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# Copyright 2024 Rhymes AI. All rights reserved.
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
from dataclasses import dataclass
from typing import List, Optional, Tuple, Union
import torch
import torch.nn as nn
from torch import nn
from transformers import PreTrainedModel
from transformers.cache_utils import Cache
from transformers.modeling_outputs import ModelOutput
from transformers.utils import logging
from .configuration_aria import AriaConfig
from .moe_lm import AriaMoELMForCausalLM
from .projector import AriaProjector
from .vision_encoder import AriaVisionModel
logger = logging.get_logger(__name__)
class AriaPretrainedModel(PreTrainedModel):
"""
An abstract class to handle weights initialization and a simple interface for downloading and loading pretrained models.
"""
config_class = AriaConfig
base_model_prefix = "model"
_no_split_modules = []
supports_gradient_checkpointing = True
_skip_keys_device_placement = "past_key_values"
_supports_flash_attn_2 = True
_supports_cache_class = True
@property
def _supports_sdpa(self):
"""
Retrieve language_model's attribute to check whether the model supports
SDPA (Scaled Dot Product Attention) or not.
"""
return self.language_model._supports_sdpa
@dataclass
# Copied from transformers.models.llava.modeling_llava.LlavaCausalLMOutputWithPast with Llava->Aria
class AriaCausalLMOutputWithPast(ModelOutput):
"""
Base class for Aria causal language model (or autoregressive) outputs.
Args:
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, sequence_length, config.vocab_size)`):
Prediction scores of the language modeling head (scores for each vocabulary token before SoftMax).
past_key_values (`tuple(tuple(torch.FloatTensor))`, *optional*, returned when `use_cache=True` is passed or when `config.use_cache=True`):
Tuple of `tuple(torch.FloatTensor)` of length `config.n_layers`, with each tuple having 2 tensors of shape
`(batch_size, num_heads, sequence_length, embed_size_per_head)`)
Contains pre-computed hidden-states (key and values in the self-attention blocks) that can be used (see
`past_key_values` input) to speed up sequential decoding.
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, if the model has an embedding layer, +
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 optional 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.
image_hidden_states (`tuple(torch.FloatTensor)`, *optional*):
Tuple of `torch.FloatTensor` (one for the output of the image embeddings, `(batch_size, num_images,
sequence_length, hidden_size)`.
image_hidden_states of the model produced by the vision encoder, and optionally by the perceiver
"""
loss: Optional[torch.FloatTensor] = None
logits: torch.FloatTensor = None
past_key_values: Optional[List[torch.FloatTensor]] = None
hidden_states: Optional[Tuple[torch.FloatTensor]] = None
attentions: Optional[Tuple[torch.FloatTensor]] = None
image_hidden_states: Optional[Tuple[torch.FloatTensor]] = None
def build_mm_projector(config: AriaConfig):
"""
Builds and returns an AriaProjector instance based on the provided configuration.
Args:
config (AriaConfig): The configuration object containing necessary parameters.
Returns:
AriaProjector: An instance of the AriaProjector class.
"""
return AriaProjector(
patch_to_query_dict=config.projector_patch_to_query_dict,
embed_dim=config.vision_config.hidden_size,
num_heads=config.vision_config.num_attention_heads,
kv_dim=config.vision_config.hidden_size,
ff_dim=config.text_config.hidden_size,
output_dim=config.text_config.hidden_size,
)
# adapted from transformers.models.llava.modeling_llava.LlavaForConditionalGeneration
class AriaForConditionalGeneration(AriaPretrainedModel):
"""
Aria model for conditional generation tasks.
This model combines a vision tower, a multi-modal projector, and a language model
to perform tasks that involve both image and text inputs.
"""
def __init__(self, config: AriaConfig):
super().__init__(config)
self.vision_tower = AriaVisionModel(config.vision_config)
self.multi_modal_projector = build_mm_projector(config)
self.vocab_size = config.text_config.vocab_size
self.language_model = AriaMoELMForCausalLM(config.text_config)
self.pad_token_id = (
self.config.pad_token_id if self.config.pad_token_id is not None else -1
)
self.post_init()
def freeze_vit(self):
"""Freeze the parameters of the vision tower."""
for param in self.vision_tower.parameters():
param.requires_grad = False
def freeze_projector(self):
"""Freeze the parameters of the multi-modal projector."""
for param in self.multi_modal_projector.parameters():
param.requires_grad = False
def freeze_llm(self):
"""Freeze the parameters of the language model."""
for param in self.language_model.parameters():
param.requires_grad = False
def get_input_embeddings(self) -> nn.Module:
"""Retrieve the input embeddings from the language model."""
return self.language_model.get_input_embeddings()
def set_input_embeddings(self, value):
"""Set the input embeddings for the language model."""
self.language_model.set_input_embeddings(value)
def set_moe_z_loss_coeff(self, value):
"""
Set the z-loss coefficient for Mixture of Experts (MoE) models.
Args:
value: The z-loss coefficient value to set.
"""
self.language_model.set_z_loss_coeff(value)
def set_moe_aux_loss_coeff(self, value):
"""
Set the auxiliary loss coefficient for Mixture of Experts (MoE) models.
Args:
value: The auxiliary loss coefficient value to set.
"""
self.language_model.set_aux_loss_coeff(value)
# copied from transformers.models.llava.modeling_llava.LlavaForConditionalGeneration
def _merge_input_ids_with_image_features(
self, image_features, inputs_embeds, input_ids, attention_mask, labels
):
"""
Merge input IDs with image features to create a combined input representation.
This method handles the complex logic of interleaving text and image tokens,
adjusting attention masks and labels accordingly.
Args:
image_features (torch.Tensor): Processed image features.
inputs_embeds (torch.Tensor): Text input embeddings.
input_ids (torch.Tensor): Input token IDs.
attention_mask (torch.Tensor): Attention mask for input tokens.
labels (torch.Tensor, optional): Labels for language modeling.
Returns:
tuple: Contains the merged embeddings, updated attention mask,
updated labels, and position IDs.
"""
num_images, num_image_patches, embed_dim = image_features.shape
batch_size, sequence_length = input_ids.shape
left_padding = not torch.sum(
input_ids[:, -1] == torch.tensor(self.pad_token_id)
)
# 1. Create a mask to know where special image tokens are
special_image_token_mask = input_ids == self.config.image_token_index
num_special_image_tokens = torch.sum(special_image_token_mask, dim=-1)
# Compute the maximum embed dimension
max_embed_dim = (
num_special_image_tokens.max() * (num_image_patches - 1)
) + sequence_length
batch_indices, non_image_indices = torch.where(
input_ids != self.config.image_token_index
)
# 2. Compute the positions where text should be written
# Calculate new positions for text tokens in merged image-text sequence.
# `special_image_token_mask` identifies image tokens. Each image token will be replaced by `nb_text_tokens_per_images - 1` text tokens.
# `torch.cumsum` computes how each image token shifts subsequent text token positions.
# - 1 to adjust for zero-based indexing, as `cumsum` inherently increases indices by one.
new_token_positions = (
torch.cumsum((special_image_token_mask * (num_image_patches - 1) + 1), -1)
- 1
)
nb_image_pad = max_embed_dim - 1 - new_token_positions[:, -1]
if left_padding:
new_token_positions += nb_image_pad[:, None] # offset for left padding
text_to_overwrite = new_token_positions[batch_indices, non_image_indices]
# 3. Create the full embedding, already padded to the maximum position
final_embedding = torch.zeros(
batch_size,
max_embed_dim,
embed_dim,
dtype=inputs_embeds.dtype,
device=inputs_embeds.device,
)
final_attention_mask = torch.zeros(
batch_size,
max_embed_dim,
dtype=attention_mask.dtype,
device=inputs_embeds.device,
)
if labels is not None:
final_labels = torch.full(
(batch_size, max_embed_dim),
self.config.ignore_index,
dtype=input_ids.dtype,
device=input_ids.device,
)
# In case the Vision model or the Language model has been offloaded to CPU, we need to manually
# set the corresponding tensors into their correct target device.
target_device = inputs_embeds.device
batch_indices, non_image_indices, text_to_overwrite = (
batch_indices.to(target_device),
non_image_indices.to(target_device),
text_to_overwrite.to(target_device),
)
attention_mask = attention_mask.to(target_device)
# 4. Fill the embeddings based on the mask. If we have ["hey" "<image>", "how", "are"]
# we need to index copy on [0, 577, 578, 579] for the text and [1:576] for the image features
final_embedding[batch_indices, text_to_overwrite] = inputs_embeds[
batch_indices, non_image_indices
]
final_attention_mask[batch_indices, text_to_overwrite] = attention_mask[
batch_indices, non_image_indices
]
if labels is not None:
final_labels[batch_indices, text_to_overwrite] = labels[
batch_indices, non_image_indices
]
# 5. Fill the embeddings corresponding to the images. Anything that is not `text_positions` needs filling (#29835)
image_to_overwrite = torch.full(
(batch_size, max_embed_dim),
True,
dtype=torch.bool,
device=inputs_embeds.device,
)
image_to_overwrite[batch_indices, text_to_overwrite] = False
image_to_overwrite &= image_to_overwrite.cumsum(-1) - 1 >= nb_image_pad[
:, None
].to(target_device)
if image_to_overwrite.sum() != image_features.shape[:-1].numel():
raise ValueError(
f"The input provided to the model are wrong. The number of image tokens is {torch.sum(special_image_token_mask)} while"
f" the number of image given to the model is {num_images}. This prevents correct indexing and breaks batch generation."
)
final_embedding[image_to_overwrite] = (
image_features.contiguous().reshape(-1, embed_dim).to(target_device)
)
final_attention_mask |= image_to_overwrite
position_ids = (final_attention_mask.cumsum(-1) - 1).masked_fill_(
(final_attention_mask == 0), 1
)
# 6. Mask out the embedding at padding positions, as we later use the past_key_value value to determine the non-attended tokens.
batch_indices, pad_indices = torch.where(input_ids == self.pad_token_id)
indices_to_mask = new_token_positions[batch_indices, pad_indices]
final_embedding[batch_indices, indices_to_mask] = 0
if labels is None:
final_labels = None
return final_embedding, final_attention_mask, final_labels, position_ids
def forward(
self,
input_ids: torch.LongTensor = None,
pixel_values: torch.FloatTensor = None,
pixel_mask: torch.LongTensor = None,
attention_mask: Optional[torch.Tensor] = None,
position_ids: Optional[torch.LongTensor] = None,
past_key_values: Optional[List[torch.FloatTensor]] = None,
inputs_embeds: Optional[torch.FloatTensor] = None,
labels: Optional[torch.LongTensor] = None,
use_cache: Optional[bool] = None,
output_attentions: Optional[bool] = None,
output_hidden_states: Optional[bool] = None,
return_dict: Optional[bool] = None,
) -> Union[Tuple, AriaCausalLMOutputWithPast]:
"""
Forward pass of the AriaForConditionalGeneration model.
This method processes both text and image inputs, merges them if necessary,
and generates output using the language model.
Args:
input_ids (torch.LongTensor, optional): Input token ids.
pixel_values (torch.FloatTensor, optional): Pixel values of the images.
pixel_mask (torch.LongTensor, optional): Mask for the pixel values.
attention_mask (torch.Tensor, optional): Attention mask.
position_ids (torch.LongTensor, optional): Position ids.
past_key_values (List[torch.FloatTensor], optional): Past key values for efficient processing.
inputs_embeds (torch.FloatTensor, optional): Input embeddings.
labels (torch.LongTensor, optional): Labels for computing the language modeling loss.
use_cache (bool, optional): Whether to use the model's cache mechanism.
output_attentions (bool, optional): Whether to output attention weights.
output_hidden_states (bool, optional): Whether to output hidden states.
return_dict (bool, optional): Whether to return a ModelOutput object.
Returns:
Union[Tuple, AriaCausalLMOutputWithPast]: Model outputs.
"""
output_attentions = (
output_attentions
if output_attentions is not None
else self.config.output_attentions
)
output_hidden_states = (
output_hidden_states
if output_hidden_states is not None
else self.config.output_hidden_states
)
return_dict = (
return_dict if return_dict is not None else self.config.use_return_dict
)
if inputs_embeds is None:
# 1. Extra the input embeddings
inputs_embeds = self.get_input_embeddings()(input_ids)
# 2. Merge text and images
if pixel_values is not None and input_ids.shape[1] != 1:
image_outputs, image_attn_mask = self.vision_tower(
pixel_values,
pixel_mask=pixel_mask,
)
selected_image_feature = image_outputs.last_hidden_state
image_features = self.multi_modal_projector(
selected_image_feature, attn_mask=image_attn_mask
)
inputs_embeds = inputs_embeds.to(image_features.dtype)
(
inputs_embeds,
attention_mask,
labels,
position_ids,
) = self._merge_input_ids_with_image_features(
image_features, inputs_embeds, input_ids, attention_mask, labels
)
# In case input_ids.shape[1] == 1 & pixel_values != None & past_key_values != None, we are in the case of
# generation with cache
elif (
past_key_values is not None
and pixel_values is not None
and input_ids.shape[1] == 1
):
# Retrieve the first layer to inspect the logits and mask out the hidden states
# that are set to 0
first_layer_past_key_value = past_key_values[0][0][:, :, :, 0]
# Sum all dimensions of head_dim (-2) to avoid random errors
# such as: https://github.com/huggingface/transformers/pull/28032#issuecomment-1863691941
batch_index, non_attended_tokens = torch.where(
first_layer_past_key_value.float().sum(-2) == 0
)
# Get the target length
target_length = input_ids.shape[1]
past_length = first_layer_past_key_value.shape[-1]
extended_attention_mask = torch.ones(
(attention_mask.shape[0], past_length),
dtype=attention_mask.dtype,
device=attention_mask.device,
)
# Filter out only the tokens that can be un-attended, this can happen
# if one uses Llava + Fused modules where the cache on the
# first iteration is already big enough, or if one passes custom cache
valid_indices = non_attended_tokens < extended_attention_mask.size(-1)
new_batch_index = batch_index[valid_indices]
new_non_attended_tokens = non_attended_tokens[valid_indices]
# Zero-out the places where we don't need to attend
extended_attention_mask[new_batch_index, new_non_attended_tokens] = 0
attention_mask = torch.cat(
(extended_attention_mask, attention_mask[:, -target_length:]), dim=1
)
position_ids = torch.sum(attention_mask, dim=1).unsqueeze(-1) - 1
outputs = self.language_model(
attention_mask=attention_mask,
position_ids=position_ids,
past_key_values=past_key_values,
inputs_embeds=inputs_embeds,
use_cache=use_cache,
output_attentions=output_attentions,
output_hidden_states=output_hidden_states,
return_dict=return_dict,
)
logits = outputs[0]
loss = None
if labels is not None:
# Shift so that tokens < n predict n
if attention_mask is not None:
shift_attention_mask = attention_mask[..., 1:]
shift_logits = logits[..., :-1, :][
shift_attention_mask.to(logits.device) != 0
].contiguous()
shift_labels = labels[..., 1:][
shift_attention_mask.to(labels.device) != 0
].contiguous()
else:
shift_logits = logits[..., :-1, :].contiguous()
shift_labels = labels[..., 1:].contiguous()
# Flatten the tokens
loss_fct = nn.CrossEntropyLoss()
loss = loss_fct(
shift_logits.view(-1, shift_logits.size(-1)),
shift_labels.view(-1).to(shift_logits.device),
)
if not return_dict:
output = (logits,) + outputs[1:]
return (loss,) + output if loss is not None else output
return AriaCausalLMOutputWithPast(
loss=loss,
logits=logits,
past_key_values=outputs.past_key_values,
hidden_states=outputs.hidden_states,
attentions=outputs.attentions,
)
def prepare_inputs_for_generation(
self,
input_ids,
past_key_values=None,
inputs_embeds=None,
pixel_values=None,
pixel_mask=None,
attention_mask=None,
**kwargs,
):
"""
Prepare inputs for generation step.
This method prepares the inputs for the generation step, handling both
text and image inputs, and managing the model's cache mechanism.
Args:
input_ids (torch.LongTensor): Input token ids.
past_key_values (Cache or List[torch.FloatTensor], optional): Past key values for efficient processing.
inputs_embeds (torch.FloatTensor, optional): Input embeddings.
pixel_values (torch.FloatTensor, optional): Pixel values of the images.
pixel_mask (torch.LongTensor, optional): Mask for the pixel values.
attention_mask (torch.Tensor, optional): Attention mask.
**kwargs: Additional keyword arguments.
Returns:
dict: A dictionary containing the prepared inputs for the generation step.
"""
if past_key_values is not None:
if isinstance(past_key_values, Cache):
cache_length = past_key_values.get_seq_length()
past_length = past_key_values.seen_tokens
else:
cache_length = past_length = past_key_values[0][0].shape[2]
# Keep only the unprocessed tokens:
# 1 - If the length of the attention_mask exceeds the length of input_ids, then we are in a setting where
# some of the inputs are exclusively passed as part of the cache (e.g. when passing input_embeds as
# input)
if (
attention_mask is not None
and attention_mask.shape[1] > input_ids.shape[1]
):
input_ids = input_ids[:, -(attention_mask.shape[1] - past_length) :]
# 2 - If the past_length is smaller than input_ids', then input_ids holds all input tokens. We can discard
# input_ids based on the past_length.
elif past_length < input_ids.shape[1]:
input_ids = input_ids[:, past_length:]
# 3 - Otherwise (past_length >= input_ids.shape[1]), let's assume input_ids only has unprocessed tokens.
elif self.config.image_token_index in input_ids:
input_ids = input_ids[:, input_ids.shape[1] - 1 :]
# If the cache has seen more tokens than it can hold, then the cache has a size limit. Let's discard the
# older attention values, as their corresponding values are not part of the input.
if cache_length < past_length and attention_mask is not None:
attention_mask = attention_mask[
:, -(cache_length + input_ids.shape[1]) :
]
position_ids = kwargs.get("position_ids", None)
if attention_mask is not None and position_ids is None:
# create position_ids on the fly for batch generation
position_ids = attention_mask.long().cumsum(-1) - 1
position_ids.masked_fill_(attention_mask == 0, 1)
if past_key_values:
position_ids = position_ids[:, -input_ids.shape[1] :]
# if `inputs_embeds` are passed, we only want to use them in the 1st generation step
if inputs_embeds is not None and past_key_values is None:
model_inputs = {"inputs_embeds": inputs_embeds}
else:
model_inputs = {"input_ids": input_ids}
model_inputs.update(
{
"position_ids": position_ids,
"past_key_values": past_key_values,
"use_cache": kwargs.get("use_cache"),
"attention_mask": attention_mask,
"pixel_values": pixel_values,
"pixel_mask": pixel_mask,
}
)
return model_inputs
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