that are not masked.
You can only uses one of input_mask and attention_mask.
head_mask (torch.FloatTensor of shape (num_heads,) or (num_layers, num_heads), optional) —
Mask to nullify selected heads of the self-attention modules. Mask values selected in [0, 1]:
1 indicates the head is not masked,
0 indicates the head is masked.
inputs_embeds (torch.FloatTensor of shape (batch_size, sequence_length, hidden_size), optional) —
Optionally, instead of passing input_ids you can choose to directly pass an embedded representation. This
is useful if you want more control over how to convert input_ids indices into associated vectors than the
model’s internal embedding lookup matrix.
output_attentions (bool, optional) —
Whether or not to return the attentions tensors of all attention layers. See attentions under returned
tensors for more detail.
output_hidden_states (bool, optional) —
Whether or not to return the hidden states of all layers. See hidden_states under returned tensors for
more detail.
return_dict (bool, optional) —
Whether or not to return a ModelOutput instead of a plain tuple.
labels (torch.LongTensor of shape (batch_size, num_predict), optional) —
Labels for masked language modeling. num_predict corresponds to target_mapping.shape[1]. If
target_mapping is None, then num_predict corresponds to sequence_length.
The labels should correspond to the masked input words that should be predicted and depends on
target_mapping. Note in order to perform standard auto-regressive language modeling a  token has
to be added to the input_ids (see the prepare_inputs_for_generation function and examples below)
Indices are selected in [-100, 0, ..., config.vocab_size] All labels set to -100 are ignored, the loss
is only computed for labels in [0, ..., config.vocab_size]
Returns
transformers.models.xlnet.modeling_xlnet.XLNetLMHeadModelOutput or tuple(torch.FloatTensor)
A transformers.models.xlnet.modeling_xlnet.XLNetLMHeadModelOutput or a tuple of
torch.FloatTensor (if return_dict=False is passed or when config.return_dict=False) comprising various
elements depending on the configuration (XLNetConfig) and inputs.
loss (torch.FloatTensor of shape (1,), optional, returned when labels is provided)
Language modeling loss (for next-token prediction).
logits (torch.FloatTensor of shape (batch_size, num_predict, config.vocab_size)) — Prediction scores of the language modeling head (scores for each vocabulary token before SoftMax).
num_predict corresponds to target_mapping.shape[1]. If target_mapping is None, then num_predict
corresponds to sequence_length.
mems (List[torch.FloatTensor] of length config.n_layers) — Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(torch.FloatTensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) — Tuple of torch.FloatTensor (one for the output of the embeddings + one for the output of each layer) of
shape (batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(torch.FloatTensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) — Tuple of torch.FloatTensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
The XLNetLMHeadModel forward method, overrides the __call__ special method.
Although the recipe for forward pass needs to be defined within this function, one should call the Module
instance afterwards instead of this since the former takes care of running the pre and post processing steps while
the latter silently ignores them.
Examples:
	Copied
 from transformers import AutoTokenizer, XLNetLMHeadModel
 import torch
 tokenizer = AutoTokenizer.from_pretrained("xlnet-large-cased")
 model = XLNetLMHeadModel.from_pretrained("xlnet-large-cased")
 # We show how to setup inputs to predict a next token using a bi-directional context.
 input_ids = torch.tensor(
...     tokenizer.encode("Hello, my dog is very <mask>", add_special_tokens=False)
... ).unsqueeze(
...     0
... )  # We will predict the masked token
 perm_mask = torch.zeros((1, input_ids.shape[1], input_ids.shape[1]), dtype=torch.float)
 perm_mask[:, :, -1] = 1.0  # Previous tokens don't see last token
 target_mapping = torch.zeros(
...     (1, 1, input_ids.shape[1]), dtype=torch.float
... )  # Shape [1, 1, seq_length] => let's predict one token
 target_mapping[
...     0, 0, -1
... ] = 1.0  # Our first (and only) prediction will be the last token of the sequence (the masked token)
 outputs = model(input_ids, perm_mask=perm_mask, target_mapping=target_mapping)
 next_token_logits = outputs[
...     0
... ]  # Output has shape [target_mapping.size(0), target_mapping.size(1), config.vocab_size]
 # The same way can the XLNetLMHeadModel be used to be trained by standard auto-regressive language modeling.
 input_ids = torch.tensor(
...     tokenizer.encode("Hello, my dog is very <mask>", add_special_tokens=False)
... ).unsqueeze(
...     0
... )  # We will predict the masked token
 labels = torch.tensor(tokenizer.encode("cute", add_special_tokens=False)).unsqueeze(0)
 assert labels.shape[0] == 1, "only one word will be predicted"
 perm_mask = torch.zeros((1, input_ids.shape[1], input_ids.shape[1]), dtype=torch.float)
 perm_mask[
...     :, :, -1
... ] = 1.0  # Previous tokens don't see last token as is done in standard auto-regressive lm training
 target_mapping = torch.zeros(
...     (1, 1, input_ids.shape[1]), dtype=torch.float
... )  # Shape [1, 1, seq_length] => let's predict one token
 target_mapping[
...     0, 0, -1
... ] = 1.0  # Our first (and only) prediction will be the last token of the sequence (the masked token)
 outputs = model(input_ids, perm_mask=perm_mask, target_mapping=target_mapping, labels=labels)
 loss = outputs.loss
 next_token_logits = (
...     outputs.logits
... )  # Logits have shape [target_mapping.size(0), target_mapping.size(1), config.vocab_size]
XLNetForSequenceClassification
	
class transformers.XLNetForSequenceClassification
<
source
>
(
config
)
Parameters 
config (XLNetConfig) — Model configuration class with all the parameters of the model.
Initializing with a config file does not load the weights associated with the model, only the
configuration. Check out the from_pretrained() method to load the model weights.
XLNet Model with a sequence classification/regression head on top (a linear layer on top of the pooled output) e.g.
for GLUE tasks.
This model inherits from PreTrainedModel. Check the superclass documentation for the generic methods the
library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads
etc.)
This model is also a PyTorch torch.nn.Module subclass.
Use it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general usage
and behavior.
forward
<
source
>
(
input_ids: typing.Optional[torch.Tensor] = None
attention_mask: typing.Optional[torch.Tensor] = None
mems: typing.Optional[torch.Tensor] = None
perm_mask: typing.Optional[torch.Tensor] = None
target_mapping: typing.Optional[torch.Tensor] = None
token_type_ids: typing.Optional[torch.Tensor] = None
input_mask: typing.Optional[torch.Tensor] = None
head_mask: typing.Optional[torch.Tensor] = None
inputs_embeds: typing.Optional[torch.Tensor] = None
labels: typing.Optional[torch.Tensor] = None
use_mems: typing.Optional[bool] = None
output_attentions: typing.Optional[bool] = None
output_hidden_states: typing.Optional[bool] = None
return_dict: typing.Optional[bool] = None
**kwargs
)
→
transformers.models.xlnet.modeling_xlnet.XLNetForSequenceClassificationOutput or tuple(torch.FloatTensor)
Parameters 
input_ids (torch.LongTensor of shape (batch_size, sequence_length)) —
Indices of input sequence tokens in the vocabulary.
Indices can be obtained using AutoTokenizer. See PreTrainedTokenizer.encode() and
PreTrainedTokenizer.call() for details.
What are input IDs?
attention_mask (torch.FloatTensor of shape (batch_size, sequence_length), optional) —
Mask to avoid performing attention on padding token indices. Mask values selected in [0, 1]:
1 for tokens that are not masked,
0 for tokens that are masked.
What are attention masks?
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states (see mems output below) . Can be used to speed up sequential
decoding. The token ids which have their past given to this model should not be passed as input_ids as
they have already been computed.
use_mems has to be set to True to make use of mems.
perm_mask (torch.FloatTensor of shape (batch_size, sequence_length, sequence_length), optional) —
Mask to indicate the attention pattern for each input token with values selected in [0, 1]:
if perm_mask[k, i, j] = 0, i attend to j in batch k;
if perm_mask[k, i, j] = 1, i does not attend to j in batch k.
If not set, each token attends to all the others (full bidirectional attention). Only used during
pretraining (to define factorization order) or for sequential decoding (generation).
target_mapping (torch.FloatTensor of shape (batch_size, num_predict, sequence_length), optional) —
Mask to indicate the output tokens to use. If target_mapping[k, i, j] = 1, the i-th predict in batch k is
on the j-th token. Only used during pretraining for partial prediction or for sequential decoding
(generation).
token_type_ids (torch.LongTensor of shape (batch_size, sequence_length), optional) —
Segment token indices to indicate first and second portions of the inputs. Indices are selected in [0, 1]:
0 corresponds to a sentence A token,
1 corresponds to a sentence B token.
What are token type IDs?
input_mask (torch.FloatTensor of shape batch_size, sequence_length, optional) —
Mask to avoid performing attention on padding token indices. Negative of attention_mask, i.e. with 0 for
real tokens and 1 for padding which is kept for compatibility with the original code base.
Mask values selected in [0, 1]:
1 for tokens that are masked,
0 for tokens that are not masked.
You can only uses one of input_mask and attention_mask.
head_mask (torch.FloatTensor of shape (num_heads,) or (num_layers, num_heads), optional) —
Mask to nullify selected heads of the self-attention modules. Mask values selected in [0, 1]:
1 indicates the head is not masked,
0 indicates the head is masked.
inputs_embeds (torch.FloatTensor of shape (batch_size, sequence_length, hidden_size), optional) —
Optionally, instead of passing input_ids you can choose to directly pass an embedded representation. This
is useful if you want more control over how to convert input_ids indices into associated vectors than the
model’s internal embedding lookup matrix.
output_attentions (bool, optional) —
Whether or not to return the attentions tensors of all attention layers. See attentions under returned
tensors for more detail.
output_hidden_states (bool, optional) —
Whether or not to return the hidden states of all layers. See hidden_states under returned tensors for
more detail.
return_dict (bool, optional) —
Whether or not to return a ModelOutput instead of a plain tuple.
labels (torch.LongTensor of shape (batch_size,), optional) —
Labels for computing the sequence classification/regression loss. Indices should be in [0, ..., config.num_labels - 1]. If config.num_labels == 1 a regression loss is computed (Mean-Square loss), If
config.num_labels > 1 a classification loss is computed (Cross-Entropy).
Returns
transformers.models.xlnet.modeling_xlnet.XLNetForSequenceClassificationOutput or tuple(torch.FloatTensor)
A transformers.models.xlnet.modeling_xlnet.XLNetForSequenceClassificationOutput or a tuple of
torch.FloatTensor (if return_dict=False is passed or when config.return_dict=False) comprising various
elements depending on the configuration (XLNetConfig) and inputs.
loss (torch.FloatTensor of shape (1,), optional, returned when label is provided) — Classification (or regression if config.num_labels==1) loss.
logits (torch.FloatTensor of shape (batch_size, config.num_labels)) — Classification (or regression if config.num_labels==1) scores (before SoftMax).
mems (List[torch.FloatTensor] of length config.n_layers) — Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(torch.FloatTensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) — Tuple of torch.FloatTensor (one for the output of the embeddings + one for the output of each layer) of
shape (batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(torch.FloatTensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) — Tuple of torch.FloatTensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
The XLNetForSequenceClassification forward method, overrides the __call__ special method.
Although the recipe for forward pass needs to be defined within this function, one should call the Module
instance afterwards instead of this since the former takes care of running the pre and post processing steps while
the latter silently ignores them.
Example of single-label classification:
	Copied
 import torch
 from transformers import AutoTokenizer, XLNetForSequenceClassification
 tokenizer = AutoTokenizer.from_pretrained("xlnet-base-cased")
 model = XLNetForSequenceClassification.from_pretrained("xlnet-base-cased")
 inputs = tokenizer("Hello, my dog is cute", return_tensors="pt")
 with torch.no_grad():
...     logits = model(**inputs).logits
 predicted_class_id = logits.argmax().item()
 # To train a model on `num_labels` classes, you can pass `num_labels=num_labels` to `.from_pretrained(...)`
 num_labels = len(model.config.id2label)
 model = XLNetForSequenceClassification.from_pretrained("xlnet-base-cased", num_labels=num_labels)
 labels = torch.tensor([1])
 loss = model(**inputs, labels=labels).loss
Example of multi-label classification:
	Copied
 import torch
 from transformers import AutoTokenizer, XLNetForSequenceClassification
 tokenizer = AutoTokenizer.from_pretrained("xlnet-base-cased")
 model = XLNetForSequenceClassification.from_pretrained("xlnet-base-cased", problem_type="multi_label_classification")
 inputs = tokenizer("Hello, my dog is cute", return_tensors="pt")
 with torch.no_grad():
...     logits = model(**inputs).logits
 predicted_class_ids = torch.arange(0, logits.shape[-1])[torch.sigmoid(logits).squeeze(dim=0) > 0.5]
 # To train a model on `num_labels` classes, you can pass `num_labels=num_labels` to `.from_pretrained(...)`
 num_labels = len(model.config.id2label)
 model = XLNetForSequenceClassification.from_pretrained(
...     "xlnet-base-cased", num_labels=num_labels, problem_type="multi_label_classification"
... )
 labels = torch.sum(
...     torch.nn.functional.one_hot(predicted_class_ids[None, :].clone(), num_classes=num_labels), dim=1
... ).to(torch.float)
 loss = model(**inputs, labels=labels).loss
XLNetForMultipleChoice
	
class transformers.XLNetForMultipleChoice
<
source
>
(
config
)
Parameters 
config (XLNetConfig) — Model configuration class with all the parameters of the model.
Initializing with a config file does not load the weights associated with the model, only the
configuration. Check out the from_pretrained() method to load the model weights.
XLNet Model with a multiple choice classification head on top (a linear layer on top of the pooled output and a
softmax) e.g. for RACE/SWAG tasks.
This model inherits from PreTrainedModel. Check the superclass documentation for the generic methods the
library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads
etc.)
This model is also a PyTorch torch.nn.Module subclass.
Use it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general usage
and behavior.
forward
<
source
>
(
input_ids: typing.Optional[torch.Tensor] = None
token_type_ids: typing.Optional[torch.Tensor] = None
input_mask: typing.Optional[torch.Tensor] = None
attention_mask: typing.Optional[torch.Tensor] = None
mems: typing.Optional[torch.Tensor] = None
perm_mask: typing.Optional[torch.Tensor] = None
target_mapping: typing.Optional[torch.Tensor] = None
head_mask: typing.Optional[torch.Tensor] = None
inputs_embeds: typing.Optional[torch.Tensor] = None
labels: typing.Optional[torch.Tensor] = None
use_mems: typing.Optional[bool] = None
output_attentions: typing.Optional[bool] = None
output_hidden_states: typing.Optional[bool] = None
return_dict: typing.Optional[bool] = None
**kwargs
)
→
transformers.models.xlnet.modeling_xlnet.XLNetForMultipleChoiceOutput or tuple(torch.FloatTensor)
Parameters 
input_ids (torch.LongTensor of shape (batch_size, num_choices, sequence_length)) —
Indices of input sequence tokens in the vocabulary.
Indices can be obtained using AutoTokenizer. See PreTrainedTokenizer.encode() and
PreTrainedTokenizer.call() for details.
What are input IDs?
attention_mask (torch.FloatTensor of shape (batch_size, num_choices, sequence_length), optional) —
Mask to avoid performing attention on padding token indices. Mask values selected in [0, 1]:
1 for tokens that are not masked,
0 for tokens that are masked.
What are attention masks?
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states (see mems output below) . Can be used to speed up sequential
decoding. The token ids which have their past given to this model should not be passed as input_ids as
they have already been computed.
use_mems has to be set to True to make use of mems.
perm_mask (torch.FloatTensor of shape (batch_size, sequence_length, sequence_length), optional) —
Mask to indicate the attention pattern for each input token with values selected in [0, 1]:
if perm_mask[k, i, j] = 0, i attend to j in batch k;
if perm_mask[k, i, j] = 1, i does not attend to j in batch k.
If not set, each token attends to all the others (full bidirectional attention). Only used during
pretraining (to define factorization order) or for sequential decoding (generation).
target_mapping (torch.FloatTensor of shape (batch_size, num_predict, sequence_length), optional) —
Mask to indicate the output tokens to use. If target_mapping[k, i, j] = 1, the i-th predict in batch k is
on the j-th token. Only used during pretraining for partial prediction or for sequential decoding
(generation).
token_type_ids (torch.LongTensor of shape (batch_size, num_choices, sequence_length), optional) —
Segment token indices to indicate first and second portions of the inputs. Indices are selected in [0, 1]:
0 corresponds to a sentence A token,
1 corresponds to a sentence B token.
What are token type IDs?
input_mask (torch.FloatTensor of shape batch_size, num_choices, sequence_length, optional) —
Mask to avoid performing attention on padding token indices. Negative of attention_mask, i.e. with 0 for
real tokens and 1 for padding which is kept for compatibility with the original code base.
Mask values selected in [0, 1]:
1 for tokens that are masked,
0 for tokens that are not masked.
You can only uses one of input_mask and attention_mask.
head_mask (torch.FloatTensor of shape (num_heads,) or (num_layers, num_heads), optional) —
Mask to nullify selected heads of the self-attention modules. Mask values selected in [0, 1]:
1 indicates the head is not masked,
0 indicates the head is masked.
inputs_embeds (torch.FloatTensor of shape (batch_size, num_choices, sequence_length, hidden_size), optional) —
Optionally, instead of passing input_ids you can choose to directly pass an embedded representation. This
is useful if you want more control over how to convert input_ids indices into associated vectors than the
model’s internal embedding lookup matrix.
output_attentions (bool, optional) —
Whether or not to return the attentions tensors of all attention layers. See attentions under returned
tensors for more detail.
output_hidden_states (bool, optional) —
Whether or not to return the hidden states of all layers. See hidden_states under returned tensors for
more detail.
return_dict (bool, optional) —
Whether or not to return a ModelOutput instead of a plain tuple.
labels (torch.LongTensor of shape (batch_size,), optional) —
Labels for computing the multiple choice classification loss. Indices should be in [0, ..., num_choices-1] where num_choices is the size of the second dimension of the input tensors. (See
input_ids above)
Returns
transformers.models.xlnet.modeling_xlnet.XLNetForMultipleChoiceOutput or tuple(torch.FloatTensor)
A transformers.models.xlnet.modeling_xlnet.XLNetForMultipleChoiceOutput or a tuple of
torch.FloatTensor (if return_dict=False is passed or when config.return_dict=False) comprising various
elements depending on the configuration (XLNetConfig) and inputs.
loss (torch.FloatTensor of shape (1,), optional, returned when labels is provided) — Classification loss.
logits (torch.FloatTensor of shape (batch_size, num_choices)) — num_choices is the second dimension of the input tensors. (see input_ids above).
Classification scores (before SoftMax).
mems (List[torch.FloatTensor] of length config.n_layers) — Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(torch.FloatTensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) — Tuple of torch.FloatTensor (one for the output of the embeddings + one for the output of each layer) of
shape (batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(torch.FloatTensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) — Tuple of torch.FloatTensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
The XLNetForMultipleChoice forward method, overrides the __call__ special method.
Although the recipe for forward pass needs to be defined within this function, one should call the Module
instance afterwards instead of this since the former takes care of running the pre and post processing steps while
the latter silently ignores them.
Example:
	Copied
 from transformers import AutoTokenizer, XLNetForMultipleChoice
 import torch
 tokenizer = AutoTokenizer.from_pretrained("xlnet-base-cased")
 model = XLNetForMultipleChoice.from_pretrained("xlnet-base-cased")
 prompt = "In Italy, pizza served in formal settings, such as at a restaurant, is presented unsliced."
 choice0 = "It is eaten with a fork and a knife."
 choice1 = "It is eaten while held in the hand."
 labels = torch.tensor(0).unsqueeze(0)  # choice0 is correct (according to Wikipedia ;)), batch size 1
 encoding = tokenizer([prompt, prompt], [choice0, choice1], return_tensors="pt", padding=True)
 outputs = model(**{k: v.unsqueeze(0) for k, v in encoding.items()}, labels=labels)  # batch size is 1
 # the linear classifier still needs to be trained
 loss = outputs.loss
 logits = outputs.logits
XLNetForTokenClassification
	
class transformers.XLNetForTokenClassification
<
source
>
(
config
)
Parameters 
config (XLNetConfig) — Model configuration class with all the parameters of the model.
Initializing with a config file does not load the weights associated with the model, only the
configuration. Check out the from_pretrained() method to load the model weights.
XLNet Model with a token classification head on top (a linear layer on top of the hidden-states output) e.g. for
Named-Entity-Recognition (NER) tasks.
This model inherits from PreTrainedModel. Check the superclass documentation for the generic methods the
library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads
etc.)
This model is also a PyTorch torch.nn.Module subclass.
Use it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general usage
and behavior.
forward
<
source
>
(
input_ids: typing.Optional[torch.Tensor] = None
attention_mask: typing.Optional[torch.Tensor] = None
mems: typing.Optional[torch.Tensor] = None
perm_mask: typing.Optional[torch.Tensor] = None
target_mapping: typing.Optional[torch.Tensor] = None
token_type_ids: typing.Optional[torch.Tensor] = None
input_mask: typing.Optional[torch.Tensor] = None
head_mask: typing.Optional[torch.Tensor] = None
inputs_embeds: typing.Optional[torch.Tensor] = None
labels: typing.Optional[torch.Tensor] = None
use_mems: typing.Optional[bool] = None
output_attentions: typing.Optional[bool] = None
output_hidden_states: typing.Optional[bool] = None
return_dict: typing.Optional[bool] = None
**kwargs
)
→
transformers.models.xlnet.modeling_xlnet.XLNetForTokenClassificationOutput or tuple(torch.FloatTensor)
Parameters 
input_ids (torch.LongTensor of shape (batch_size, sequence_length)) —
Indices of input sequence tokens in the vocabulary.
Indices can be obtained using AutoTokenizer. See PreTrainedTokenizer.encode() and
PreTrainedTokenizer.call() for details.
What are input IDs?
attention_mask (torch.FloatTensor of shape (batch_size, sequence_length), optional) —
Mask to avoid performing attention on padding token indices. Mask values selected in [0, 1]:
1 for tokens that are not masked,
0 for tokens that are masked.
What are attention masks?
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states (see mems output below) . Can be used to speed up sequential
decoding. The token ids which have their past given to this model should not be passed as input_ids as
they have already been computed.
use_mems has to be set to True to make use of mems.
perm_mask (torch.FloatTensor of shape (batch_size, sequence_length, sequence_length), optional) —
Mask to indicate the attention pattern for each input token with values selected in [0, 1]:
if perm_mask[k, i, j] = 0, i attend to j in batch k;
if perm_mask[k, i, j] = 1, i does not attend to j in batch k.
If not set, each token attends to all the others (full bidirectional attention). Only used during
pretraining (to define factorization order) or for sequential decoding (generation).
target_mapping (torch.FloatTensor of shape (batch_size, num_predict, sequence_length), optional) —
Mask to indicate the output tokens to use. If target_mapping[k, i, j] = 1, the i-th predict in batch k is
on the j-th token. Only used during pretraining for partial prediction or for sequential decoding
(generation).
token_type_ids (torch.LongTensor of shape (batch_size, sequence_length), optional) —
Segment token indices to indicate first and second portions of the inputs. Indices are selected in [0, 1]:
0 corresponds to a sentence A token,
1 corresponds to a sentence B token.
What are token type IDs?
input_mask (torch.FloatTensor of shape batch_size, sequence_length, optional) —
Mask to avoid performing attention on padding token indices. Negative of attention_mask, i.e. with 0 for
real tokens and 1 for padding which is kept for compatibility with the original code base.
Mask values selected in [0, 1]:
1 for tokens that are masked,
0 for tokens that are not masked.
You can only uses one of input_mask and attention_mask.
head_mask (torch.FloatTensor of shape (num_heads,) or (num_layers, num_heads), optional) —
Mask to nullify selected heads of the self-attention modules. Mask values selected in [0, 1]:
1 indicates the head is not masked,
0 indicates the head is masked.
inputs_embeds (torch.FloatTensor of shape (batch_size, sequence_length, hidden_size), optional) —
Optionally, instead of passing input_ids you can choose to directly pass an embedded representation. This
is useful if you want more control over how to convert input_ids indices into associated vectors than the
model’s internal embedding lookup matrix.
output_attentions (bool, optional) —
Whether or not to return the attentions tensors of all attention layers. See attentions under returned
tensors for more detail.
output_hidden_states (bool, optional) —
Whether or not to return the hidden states of all layers. See hidden_states under returned tensors for
more detail.
return_dict (bool, optional) —
Whether or not to return a ModelOutput instead of a plain tuple.
labels (torch.LongTensor of shape (batch_size,), optional) —
Labels for computing the multiple choice classification loss. Indices should be in [0, ..., num_choices]
where num_choices is the size of the second dimension of the input tensors. (see input_ids above)
Returns
transformers.models.xlnet.modeling_xlnet.XLNetForTokenClassificationOutput or tuple(torch.FloatTensor)
A transformers.models.xlnet.modeling_xlnet.XLNetForTokenClassificationOutput or a tuple of
torch.FloatTensor (if return_dict=False is passed or when config.return_dict=False) comprising various
elements depending on the configuration (XLNetConfig) and inputs.
loss (torch.FloatTensor of shape (1,), optional, returned when labels is provided)  — Classification loss.
logits (torch.FloatTensor of shape (batch_size, sequence_length, config.num_labels)) — Classification scores (before SoftMax).
mems (List[torch.FloatTensor] of length config.n_layers) — Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(torch.FloatTensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) — Tuple of torch.FloatTensor (one for the output of the embeddings + one for the output of each layer) of
shape (batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(torch.FloatTensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) — Tuple of torch.FloatTensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
The XLNetForTokenClassification forward method, overrides the __call__ special method.
Although the recipe for forward pass needs to be defined within this function, one should call the Module
instance afterwards instead of this since the former takes care of running the pre and post processing steps while
the latter silently ignores them.
Example:
	Copied
 from transformers import AutoTokenizer, XLNetForTokenClassification
 import torch
 tokenizer = AutoTokenizer.from_pretrained("xlnet-base-cased")
 model = XLNetForTokenClassification.from_pretrained("xlnet-base-cased")
 inputs = tokenizer(
...     "HuggingFace is a company based in Paris and New York", add_special_tokens=False, return_tensors="pt"
... )
 with torch.no_grad():
...     logits = model(**inputs).logits
 predicted_token_class_ids = logits.argmax(-1)
 # Note that tokens are classified rather then input words which means that
 # there might be more predicted token classes than words.
 # Multiple token classes might account for the same word
 predicted_tokens_classes = [model.config.id2label[t.item()] for t in predicted_token_class_ids[0]]
 labels = predicted_token_class_ids
 loss = model(**inputs, labels=labels).loss
XLNetForQuestionAnsweringSimple
	
class transformers.XLNetForQuestionAnsweringSimple
<
source
>
(
config
)
Parameters 
config (XLNetConfig) — Model configuration class with all the parameters of the model.
Initializing with a config file does not load the weights associated with the model, only the
configuration. Check out the from_pretrained() method to load the model weights.
XLNet Model with a span classification head on top for extractive question-answering tasks like SQuAD (a linear
layers on top of the hidden-states output to compute span start logits and span end logits).
This model inherits from PreTrainedModel. Check the superclass documentation for the generic methods the
library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads
etc.)
This model is also a PyTorch torch.nn.Module subclass.
Use it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general usage
and behavior.
forward
<
source
>
(
input_ids: typing.Optional[torch.Tensor] = None
attention_mask: typing.Optional[torch.Tensor] = None
mems: typing.Optional[torch.Tensor] = None
perm_mask: typing.Optional[torch.Tensor] = None
target_mapping: typing.Optional[torch.Tensor] = None
token_type_ids: typing.Optional[torch.Tensor] = None
input_mask: typing.Optional[torch.Tensor] = None
head_mask: typing.Optional[torch.Tensor] = None
inputs_embeds: typing.Optional[torch.Tensor] = None
start_positions: typing.Optional[torch.Tensor] = None
end_positions: typing.Optional[torch.Tensor] = None
use_mems: typing.Optional[bool] = None
output_attentions: typing.Optional[bool] = None
output_hidden_states: typing.Optional[bool] = None
return_dict: typing.Optional[bool] = None
**kwargs
)
→
transformers.models.xlnet.modeling_xlnet.XLNetForQuestionAnsweringSimpleOutput or tuple(torch.FloatTensor)
Parameters 
input_ids (torch.LongTensor of shape (batch_size, sequence_length)) —
Indices of input sequence tokens in the vocabulary.
Indices can be obtained using AutoTokenizer. See PreTrainedTokenizer.encode() and
PreTrainedTokenizer.call() for details.
What are input IDs?
attention_mask (torch.FloatTensor of shape (batch_size, sequence_length), optional) —
Mask to avoid performing attention on padding token indices. Mask values selected in [0, 1]:
1 for tokens that are not masked,
0 for tokens that are masked.
What are attention masks?
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states (see mems output below) . Can be used to speed up sequential
decoding. The token ids which have their past given to this model should not be passed as input_ids as
they have already been computed.
use_mems has to be set to True to make use of mems.
perm_mask (torch.FloatTensor of shape (batch_size, sequence_length, sequence_length), optional) —
Mask to indicate the attention pattern for each input token with values selected in [0, 1]:
if perm_mask[k, i, j] = 0, i attend to j in batch k;
if perm_mask[k, i, j] = 1, i does not attend to j in batch k.
If not set, each token attends to all the others (full bidirectional attention). Only used during
pretraining (to define factorization order) or for sequential decoding (generation).
target_mapping (torch.FloatTensor of shape (batch_size, num_predict, sequence_length), optional) —
Mask to indicate the output tokens to use. If target_mapping[k, i, j] = 1, the i-th predict in batch k is
on the j-th token. Only used during pretraining for partial prediction or for sequential decoding
(generation).
token_type_ids (torch.LongTensor of shape (batch_size, sequence_length), optional) —
Segment token indices to indicate first and second portions of the inputs. Indices are selected in [0, 1]:
0 corresponds to a sentence A token,
1 corresponds to a sentence B token.
What are token type IDs?
input_mask (torch.FloatTensor of shape batch_size, sequence_length, optional) —
Mask to avoid performing attention on padding token indices. Negative of attention_mask, i.e. with 0 for
real tokens and 1 for padding which is kept for compatibility with the original code base.
Mask values selected in [0, 1]:
1 for tokens that are masked,
0 for tokens that are not masked.
You can only uses one of input_mask and attention_mask.
head_mask (torch.FloatTensor of shape (num_heads,) or (num_layers, num_heads), optional) —
Mask to nullify selected heads of the self-attention modules. Mask values selected in [0, 1]:
1 indicates the head is not masked,
0 indicates the head is masked.
inputs_embeds (torch.FloatTensor of shape (batch_size, sequence_length, hidden_size), optional) —
Optionally, instead of passing input_ids you can choose to directly pass an embedded representation. This
is useful if you want more control over how to convert input_ids indices into associated vectors than the
model’s internal embedding lookup matrix.
output_attentions (bool, optional) —
Whether or not to return the attentions tensors of all attention layers. See attentions under returned
tensors for more detail.
output_hidden_states (bool, optional) —
Whether or not to return the hidden states of all layers. See hidden_states under returned tensors for
more detail.
return_dict (bool, optional) —
Whether or not to return a ModelOutput instead of a plain tuple.
start_positions (torch.LongTensor of shape (batch_size,), optional) —
Labels for position (index) of the start of the labelled span for computing the token classification loss.
Positions are clamped to the length of the sequence (sequence_length). Position outside of the sequence
are not taken into account for computing the loss.
end_positions (torch.LongTensor of shape (batch_size,), optional) —
Labels for position (index) of the end of the labelled span for computing the token classification loss.
Positions are clamped to the length of the sequence (sequence_length). Position outside of the sequence
are not taken into account for computing the loss.
Returns
transformers.models.xlnet.modeling_xlnet.XLNetForQuestionAnsweringSimpleOutput or tuple(torch.FloatTensor)
A transformers.models.xlnet.modeling_xlnet.XLNetForQuestionAnsweringSimpleOutput or a tuple of
torch.FloatTensor (if return_dict=False is passed or when config.return_dict=False) comprising various
elements depending on the configuration (XLNetConfig) and inputs.
loss (torch.FloatTensor of shape (1,), optional, returned when labels is provided) — Total span extraction loss is the sum of a Cross-Entropy for the start and end positions.
start_logits (torch.FloatTensor of shape (batch_size, sequence_length,)) — Span-start scores (before SoftMax).
end_logits (torch.FloatTensor of shape (batch_size, sequence_length,)) — Span-end scores (before SoftMax).
mems (List[torch.FloatTensor] of length config.n_layers) — Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(torch.FloatTensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) — Tuple of torch.FloatTensor (one for the output of the embeddings + one for the output of each layer) of
shape (batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(torch.FloatTensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) — Tuple of torch.FloatTensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
The XLNetForQuestionAnsweringSimple forward method, overrides the __call__ special method.
Although the recipe for forward pass needs to be defined within this function, one should call the Module
instance afterwards instead of this since the former takes care of running the pre and post processing steps while
the latter silently ignores them.
Example:
	Copied
 from transformers import AutoTokenizer, XLNetForQuestionAnsweringSimple
 import torch
 tokenizer = AutoTokenizer.from_pretrained("xlnet-base-cased")
 model = XLNetForQuestionAnsweringSimple.from_pretrained("xlnet-base-cased")
 question, text = "Who was Jim Henson?", "Jim Henson was a nice puppet"
 inputs = tokenizer(question, text, return_tensors="pt")
 with torch.no_grad():
...     outputs = model(**inputs)
 answer_start_index = outputs.start_logits.argmax()
 answer_end_index = outputs.end_logits.argmax()
 predict_answer_tokens = inputs.input_ids[0, answer_start_index : answer_end_index + 1]
 # target is "nice puppet"
 target_start_index = torch.tensor([14])
 target_end_index = torch.tensor([15])
 outputs = model(**inputs, start_positions=target_start_index, end_positions=target_end_index)
 loss = outputs.loss
XLNetForQuestionAnswering
	
class transformers.XLNetForQuestionAnswering
<
source
>
(
config
)
Parameters 
config (XLNetConfig) — Model configuration class with all the parameters of the model.
Initializing with a config file does not load the weights associated with the model, only the
configuration. Check out the from_pretrained() method to load the model weights.
XLNet Model with a span classification head on top for extractive question-answering tasks like SQuAD (a linear
layers on top of the hidden-states output to compute span start logits and span end logits).
This model inherits from PreTrainedModel. Check the superclass documentation for the generic methods the
library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads
etc.)
This model is also a PyTorch torch.nn.Module subclass.
Use it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general usage
and behavior.
forward
<
source
>
(
input_ids: typing.Optional[torch.Tensor] = None
attention_mask: typing.Optional[torch.Tensor] = None
mems: typing.Optional[torch.Tensor] = None
perm_mask: typing.Optional[torch.Tensor] = None
target_mapping: typing.Optional[torch.Tensor] = None
token_type_ids: typing.Optional[torch.Tensor] = None
input_mask: typing.Optional[torch.Tensor] = None
head_mask: typing.Optional[torch.Tensor] = None
inputs_embeds: typing.Optional[torch.Tensor] = None
start_positions: typing.Optional[torch.Tensor] = None
end_positions: typing.Optional[torch.Tensor] = None
is_impossible: typing.Optional[torch.Tensor] = None
cls_index: typing.Optional[torch.Tensor] = None
p_mask: typing.Optional[torch.Tensor] = None
use_mems: typing.Optional[bool] = None
output_attentions: typing.Optional[bool] = None
output_hidden_states: typing.Optional[bool] = None
return_dict: typing.Optional[bool] = None
**kwargs
)
→
transformers.models.xlnet.modeling_xlnet.XLNetForQuestionAnsweringOutput or tuple(torch.FloatTensor)
Parameters 
input_ids (torch.LongTensor of shape (batch_size, sequence_length)) —
Indices of input sequence tokens in the vocabulary.
Indices can be obtained using AutoTokenizer. See PreTrainedTokenizer.encode() and
PreTrainedTokenizer.call() for details.
What are input IDs?
attention_mask (torch.FloatTensor of shape (batch_size, sequence_length), optional) —
Mask to avoid performing attention on padding token indices. Mask values selected in [0, 1]:
1 for tokens that are not masked,
0 for tokens that are masked.
What are attention masks?
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states (see mems output below) . Can be used to speed up sequential
decoding. The token ids which have their past given to this model should not be passed as input_ids as
they have already been computed.
use_mems has to be set to True to make use of mems.
perm_mask (torch.FloatTensor of shape (batch_size, sequence_length, sequence_length), optional) —
Mask to indicate the attention pattern for each input token with values selected in [0, 1]:
if perm_mask[k, i, j] = 0, i attend to j in batch k;
if perm_mask[k, i, j] = 1, i does not attend to j in batch k.
If not set, each token attends to all the others (full bidirectional attention). Only used during
pretraining (to define factorization order) or for sequential decoding (generation).
target_mapping (torch.FloatTensor of shape (batch_size, num_predict, sequence_length), optional) —
Mask to indicate the output tokens to use. If target_mapping[k, i, j] = 1, the i-th predict in batch k is
on the j-th token. Only used during pretraining for partial prediction or for sequential decoding
(generation).
token_type_ids (torch.LongTensor of shape (batch_size, sequence_length), optional) —
Segment token indices to indicate first and second portions of the inputs. Indices are selected in [0, 1]:
0 corresponds to a sentence A token,
1 corresponds to a sentence B token.
What are token type IDs?
input_mask (torch.FloatTensor of shape batch_size, sequence_length, optional) —
Mask to avoid performing attention on padding token indices. Negative of attention_mask, i.e. with 0 for
real tokens and 1 for padding which is kept for compatibility with the original code base.
Mask values selected in [0, 1]:
1 for tokens that are masked,
0 for tokens that are not masked.
You can only uses one of input_mask and attention_mask.
head_mask (torch.FloatTensor of shape (num_heads,) or (num_layers, num_heads), optional) —
Mask to nullify selected heads of the self-attention modules. Mask values selected in [0, 1]:
1 indicates the head is not masked,
0 indicates the head is masked.
inputs_embeds (torch.FloatTensor of shape (batch_size, sequence_length, hidden_size), optional) —
Optionally, instead of passing input_ids you can choose to directly pass an embedded representation. This
is useful if you want more control over how to convert input_ids indices into associated vectors than the
model’s internal embedding lookup matrix.
output_attentions (bool, optional) —
Whether or not to return the attentions tensors of all attention layers. See attentions under returned
tensors for more detail.
output_hidden_states (bool, optional) —
Whether or not to return the hidden states of all layers. See hidden_states under returned tensors for
more detail.
return_dict (bool, optional) —
Whether or not to return a ModelOutput instead of a plain tuple.
start_positions (torch.LongTensor of shape (batch_size,), optional) —
Labels for position (index) of the start of the labelled span for computing the token classification loss.
Positions are clamped to the length of the sequence (sequence_length). Position outside of the sequence
are not taken into account for computing the loss.
end_positions (torch.LongTensor of shape (batch_size,), optional) —
Labels for position (index) of the end of the labelled span for computing the token classification loss.
Positions are clamped to the length of the sequence (sequence_length). Position outside of the sequence
are not taken into account for computing the loss.
is_impossible (torch.LongTensor of shape (batch_size,), optional) —
Labels whether a question has an answer or no answer (SQuAD 2.0)
cls_index (torch.LongTensor of shape (batch_size,), optional) —
Labels for position (index) of the classification token to use as input for computing plausibility of the
answer.
p_mask (torch.FloatTensor of shape (batch_size, sequence_length), optional) —
Optional mask of tokens which can’t be in answers (e.g. [CLS], [PAD], …). 1.0 means token should be
masked. 0.0 mean token is not masked.
Returns
transformers.models.xlnet.modeling_xlnet.XLNetForQuestionAnsweringOutput or tuple(torch.FloatTensor)
A transformers.models.xlnet.modeling_xlnet.XLNetForQuestionAnsweringOutput or a tuple of
torch.FloatTensor (if return_dict=False is passed or when config.return_dict=False) comprising various
elements depending on the configuration (XLNetConfig) and inputs.
loss (torch.FloatTensor of shape (1,), optional, returned if both start_positions and end_positions are provided) — Classification loss as the sum of start token, end token (and is_impossible if provided) classification
losses.
start_top_log_probs (torch.FloatTensor of shape (batch_size, config.start_n_top), optional, returned if start_positions or end_positions is not provided) — Log probabilities for the top config.start_n_top start token possibilities (beam-search).
start_top_index (torch.LongTensor of shape (batch_size, config.start_n_top), optional, returned if start_positions or end_positions is not provided) — Indices for the top config.start_n_top start token possibilities (beam-search).
end_top_log_probs (torch.FloatTensor of shape (batch_size, config.start_n_top * config.end_n_top), optional, returned if start_positions or end_positions is not provided) — Log probabilities for the top config.start_n_top * config.end_n_top end token possibilities
(beam-search).
end_top_index (torch.LongTensor of shape (batch_size, config.start_n_top * config.end_n_top), optional, returned if start_positions or end_positions is not provided) — Indices for the top config.start_n_top * config.end_n_top end token possibilities (beam-search).
cls_logits (torch.FloatTensor of shape (batch_size,), optional, returned if start_positions or end_positions is not provided) — Log probabilities for the is_impossible label of the answers.
mems (List[torch.FloatTensor] of length config.n_layers) — Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(torch.FloatTensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) — Tuple of torch.FloatTensor (one for the output of the embeddings + one for the output of each layer) of
shape (batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(torch.FloatTensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) — Tuple of torch.FloatTensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
The XLNetForQuestionAnswering forward method, overrides the __call__ special method.
Although the recipe for forward pass needs to be defined within this function, one should call the Module
instance afterwards instead of this since the former takes care of running the pre and post processing steps while
the latter silently ignores them.
Example:
	Copied
 from transformers import AutoTokenizer, XLNetForQuestionAnswering
 import torch
 tokenizer = AutoTokenizer.from_pretrained("xlnet-base-cased")
 model = XLNetForQuestionAnswering.from_pretrained("xlnet-base-cased")
 input_ids = torch.tensor(tokenizer.encode("Hello, my dog is cute", add_special_tokens=True)).unsqueeze(
...     0
... )  # Batch size 1
 start_positions = torch.tensor([1])
 end_positions = torch.tensor([3])
 outputs = model(input_ids, start_positions=start_positions, end_positions=end_positions)
 loss = outputs.loss
TFXLNetModel
	
class transformers.TFXLNetModel
<
source
>
(
*args
**kwargs
)
Parameters 
config (XLNetConfig) — Model configuration class with all the parameters of the model.
Initializing with a config file does not load the weights associated with the model, only the
configuration. Check out the from_pretrained() method to load the model weights.
The bare XLNet Model transformer outputting raw hidden-states without any specific head on top.
This model inherits from TFPreTrainedModel. Check the superclass documentation for the generic methods the
library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads
etc.)
This model is also a tf.keras.Model subclass. Use it
as a regular TF 2.0 Keras Model and refer to the TF 2.0 documentation for all matter related to general usage and
behavior.
TensorFlow models and layers in transformers accept two formats as input:
having all inputs as keyword arguments (like PyTorch models), or
having all inputs as a list, tuple or dict in the first positional argument.
The reason the second format is supported is that Keras methods prefer this format when passing inputs to models
and layers. Because of this support, when using methods like model.fit() things should “just work” for you - just
pass your inputs and labels in any format that model.fit() supports! If, however, you want to use the second
format outside of Keras methods like fit() and predict(), such as when creating your own layers or models with
the Keras Functional API, there are three possibilities you can use to gather all the input Tensors in the first
positional argument:
a single Tensor with input_ids only and nothing else: model(input_ids)
a list of varying length with one or several input Tensors IN THE ORDER given in the docstring:
model([input_ids, attention_mask]) or model([input_ids, attention_mask, token_type_ids])
a dictionary with one or several input Tensors associated to the input names given in the docstring:
model({"input_ids": input_ids, "token_type_ids": token_type_ids})
Note that when creating models and layers with
subclassing then you don’t need to worry
about any of this, as you can just pass inputs like you would to any other Python function!
call
<
source
>
(
input_ids: TFModelInputType | None = None
attention_mask: np.ndarray | tf.Tensor | None = None
mems: np.ndarray | tf.Tensor | None = None
perm_mask: np.ndarray | tf.Tensor | None = None
target_mapping: np.ndarray | tf.Tensor | None = None
token_type_ids: np.ndarray | tf.Tensor | None = None
input_mask: np.ndarray | tf.Tensor | None = None
head_mask: np.ndarray | tf.Tensor | None = None
inputs_embeds: np.ndarray | tf.Tensor | None = None
use_mems: Optional[bool] = None
output_attentions: Optional[bool] = None
output_hidden_states: Optional[bool] = None
return_dict: Optional[bool] = None
training: bool = False
)
→
transformers.models.xlnet.modeling_tf_xlnet.TFXLNetModelOutput or tuple(tf.Tensor)
Parameters 
input_ids (torch.LongTensor of shape (batch_size, sequence_length)) —
Indices of input sequence tokens in the vocabulary.
Indices can be obtained using AutoTokenizer. See PreTrainedTokenizer.encode() and
PreTrainedTokenizer.call() for details.
What are input IDs?
attention_mask (torch.FloatTensor of shape (batch_size, sequence_length), optional) —
Mask to avoid performing attention on padding token indices. Mask values selected in [0, 1]:
1 for tokens that are not masked,
0 for tokens that are masked.
What are attention masks?
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states (see mems output below) . Can be used to speed up sequential
decoding. The token ids which have their past given to this model should not be passed as input_ids as
they have already been computed.
use_mems has to be set to True to make use of mems.
perm_mask (torch.FloatTensor of shape (batch_size, sequence_length, sequence_length), optional) —
Mask to indicate the attention pattern for each input token with values selected in [0, 1]:
if perm_mask[k, i, j] = 0, i attend to j in batch k;
if perm_mask[k, i, j] = 1, i does not attend to j in batch k.
If not set, each token attends to all the others (full bidirectional attention). Only used during
pretraining (to define factorization order) or for sequential decoding (generation).
target_mapping (torch.FloatTensor of shape (batch_size, num_predict, sequence_length), optional) —
Mask to indicate the output tokens to use. If target_mapping[k, i, j] = 1, the i-th predict in batch k is
on the j-th token. Only used during pretraining for partial prediction or for sequential decoding
(generation).
token_type_ids (torch.LongTensor of shape (batch_size, sequence_length), optional) —
Segment token indices to indicate first and second portions of the inputs. Indices are selected in [0, 1]:
0 corresponds to a sentence A token,
1 corresponds to a sentence B token.
What are token type IDs?
input_mask (torch.FloatTensor of shape batch_size, sequence_length, optional) —
Mask to avoid performing attention on padding token indices. Negative of attention_mask, i.e. with 0 for
real tokens and 1 for padding which is kept for compatibility with the original code base.
Mask values selected in [0, 1]:
1 for tokens that are masked,
0 for tokens that are not masked.
You can only uses one of input_mask and attention_mask.
head_mask (torch.FloatTensor of shape (num_heads,) or (num_layers, num_heads), optional) —
Mask to nullify selected heads of the self-attention modules. Mask values selected in [0, 1]:
1 indicates the head is not masked,
0 indicates the head is masked.
inputs_embeds (torch.FloatTensor of shape (batch_size, sequence_length, hidden_size), optional) —
Optionally, instead of passing input_ids you can choose to directly pass an embedded representation. This
is useful if you want more control over how to convert input_ids indices into associated vectors than the
model’s internal embedding lookup matrix.
output_attentions (bool, optional) —
Whether or not to return the attentions tensors of all attention layers. See attentions under returned
tensors for more detail.
output_hidden_states (bool, optional) —
Whether or not to return the hidden states of all layers. See hidden_states under returned tensors for
more detail.
return_dict (bool, optional) —
Whether or not to return a ModelOutput instead of a plain tuple.
Returns
transformers.models.xlnet.modeling_tf_xlnet.TFXLNetModelOutput or tuple(tf.Tensor)
A transformers.models.xlnet.modeling_tf_xlnet.TFXLNetModelOutput or a tuple of tf.Tensor (if
return_dict=False is passed or when config.return_dict=False) comprising various elements depending on the
configuration (XLNetConfig) and inputs.
last_hidden_state (tf.Tensor of shape (batch_size, num_predict, hidden_size)) — Sequence of hidden-states at the last layer of the model.
num_predict corresponds to target_mapping.shape[1]. If target_mapping is None, then num_predict
corresponds to sequence_length.
mems (List[tf.Tensor] of length config.n_layers) — Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(tf.Tensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) — Tuple of tf.Tensor (one for the output of the embeddings + one for the output of each layer) of shape
(batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(tf.Tensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) — Tuple of tf.Tensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
The TFXLNetModel forward method, overrides the __call__ special method.
Although the recipe for forward pass needs to be defined within this function, one should call the Module
instance afterwards instead of this since the former takes care of running the pre and post processing steps while
the latter silently ignores them.
Example:
	Copied
 from transformers import AutoTokenizer, TFXLNetModel
 import tensorflow as tf
 tokenizer = AutoTokenizer.from_pretrained("xlnet-base-cased")
 model = TFXLNetModel.from_pretrained("xlnet-base-cased")
 inputs = tokenizer("Hello, my dog is cute", return_tensors="tf")
 outputs = model(inputs)
 last_hidden_states = outputs.last_hidden_state
TFXLNetLMHeadModel
	
class transformers.TFXLNetLMHeadModel
<
source
>
(
*args
**kwargs
)
Parameters 
config (XLNetConfig) — Model configuration class with all the parameters of the model.
Initializing with a config file does not load the weights associated with the model, only the
configuration. Check out the from_pretrained() method to load the model weights.
XLNet Model with a language modeling head on top (linear layer with weights tied to the input embeddings).
This model inherits from TFPreTrainedModel. Check the superclass documentation for the generic methods the
library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads
etc.)
This model is also a tf.keras.Model subclass. Use it
as a regular TF 2.0 Keras Model and refer to the TF 2.0 documentation for all matter related to general usage and
behavior.
TensorFlow models and layers in transformers accept two formats as input:
having all inputs as keyword arguments (like PyTorch models), or
having all inputs as a list, tuple or dict in the first positional argument.
The reason the second format is supported is that Keras methods prefer this format when passing inputs to models
and layers. Because of this support, when using methods like model.fit() things should “just work” for you - just
pass your inputs and labels in any format that model.fit() supports! If, however, you want to use the second
format outside of Keras methods like fit() and predict(), such as when creating your own layers or models with
the Keras Functional API, there are three possibilities you can use to gather all the input Tensors in the first
positional argument:
a single Tensor with input_ids only and nothing else: model(input_ids)
a list of varying length with one or several input Tensors IN THE ORDER given in the docstring:
model([input_ids, attention_mask]) or model([input_ids, attention_mask, token_type_ids])
a dictionary with one or several input Tensors associated to the input names given in the docstring:
model({"input_ids": input_ids, "token_type_ids": token_type_ids})
Note that when creating models and layers with
subclassing then you don’t need to worry
about any of this, as you can just pass inputs like you would to any other Python function!
call
<
source
>
(
input_ids: TFModelInputType | None = None
attention_mask: np.ndarray | tf.Tensor | None = None
mems: np.ndarray | tf.Tensor | None = None
perm_mask: np.ndarray | tf.Tensor | None = None
target_mapping: np.ndarray | tf.Tensor | None = None
token_type_ids: np.ndarray | tf.Tensor | None = None
input_mask: np.ndarray | tf.Tensor | None = None
head_mask: np.ndarray | tf.Tensor | None = None
inputs_embeds: np.ndarray | tf.Tensor | None = None
use_mems: Optional[bool] = None
output_attentions: Optional[bool] = None
output_hidden_states: Optional[bool] = None
return_dict: Optional[bool] = None
labels: np.ndarray | tf.Tensor | None = None
training: bool = False
)
→
transformers.models.xlnet.modeling_tf_xlnet.TFXLNetLMHeadModelOutput or tuple(tf.Tensor)
Parameters 
input_ids (torch.LongTensor of shape (batch_size, sequence_length)) —
Indices of input sequence tokens in the vocabulary.
Indices can be obtained using AutoTokenizer. See PreTrainedTokenizer.encode() and
PreTrainedTokenizer.call() for details.
What are input IDs?
attention_mask (torch.FloatTensor of shape (batch_size, sequence_length), optional) —
Mask to avoid performing attention on padding token indices. Mask values selected in [0, 1]:
1 for tokens that are not masked,
0 for tokens that are masked.
What are attention masks?
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states (see mems output below) . Can be used to speed up sequential
decoding. The token ids which have their past given to this model should not be passed as input_ids as
they have already been computed.
use_mems has to be set to True to make use of mems.
perm_mask (torch.FloatTensor of shape (batch_size, sequence_length, sequence_length), optional) —
Mask to indicate the attention pattern for each input token with values selected in [0, 1]:
if perm_mask[k, i, j] = 0, i attend to j in batch k;
if perm_mask[k, i, j] = 1, i does not attend to j in batch k.
If not set, each token attends to all the others (full bidirectional attention). Only used during
pretraining (to define factorization order) or for sequential decoding (generation).
target_mapping (torch.FloatTensor of shape (batch_size, num_predict, sequence_length), optional) —
Mask to indicate the output tokens to use. If target_mapping[k, i, j] = 1, the i-th predict in batch k is
on the j-th token. Only used during pretraining for partial prediction or for sequential decoding
(generation).
token_type_ids (torch.LongTensor of shape (batch_size, sequence_length), optional) —
Segment token indices to indicate first and second portions of the inputs. Indices are selected in [0, 1]:
0 corresponds to a sentence A token,
1 corresponds to a sentence B token.
What are token type IDs?
input_mask (torch.FloatTensor of shape batch_size, sequence_length, optional) —
Mask to avoid performing attention on padding token indices. Negative of attention_mask, i.e. with 0 for
real tokens and 1 for padding which is kept for compatibility with the original code base.
Mask values selected in [0, 1]:
1 for tokens that are masked,
0 for tokens that are not masked.
You can only uses one of input_mask and attention_mask.
head_mask (torch.FloatTensor of shape (num_heads,) or (num_layers, num_heads), optional) —
Mask to nullify selected heads of the self-attention modules. Mask values selected in [0, 1]:
1 indicates the head is not masked,
0 indicates the head is masked.
inputs_embeds (torch.FloatTensor of shape (batch_size, sequence_length, hidden_size), optional) —
Optionally, instead of passing input_ids you can choose to directly pass an embedded representation. This
is useful if you want more control over how to convert input_ids indices into associated vectors than the
model’s internal embedding lookup matrix.
output_attentions (bool, optional) —
Whether or not to return the attentions tensors of all attention layers. See attentions under returned
tensors for more detail.
output_hidden_states (bool, optional) —
Whether or not to return the hidden states of all layers. See hidden_states under returned tensors for
more detail.
return_dict (bool, optional) —
Whether or not to return a ModelOutput instead of a plain tuple.
labels (tf.Tensor of shape (batch_size, sequence_length), optional) —
Labels for computing the cross entropy classification loss. Indices should be in [0, ..., config.vocab_size - 1].
Returns
transformers.models.xlnet.modeling_tf_xlnet.TFXLNetLMHeadModelOutput or tuple(tf.Tensor)
A transformers.models.xlnet.modeling_tf_xlnet.TFXLNetLMHeadModelOutput or a tuple of tf.Tensor (if
return_dict=False is passed or when config.return_dict=False) comprising various elements depending on the
configuration (XLNetConfig) and inputs.
loss (tf.Tensor of shape (1,), optional, returned when labels is provided)
Language modeling loss (for next-token prediction).
logits (tf.Tensor of shape (batch_size, num_predict, config.vocab_size)) — Prediction scores of the language modeling head (scores for each vocabulary token before SoftMax).
num_predict corresponds to target_mapping.shape[1]. If target_mapping is None, then num_predict
corresponds to sequence_length.
mems (List[tf.Tensor] of length config.n_layers) — Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(tf.Tensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) — Tuple of tf.Tensor (one for the output of the embeddings + one for the output of each layer) of shape
(batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(tf.Tensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) — Tuple of tf.Tensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
The TFXLNetLMHeadModel forward method, overrides the __call__ special method.
Although the recipe for forward pass needs to be defined within this function, one should call the Module
instance afterwards instead of this since the former takes care of running the pre and post processing steps while
the latter silently ignores them.
Examples:
	Copied
 import tensorflow as tf
 import numpy as np
 from transformers import AutoTokenizer, TFXLNetLMHeadModel
 tokenizer = AutoTokenizer.from_pretrained("xlnet-large-cased")
 model = TFXLNetLMHeadModel.from_pretrained("xlnet-large-cased")
 # We show how to setup inputs to predict a next token using a bi-directional context.
 input_ids = tf.constant(tokenizer.encode("Hello, my dog is very <mask>", add_special_tokens=True))[
...     None, :
... ]  # We will predict the masked token
 perm_mask = np.zeros((1, input_ids.shape[1], input_ids.shape[1]))
 perm_mask[:, :, -1] = 1.0  # Previous tokens don't see last token
 target_mapping = np.zeros(
...     (1, 1, input_ids.shape[1])
... )  # Shape [1, 1, seq_length] => let's predict one token
 target_mapping[
...     0, 0, -1
... ] = 1.0  # Our first (and only) prediction will be the last token of the sequence (the masked token)
 outputs = model(
...     input_ids,
...     perm_mask=tf.constant(perm_mask, dtype=tf.float32),
...     target_mapping=tf.constant(target_mapping, dtype=tf.float32),
... )
 next_token_logits = outputs[
...     0
... ]  # Output has shape [target_mapping.size(0), target_mapping.size(1), config.vocab_size]
TFXLNetForSequenceClassification
	
class transformers.TFXLNetForSequenceClassification
<
source
>
(
*args
**kwargs
)
Parameters 
config (XLNetConfig) — Model configuration class with all the parameters of the model.
Initializing with a config file does not load the weights associated with the model, only the
configuration. Check out the from_pretrained() method to load the model weights.
XLNet Model with a sequence classification/regression head on top (a linear layer on top of the pooled output) e.g.
for GLUE tasks.
This model inherits from TFPreTrainedModel. Check the superclass documentation for the generic methods the
library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads
etc.)
This model is also a tf.keras.Model subclass. Use it
as a regular TF 2.0 Keras Model and refer to the TF 2.0 documentation for all matter related to general usage and
behavior.
TensorFlow models and layers in transformers accept two formats as input:
having all inputs as keyword arguments (like PyTorch models), or
having all inputs as a list, tuple or dict in the first positional argument.
The reason the second format is supported is that Keras methods prefer this format when passing inputs to models
and layers. Because of this support, when using methods like model.fit() things should “just work” for you - just
pass your inputs and labels in any format that model.fit() supports! If, however, you want to use the second
format outside of Keras methods like fit() and predict(), such as when creating your own layers or models with
the Keras Functional API, there are three possibilities you can use to gather all the input Tensors in the first
positional argument:
a single Tensor with input_ids only and nothing else: model(input_ids)
a list of varying length with one or several input Tensors IN THE ORDER given in the docstring:
model([input_ids, attention_mask]) or model([input_ids, attention_mask, token_type_ids])
a dictionary with one or several input Tensors associated to the input names given in the docstring:
model({"input_ids": input_ids, "token_type_ids": token_type_ids})
Note that when creating models and layers with
subclassing then you don’t need to worry
about any of this, as you can just pass inputs like you would to any other Python function!
call
<
source
>
(
input_ids: TFModelInputType | None = None
attention_mask: np.ndarray | tf.Tensor | None = None
mems: np.ndarray | tf.Tensor | None = None
perm_mask: np.ndarray | tf.Tensor | None = None
target_mapping: np.ndarray | tf.Tensor | None = None
token_type_ids: np.ndarray | tf.Tensor | None = None
input_mask: np.ndarray | tf.Tensor | None = None
head_mask: np.ndarray | tf.Tensor | None = None
inputs_embeds: np.ndarray | tf.Tensor | None = None
use_mems: Optional[bool] = None
output_attentions: Optional[bool] = None
output_hidden_states: Optional[bool] = None
return_dict: Optional[bool] = None
labels: np.ndarray | tf.Tensor | None = None
training: bool = False
)
→
transformers.models.xlnet.modeling_tf_xlnet.TFXLNetForSequenceClassificationOutput or tuple(tf.Tensor)
Parameters 
input_ids (torch.LongTensor of shape (batch_size, sequence_length)) —
Indices of input sequence tokens in the vocabulary.
Indices can be obtained using AutoTokenizer. See PreTrainedTokenizer.encode() and
PreTrainedTokenizer.call() for details.
What are input IDs?
attention_mask (torch.FloatTensor of shape (batch_size, sequence_length), optional) —
Mask to avoid performing attention on padding token indices. Mask values selected in [0, 1]:
1 for tokens that are not masked,
0 for tokens that are masked.
What are attention masks?
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states (see mems output below) . Can be used to speed up sequential
decoding. The token ids which have their past given to this model should not be passed as input_ids as
they have already been computed.
use_mems has to be set to True to make use of mems.
perm_mask (torch.FloatTensor of shape (batch_size, sequence_length, sequence_length), optional) —
Mask to indicate the attention pattern for each input token with values selected in [0, 1]:
if perm_mask[k, i, j] = 0, i attend to j in batch k;
if perm_mask[k, i, j] = 1, i does not attend to j in batch k.
If not set, each token attends to all the others (full bidirectional attention). Only used during
pretraining (to define factorization order) or for sequential decoding (generation).
target_mapping (torch.FloatTensor of shape (batch_size, num_predict, sequence_length), optional) —
Mask to indicate the output tokens to use. If target_mapping[k, i, j] = 1, the i-th predict in batch k is
on the j-th token. Only used during pretraining for partial prediction or for sequential decoding
(generation).
token_type_ids (torch.LongTensor of shape (batch_size, sequence_length), optional) —
Segment token indices to indicate first and second portions of the inputs. Indices are selected in [0, 1]:
0 corresponds to a sentence A token,
1 corresponds to a sentence B token.
What are token type IDs?
input_mask (torch.FloatTensor of shape batch_size, sequence_length, optional) —
Mask to avoid performing attention on padding token indices. Negative of attention_mask, i.e. with 0 for
real tokens and 1 for padding which is kept for compatibility with the original code base.
Mask values selected in [0, 1]:
1 for tokens that are masked,
0 for tokens that are not masked.
You can only uses one of input_mask and attention_mask.
head_mask (torch.FloatTensor of shape (num_heads,) or (num_layers, num_heads), optional) —
Mask to nullify selected heads of the self-attention modules. Mask values selected in [0, 1]:
1 indicates the head is not masked,
0 indicates the head is masked.
inputs_embeds (torch.FloatTensor of shape (batch_size, sequence_length, hidden_size), optional) —
Optionally, instead of passing input_ids you can choose to directly pass an embedded representation. This
is useful if you want more control over how to convert input_ids indices into associated vectors than the
model’s internal embedding lookup matrix.
output_attentions (bool, optional) —
Whether or not to return the attentions tensors of all attention layers. See attentions under returned
tensors for more detail.
output_hidden_states (bool, optional) —
Whether or not to return the hidden states of all layers. See hidden_states under returned tensors for
more detail.
return_dict (bool, optional) —
Whether or not to return a ModelOutput instead of a plain tuple.
labels (tf.Tensor of shape (batch_size,), optional) —
Labels for computing the sequence classification/regression loss. Indices should be in [0, ..., config.num_labels - 1]. If config.num_labels == 1 a regression loss is computed (Mean-Square loss), If
config.num_labels > 1 a classification loss is computed (Cross-Entropy).
Returns
transformers.models.xlnet.modeling_tf_xlnet.TFXLNetForSequenceClassificationOutput or tuple(tf.Tensor)
A transformers.models.xlnet.modeling_tf_xlnet.TFXLNetForSequenceClassificationOutput or a tuple of tf.Tensor (if
return_dict=False is passed or when config.return_dict=False) comprising various elements depending on the
configuration (XLNetConfig) and inputs.
loss (tf.Tensor of shape (1,), optional, returned when label is provided) — Classification (or regression if config.num_labels==1) loss.
logits (tf.Tensor of shape (batch_size, config.num_labels)) — Classification (or regression if config.num_labels==1) scores (before SoftMax).
mems (List[tf.Tensor] of length config.n_layers) — Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(tf.Tensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) — Tuple of tf.Tensor (one for the output of the embeddings + one for the output of each layer) of shape
(batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(tf.Tensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) — Tuple of tf.Tensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
The TFXLNetForSequenceClassification forward method, overrides the __call__ special method.
Although the recipe for forward pass needs to be defined within this function, one should call the Module
instance afterwards instead of this since the former takes care of running the pre and post processing steps while
the latter silently ignores them.
Example:
	Copied
 from transformers import AutoTokenizer, TFXLNetForSequenceClassification
 import tensorflow as tf
 tokenizer = AutoTokenizer.from_pretrained("xlnet-base-cased")
 model = TFXLNetForSequenceClassification.from_pretrained("xlnet-base-cased")
 inputs = tokenizer("Hello, my dog is cute", return_tensors="tf")
 logits = model(**inputs).logits
 predicted_class_id = int(tf.math.argmax(logits, axis=-1)[0])
	Copied
 # To train a model on `num_labels` classes, you can pass `num_labels=num_labels` to `.from_pretrained(...)`
 num_labels = len(model.config.id2label)
 model = TFXLNetForSequenceClassification.from_pretrained("xlnet-base-cased", num_labels=num_labels)
 labels = tf.constant(1)
 loss = model(**inputs, labels=labels).loss
TFLNetForMultipleChoice
	
class transformers.TFXLNetForMultipleChoice
<
source
>
(
*args
**kwargs
)
Parameters 
config (XLNetConfig) — Model configuration class with all the parameters of the model.
Initializing with a config file does not load the weights associated with the model, only the
configuration. Check out the from_pretrained() method to load the model weights.
XLNET Model with a multiple choice classification head on top (a linear layer on top of the pooled output and a
softmax) e.g. for RocStories/SWAG tasks.
This model inherits from TFPreTrainedModel. Check the superclass documentation for the generic methods the
library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads
etc.)
This model is also a tf.keras.Model subclass. Use it
as a regular TF 2.0 Keras Model and refer to the TF 2.0 documentation for all matter related to general usage and
behavior.
TensorFlow models and layers in transformers accept two formats as input:
having all inputs as keyword arguments (like PyTorch models), or
having all inputs as a list, tuple or dict in the first positional argument.
The reason the second format is supported is that Keras methods prefer this format when passing inputs to models
and layers. Because of this support, when using methods like model.fit() things should “just work” for you - just
pass your inputs and labels in any format that model.fit() supports! If, however, you want to use the second
format outside of Keras methods like fit() and predict(), such as when creating your own layers or models with
the Keras Functional API, there are three possibilities you can use to gather all the input Tensors in the first
positional argument:
a single Tensor with input_ids only and nothing else: model(input_ids)
a list of varying length with one or several input Tensors IN THE ORDER given in the docstring:
model([input_ids, attention_mask]) or model([input_ids, attention_mask, token_type_ids])
a dictionary with one or several input Tensors associated to the input names given in the docstring:
model({"input_ids": input_ids, "token_type_ids": token_type_ids})
Note that when creating models and layers with
subclassing then you don’t need to worry
about any of this, as you can just pass inputs like you would to any other Python function!
call
<
source
>
(
input_ids: TFModelInputType | None = None
token_type_ids: np.ndarray | tf.Tensor | None = None
input_mask: np.ndarray | tf.Tensor | None = None
attention_mask: np.ndarray | tf.Tensor | None = None
mems: np.ndarray | tf.Tensor | None = None
perm_mask: np.ndarray | tf.Tensor | None = None
target_mapping: np.ndarray | tf.Tensor | None = None
head_mask: np.ndarray | tf.Tensor | None = None
inputs_embeds: np.ndarray | tf.Tensor | None = None
use_mems: Optional[bool] = None
output_attentions: Optional[bool] = None
output_hidden_states: Optional[bool] = None
return_dict: Optional[bool] = None
labels: np.ndarray | tf.Tensor | None = None
training: bool = False
)
→
transformers.models.xlnet.modeling_tf_xlnet.TFXLNetForMultipleChoiceOutput or tuple(tf.Tensor)
Parameters 
input_ids (torch.LongTensor of shape (batch_size, num_choices, sequence_length)) —
Indices of input sequence tokens in the vocabulary.
Indices can be obtained using AutoTokenizer. See PreTrainedTokenizer.encode() and
PreTrainedTokenizer.call() for details.
What are input IDs?
attention_mask (torch.FloatTensor of shape (batch_size, num_choices, sequence_length), optional) —
Mask to avoid performing attention on padding token indices. Mask values selected in [0, 1]:
1 for tokens that are not masked,
0 for tokens that are masked.
What are attention masks?
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states (see mems output below) . Can be used to speed up sequential
decoding. The token ids which have their past given to this model should not be passed as input_ids as
they have already been computed.
use_mems has to be set to True to make use of mems.
perm_mask (torch.FloatTensor of shape (batch_size, sequence_length, sequence_length), optional) —
Mask to indicate the attention pattern for each input token with values selected in [0, 1]:
if perm_mask[k, i, j] = 0, i attend to j in batch k;
if perm_mask[k, i, j] = 1, i does not attend to j in batch k.
If not set, each token attends to all the others (full bidirectional attention). Only used during
pretraining (to define factorization order) or for sequential decoding (generation).
target_mapping (torch.FloatTensor of shape (batch_size, num_predict, sequence_length), optional) —
Mask to indicate the output tokens to use. If target_mapping[k, i, j] = 1, the i-th predict in batch k is
on the j-th token. Only used during pretraining for partial prediction or for sequential decoding
(generation).
token_type_ids (torch.LongTensor of shape (batch_size, num_choices, sequence_length), optional) —
Segment token indices to indicate first and second portions of the inputs. Indices are selected in [0, 1]:
0 corresponds to a sentence A token,
1 corresponds to a sentence B token.
What are token type IDs?
input_mask (torch.FloatTensor of shape batch_size, num_choices, sequence_length, optional) —
Mask to avoid performing attention on padding token indices. Negative of attention_mask, i.e. with 0 for
real tokens and 1 for padding which is kept for compatibility with the original code base.
Mask values selected in [0, 1]:
1 for tokens that are masked,
0 for tokens that are not masked.
You can only uses one of input_mask and attention_mask.
head_mask (torch.FloatTensor of shape (num_heads,) or (num_layers, num_heads), optional) —
Mask to nullify selected heads of the self-attention modules. Mask values selected in [0, 1]:
1 indicates the head is not masked,
0 indicates the head is masked.
inputs_embeds (torch.FloatTensor of shape (batch_size, num_choices, sequence_length, hidden_size), optional) —
Optionally, instead of passing input_ids you can choose to directly pass an embedded representation. This
is useful if you want more control over how to convert input_ids indices into associated vectors than the
model’s internal embedding lookup matrix.
output_attentions (bool, optional) —
Whether or not to return the attentions tensors of all attention layers. See attentions under returned
tensors for more detail.
output_hidden_states (bool, optional) —
Whether or not to return the hidden states of all layers. See hidden_states under returned tensors for
more detail.
return_dict (bool, optional) —
Whether or not to return a ModelOutput instead of a plain tuple.
labels (tf.Tensor of shape (batch_size,), optional) —
Labels for computing the multiple choice classification loss. Indices should be in [0, ..., num_choices]
where num_choices is the size of the second dimension of the input tensors. (See input_ids above)
Returns
transformers.models.xlnet.modeling_tf_xlnet.TFXLNetForMultipleChoiceOutput or tuple(tf.Tensor)
A transformers.models.xlnet.modeling_tf_xlnet.TFXLNetForMultipleChoiceOutput or a tuple of tf.Tensor (if
return_dict=False is passed or when config.return_dict=False) comprising various elements depending on the
configuration (XLNetConfig) and inputs.
loss (tf.Tensor of shape (1,), optional, returned when labels is provided) — Classification loss.
logits (tf.Tensor of shape (batch_size, num_choices)) — num_choices is the second dimension of the input tensors. (see input_ids above).
Classification scores (before SoftMax).
mems (List[tf.Tensor] of length config.n_layers) — Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(tf.Tensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) — Tuple of tf.Tensor (one for the output of the embeddings + one for the output of each layer) of shape
(batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(tf.Tensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) — Tuple of tf.Tensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
The TFXLNetForMultipleChoice forward method, overrides the __call__ special method.
Although the recipe for forward pass needs to be defined within this function, one should call the Module
instance afterwards instead of this since the former takes care of running the pre and post processing steps while
the latter silently ignores them.
Example:
	Copied
 from transformers import AutoTokenizer, TFXLNetForMultipleChoice
 import tensorflow as tf
 tokenizer = AutoTokenizer.from_pretrained("xlnet-base-cased")
 model = TFXLNetForMultipleChoice.from_pretrained("xlnet-base-cased")
 prompt = "In Italy, pizza served in formal settings, such as at a restaurant, is presented unsliced."
 choice0 = "It is eaten with a fork and a knife."
 choice1 = "It is eaten while held in the hand."
 encoding = tokenizer([prompt, prompt], [choice0, choice1], return_tensors="tf", padding=True)
 inputs = {k: tf.expand_dims(v, 0) for k, v in encoding.items()}
 outputs = model(inputs)  # batch size is 1
 # the linear classifier still needs to be trained
 logits = outputs.logits
TFXLNetForTokenClassification
	
class transformers.TFXLNetForTokenClassification
<
source
>
(
*args
**kwargs
)
Parameters 
config (XLNetConfig) — Model configuration class with all the parameters of the model.
Initializing with a config file does not load the weights associated with the model, only the
configuration. Check out the from_pretrained() method to load the model weights.
XLNet Model with a token classification head on top (a linear layer on top of the hidden-states output) e.g. for
Named-Entity-Recognition (NER) tasks.
This model inherits from TFPreTrainedModel. Check the superclass documentation for the generic methods the
library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads
etc.)
This model is also a tf.keras.Model subclass. Use it
as a regular TF 2.0 Keras Model and refer to the TF 2.0 documentation for all matter related to general usage and
behavior.
TensorFlow models and layers in transformers accept two formats as input:
having all inputs as keyword arguments (like PyTorch models), or
having all inputs as a list, tuple or dict in the first positional argument.
The reason the second format is supported is that Keras methods prefer this format when passing inputs to models
and layers. Because of this support, when using methods like model.fit() things should “just work” for you - just
pass your inputs and labels in any format that model.fit() supports! If, however, you want to use the second
format outside of Keras methods like fit() and predict(), such as when creating your own layers or models with
the Keras Functional API, there are three possibilities you can use to gather all the input Tensors in the first
positional argument:
a single Tensor with input_ids only and nothing else: model(input_ids)
a list of varying length with one or several input Tensors IN THE ORDER given in the docstring:
model([input_ids, attention_mask]) or model([input_ids, attention_mask, token_type_ids])
a dictionary with one or several input Tensors associated to the input names given in the docstring:
model({"input_ids": input_ids, "token_type_ids": token_type_ids})
Note that when creating models and layers with
subclassing then you don’t need to worry
about any of this, as you can just pass inputs like you would to any other Python function!
call
<
source
>
(
input_ids: TFModelInputType | None = None
attention_mask: np.ndarray | tf.Tensor | None = None
mems: np.ndarray | tf.Tensor | None = None
perm_mask: np.ndarray | tf.Tensor | None = None
target_mapping: np.ndarray | tf.Tensor | None = None
token_type_ids: np.ndarray | tf.Tensor | None = None
input_mask: np.ndarray | tf.Tensor | None = None
head_mask: np.ndarray | tf.Tensor | None = None
inputs_embeds: np.ndarray | tf.Tensor | None = None
use_mems: Optional[bool] = None
output_attentions: Optional[bool] = None
output_hidden_states: Optional[bool] = None
return_dict: Optional[bool] = None
labels: np.ndarray | tf.Tensor | None = None
training: bool = False
)
→
transformers.models.xlnet.modeling_tf_xlnet.TFXLNetForTokenClassificationOutput or tuple(tf.Tensor)
Parameters 
input_ids (torch.LongTensor of shape (batch_size, sequence_length)) —
Indices of input sequence tokens in the vocabulary.
Indices can be obtained using AutoTokenizer. See PreTrainedTokenizer.encode() and
PreTrainedTokenizer.call() for details.
What are input IDs?
attention_mask (torch.FloatTensor of shape (batch_size, sequence_length), optional) —
Mask to avoid performing attention on padding token indices. Mask values selected in [0, 1]:
1 for tokens that are not masked,
0 for tokens that are masked.
What are attention masks?
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states (see mems output below) . Can be used to speed up sequential
decoding. The token ids which have their past given to this model should not be passed as input_ids as
they have already been computed.
use_mems has to be set to True to make use of mems.
perm_mask (torch.FloatTensor of shape (batch_size, sequence_length, sequence_length), optional) —
Mask to indicate the attention pattern for each input token with values selected in [0, 1]:
if perm_mask[k, i, j] = 0, i attend to j in batch k;
if perm_mask[k, i, j] = 1, i does not attend to j in batch k.
If not set, each token attends to all the others (full bidirectional attention). Only used during
pretraining (to define factorization order) or for sequential decoding (generation).
target_mapping (torch.FloatTensor of shape (batch_size, num_predict, sequence_length), optional) —
Mask to indicate the output tokens to use. If target_mapping[k, i, j] = 1, the i-th predict in batch k is
on the j-th token. Only used during pretraining for partial prediction or for sequential decoding
(generation).
token_type_ids (torch.LongTensor of shape (batch_size, sequence_length), optional) —
Segment token indices to indicate first and second portions of the inputs. Indices are selected in [0, 1]:
0 corresponds to a sentence A token,
1 corresponds to a sentence B token.
What are token type IDs?
input_mask (torch.FloatTensor of shape batch_size, sequence_length, optional) —
Mask to avoid performing attention on padding token indices. Negative of attention_mask, i.e. with 0 for
real tokens and 1 for padding which is kept for compatibility with the original code base.
Mask values selected in [0, 1]:
1 for tokens that are masked,
0 for tokens that are not masked.
You can only uses one of input_mask and attention_mask.
head_mask (torch.FloatTensor of shape (num_heads,) or (num_layers, num_heads), optional) —
Mask to nullify selected heads of the self-attention modules. Mask values selected in [0, 1]:
1 indicates the head is not masked,
0 indicates the head is masked.
inputs_embeds (torch.FloatTensor of shape (batch_size, sequence_length, hidden_size), optional) —
Optionally, instead of passing input_ids you can choose to directly pass an embedded representation. This
is useful if you want more control over how to convert input_ids indices into associated vectors than the
model’s internal embedding lookup matrix.
output_attentions (bool, optional) —
Whether or not to return the attentions tensors of all attention layers. See attentions under returned
tensors for more detail.
output_hidden_states (bool, optional) —
Whether or not to return the hidden states of all layers. See hidden_states under returned tensors for
more detail.
return_dict (bool, optional) —
Whether or not to return a ModelOutput instead of a plain tuple.
labels (tf.Tensor of shape (batch_size, sequence_length), optional) —
Labels for computing the token classification loss. Indices should be in [0, ..., config.num_labels - 1].
Returns
transformers.models.xlnet.modeling_tf_xlnet.TFXLNetForTokenClassificationOutput or tuple(tf.Tensor)
A transformers.models.xlnet.modeling_tf_xlnet.TFXLNetForTokenClassificationOutput or a tuple of tf.Tensor (if
return_dict=False is passed or when config.return_dict=False) comprising various elements depending on the
configuration (XLNetConfig) and inputs.
loss (tf.Tensor of shape (1,), optional, returned when labels is provided)  — Classification loss.
logits (tf.Tensor of shape (batch_size, sequence_length, config.num_labels)) — Classification scores (before SoftMax).
mems (List[tf.Tensor] of length config.n_layers) — Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(tf.Tensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) — Tuple of tf.Tensor (one for the output of the embeddings + one for the output of each layer) of shape
(batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(tf.Tensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) — Tuple of tf.Tensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
The TFXLNetForTokenClassification forward method, overrides the __call__ special method.
Although the recipe for forward pass needs to be defined within this function, one should call the Module
instance afterwards instead of this since the former takes care of running the pre and post processing steps while
the latter silently ignores them.
Example:
	Copied
 from transformers import AutoTokenizer, TFXLNetForTokenClassification
 import tensorflow as tf
 tokenizer = AutoTokenizer.from_pretrained("xlnet-base-cased")
 model = TFXLNetForTokenClassification.from_pretrained("xlnet-base-cased")
 inputs = tokenizer(
...     "HuggingFace is a company based in Paris and New York", add_special_tokens=False, return_tensors="tf"
... )
 logits = model(**inputs).logits
 predicted_token_class_ids = tf.math.argmax(logits, axis=-1)
 # Note that tokens are classified rather then input words which means that
 # there might be more predicted token classes than words.
 # Multiple token classes might account for the same word
 predicted_tokens_classes = [model.config.id2label[t] for t in predicted_token_class_ids[0].numpy().tolist()]
	Copied
 labels = predicted_token_class_ids
 loss = tf.math.reduce_mean(model(**inputs, labels=labels).loss)
TFXLNetForQuestionAnsweringSimple
	
class transformers.TFXLNetForQuestionAnsweringSimple
<
source
>
(
*args
**kwargs
)
Parameters 
config (XLNetConfig) — Model configuration class with all the parameters of the model.
Initializing with a config file does not load the weights associated with the model, only the
configuration. Check out the from_pretrained() method to load the model weights.
XLNet Model with a span classification head on top for extractive question-answering tasks like SQuAD (a linear
layers on top of the hidden-states output to compute span start logits and span end logits).
This model inherits from TFPreTrainedModel. Check the superclass documentation for the generic methods the
library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads
etc.)
This model is also a tf.keras.Model subclass. Use it
as a regular TF 2.0 Keras Model and refer to the TF 2.0 documentation for all matter related to general usage and
behavior.
TensorFlow models and layers in transformers accept two formats as input:
having all inputs as keyword arguments (like PyTorch models), or
having all inputs as a list, tuple or dict in the first positional argument.
The reason the second format is supported is that Keras methods prefer this format when passing inputs to models
and layers. Because of this support, when using methods like model.fit() things should “just work” for you - just
pass your inputs and labels in any format that model.fit() supports! If, however, you want to use the second
format outside of Keras methods like fit() and predict(), such as when creating your own layers or models with
the Keras Functional API, there are three possibilities you can use to gather all the input Tensors in the first
positional argument:
a single Tensor with input_ids only and nothing else: model(input_ids)
a list of varying length with one or several input Tensors IN THE ORDER given in the docstring:
model([input_ids, attention_mask]) or model([input_ids, attention_mask, token_type_ids])
a dictionary with one or several input Tensors associated to the input names given in the docstring:
model({"input_ids": input_ids, "token_type_ids": token_type_ids})
Note that when creating models and layers with
subclassing then you don’t need to worry
about any of this, as you can just pass inputs like you would to any other Python function!
call
<
source
>
(
input_ids: TFModelInputType | None = None
attention_mask: np.ndarray | tf.Tensor | None = None
mems: np.ndarray | tf.Tensor | None = None
perm_mask: np.ndarray | tf.Tensor | None = None
target_mapping: np.ndarray | tf.Tensor | None = None
token_type_ids: np.ndarray | tf.Tensor | None = None
input_mask: np.ndarray | tf.Tensor | None = None
head_mask: np.ndarray | tf.Tensor | None = None
inputs_embeds: np.ndarray | tf.Tensor | None = None
use_mems: Optional[bool] = None
output_attentions: Optional[bool] = None
output_hidden_states: Optional[bool] = None
return_dict: Optional[bool] = None
start_positions: np.ndarray | tf.Tensor | None = None
end_positions: np.ndarray | tf.Tensor | None = None
training: bool = False
)
→
transformers.models.xlnet.modeling_tf_xlnet.TFXLNetForQuestionAnsweringSimpleOutput or tuple(tf.Tensor)
Parameters 
input_ids (torch.LongTensor of shape (batch_size, sequence_length)) —
Indices of input sequence tokens in the vocabulary.
Indices can be obtained using AutoTokenizer. See PreTrainedTokenizer.encode() and
PreTrainedTokenizer.call() for details.
What are input IDs?
attention_mask (torch.FloatTensor of shape (batch_size, sequence_length), optional) —
Mask to avoid performing attention on padding token indices. Mask values selected in [0, 1]:
1 for tokens that are not masked,
0 for tokens that are masked.
What are attention masks?
mems (List[torch.FloatTensor] of length config.n_layers) —
Contains pre-computed hidden-states (see mems output below) . Can be used to speed up sequential
decoding. The token ids which have their past given to this model should not be passed as input_ids as
they have already been computed.
use_mems has to be set to True to make use of mems.
perm_mask (torch.FloatTensor of shape (batch_size, sequence_length, sequence_length), optional) —
Mask to indicate the attention pattern for each input token with values selected in [0, 1]:
if perm_mask[k, i, j] = 0, i attend to j in batch k;
if perm_mask[k, i, j] = 1, i does not attend to j in batch k.
If not set, each token attends to all the others (full bidirectional attention). Only used during
pretraining (to define factorization order) or for sequential decoding (generation).
target_mapping (torch.FloatTensor of shape (batch_size, num_predict, sequence_length), optional) —
Mask to indicate the output tokens to use. If target_mapping[k, i, j] = 1, the i-th predict in batch k is
on the j-th token. Only used during pretraining for partial prediction or for sequential decoding
(generation).
token_type_ids (torch.LongTensor of shape (batch_size, sequence_length), optional) —
Segment token indices to indicate first and second portions of the inputs. Indices are selected in [0, 1]:
0 corresponds to a sentence A token,
1 corresponds to a sentence B token.
What are token type IDs?
input_mask (torch.FloatTensor of shape batch_size, sequence_length, optional) —
Mask to avoid performing attention on padding token indices. Negative of attention_mask, i.e. with 0 for
real tokens and 1 for padding which is kept for compatibility with the original code base.
Mask values selected in [0, 1]:
1 for tokens that are masked,
0 for tokens that are not masked.
You can only uses one of input_mask and attention_mask.
head_mask (torch.FloatTensor of shape (num_heads,) or (num_layers, num_heads), optional) —
Mask to nullify selected heads of the self-attention modules. Mask values selected in [0, 1]:
1 indicates the head is not masked,
0 indicates the head is masked.
inputs_embeds (torch.FloatTensor of shape (batch_size, sequence_length, hidden_size), optional) —
Optionally, instead of passing input_ids you can choose to directly pass an embedded representation. This
is useful if you want more control over how to convert input_ids indices into associated vectors than the
model’s internal embedding lookup matrix.
output_attentions (bool, optional) —
Whether or not to return the attentions tensors of all attention layers. See attentions under returned
tensors for more detail.
output_hidden_states (bool, optional) —
Whether or not to return the hidden states of all layers. See hidden_states under returned tensors for
more detail.
return_dict (bool, optional) —
Whether or not to return a ModelOutput instead of a plain tuple.
start_positions (tf.Tensor of shape (batch_size,), optional) —
Labels for position (index) of the start of the labelled span for computing the token classification loss.
Positions are clamped to the length of the sequence (sequence_length). Position outside of the sequence
are not taken into account for computing the loss.
end_positions (tf.Tensor of shape (batch_size,), optional) —
Labels for position (index) of the end of the labelled span for computing the token classification loss.
Positions are clamped to the length of the sequence (sequence_length). Position outside of the sequence
are not taken into account for computing the loss.
Returns
transformers.models.xlnet.modeling_tf_xlnet.TFXLNetForQuestionAnsweringSimpleOutput or tuple(tf.Tensor)
A transformers.models.xlnet.modeling_tf_xlnet.TFXLNetForQuestionAnsweringSimpleOutput or a tuple of tf.Tensor (if
return_dict=False is passed or when config.return_dict=False) comprising various elements depending on the
configuration (XLNetConfig) and inputs.
loss (tf.Tensor of shape (1,), optional, returned when labels is provided) — Total span extraction loss is the sum of a Cross-Entropy for the start and end positions.
start_logits (tf.Tensor of shape (batch_size, sequence_length,)) — Span-start scores (before SoftMax).
end_logits (tf.Tensor of shape (batch_size, sequence_length,)) — Span-end scores (before SoftMax).
mems (List[tf.Tensor] of length config.n_layers) — Contains pre-computed hidden-states. Can be used (see mems input) to speed up sequential decoding. The
token ids which have their past given to this model should not be passed as input_ids as they have
already been computed.
hidden_states (tuple(tf.Tensor), optional, returned when output_hidden_states=True is passed or when config.output_hidden_states=True) — Tuple of tf.Tensor (one for the output of the embeddings + one for the output of each layer) of shape
(batch_size, sequence_length, hidden_size).
Hidden-states of the model at the output of each layer plus the initial embedding outputs.
attentions (tuple(tf.Tensor), optional, returned when output_attentions=True is passed or when config.output_attentions=True) — Tuple of tf.Tensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
heads.
The TFXLNetForQuestionAnsweringSimple forward method, overrides the __call__ special method.
Although the recipe for forward pass needs to be defined within this function, one should call the Module
instance afterwards instead of this since the former takes care of running the pre and post processing steps while
the latter silently ignores them.
Example:
	Copied
 from transformers import AutoTokenizer, TFXLNetForQuestionAnsweringSimple
 import tensorflow as tf
 tokenizer = AutoTokenizer.from_pretrained("xlnet-base-cased")
 model = TFXLNetForQuestionAnsweringSimple.from_pretrained("xlnet-base-cased")
 question, text = "Who was Jim Henson?", "Jim Henson was a nice puppet"
 inputs = tokenizer(question, text, return_tensors="tf")
 outputs = model(**inputs)
 answer_start_index = int(tf.math.argmax(outputs.start_logits, axis=-1)[0])
 answer_end_index = int(tf.math.argmax(outputs.end_logits, axis=-1)[0])
 predict_answer_tokens = inputs.input_ids[0, answer_start_index : answer_end_index + 1]
	Copied
 # target is "nice puppet"
 target_start_index = tf.constant([14])
 target_end_index = tf.constant([15])
 outputs = model(**inputs, start_positions=target_start_index, end_positions=target_end_index)
 loss = tf.math.reduce_mean(outputs.loss)
←XLM-V
YOSO→
XLNet
Overview
Documentation resources
XLNetConfig
XLNetTokenizer
XLNetTokenizerFast
XLNet specific outputs
XLNetModel
XLNetLMHeadModel
XLNetForSequenceClassification
XLNetForMultipleChoice
XLNetForTokenClassification
XLNetForQuestionAnsweringSimple
XLNetForQuestionAnswering
TFXLNetModel
TFXLNetLMHeadModel
TFXLNetForSequenceClassification
TFLNetForMultipleChoice
TFXLNetForTokenClassification
TFXLNetForQuestionAnsweringSimple
