#!/usr/bin/env python # coding=utf-8 # Copyright 2021 The HuggingFace Team All rights reserved. # # Licensed 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. """ Fine-tuning the library models for seq2seq, text to image. Script adapted from run_summarization_flax.py """ # You can also adapt this script on your own sequence to sequence task. Pointers for this are left as comments. import os # set a common huggingface cache folder (used with datasets and transformers) and wandb cache folder (used with artifacts) os.environ['HF_HOME'] = '/data/huggingface/' # required before importing transformers & datasets os.environ['WANDB_CACHE_DIR'] = '/data/wandb/' # required before importing wandb import logging as pylogging # To avoid collision with transformers.utils.logging import sys import time from dataclasses import dataclass, field from functools import partial from pathlib import Path from typing import Callable, Optional import datasets import nltk # Here to have a nice missing dependency error message early on import numpy as np from datasets import Dataset, load_dataset, load_metric from tqdm import tqdm import jax import jax.numpy as jnp import optax import transformers from filelock import FileLock from flax import jax_utils, traverse_util import flax.linen as nn from flax.jax_utils import unreplicate from flax.training import train_state from flax.training.common_utils import get_metrics, onehot, shard, shard_prng_key from transformers import ( CONFIG_MAPPING, FLAX_MODEL_FOR_SEQ_TO_SEQ_CAUSAL_LM_MAPPING, AutoConfig, AutoTokenizer, FlaxAutoModelForSeq2SeqLM, FlaxBartForConditionalGeneration, HfArgumentParser, TrainingArguments, ) from transformers.models.bart.modeling_flax_bart import * from transformers.file_utils import is_offline_mode import wandb logger = pylogging.getLogger(__name__) try: nltk.data.find("tokenizers/punkt") except (LookupError, OSError): if is_offline_mode(): raise LookupError( "Offline mode: run this script without TRANSFORMERS_OFFLINE first to download nltk data files" ) with FileLock(".lock") as lock: nltk.download("punkt", quiet=True) MODEL_CONFIG_CLASSES = list(FLAX_MODEL_FOR_SEQ_TO_SEQ_CAUSAL_LM_MAPPING.keys()) MODEL_TYPES = tuple(conf.model_type for conf in MODEL_CONFIG_CLASSES) # Model hyperparameters, for convenience OUTPUT_VOCAB_SIZE = 16384 + 1 # encoded image token space + 1 for bos OUTPUT_LENGTH = 256 + 1 # number of encoded tokens + 1 for bos BOS_TOKEN_ID = 16384 BASE_MODEL = 'facebook/bart-large' @dataclass class ModelArguments: """ Arguments pertaining to which model/config/tokenizer we are going to fine-tune, or train from scratch. """ model_name_or_path: Optional[str] = field( default=BASE_MODEL, metadata={ "help": "The model checkpoint for weights initialization." "Don't set if you want to train a model from scratch." }, ) model_type: Optional[str] = field( default=None, metadata={"help": "If training from scratch, pass a model type from the list: " + ", ".join(MODEL_TYPES)}, ) config_name: Optional[str] = field( default=None, metadata={"help": "Pretrained config name or path if not the same as model_name"} ) tokenizer_name: Optional[str] = field( default=None, metadata={"help": "Pretrained tokenizer name or path if not the same as model_name"} ) cache_dir: Optional[str] = field( default=None, metadata={"help": "Where do you want to store the pretrained models downloaded from s3"} ) use_fast_tokenizer: bool = field( default=True, metadata={"help": "Whether to use one of the fast tokenizer (backed by the tokenizers library) or not."}, ) dtype: Optional[str] = field( default="float32", metadata={ "help": "Floating-point format in which the model weights should be initialized and trained. Choose one of `[float32, float16, bfloat16]`." }, ) @dataclass class DataTrainingArguments: """ Arguments pertaining to what data we are going to input our model for training and eval. """ dataset_name: Optional[str] = field( default=None, metadata={"help": "The name of the dataset to use (via the datasets library)."} ) dataset_config_name: Optional[str] = field( default=None, metadata={"help": "The configuration name of the dataset to use (via the datasets library)."} ) text_column: Optional[str] = field( default='caption', metadata={"help": "The name of the column in the datasets containing the full texts (for summarization)."}, ) encoding_column: Optional[str] = field( default='encoding', metadata={"help": "The name of the column in the datasets containing the image encodings."}, ) train_file: Optional[str] = field(default=None, metadata={"help": "The input training data file (a text file)."}) validation_file: Optional[str] = field( default=None, metadata={"help": "An optional input evaluation data file to evaluate the perplexity on (a text file)."}, ) test_file: Optional[str] = field( default=None, metadata={"help": "An optional input predict data file to do prediction on (a text file)."}, ) max_source_length: Optional[int] = field( default=128, metadata={ "help": "The maximum total input sequence length after tokenization. Sequences longer " "than this will be truncated, sequences shorter will be padded." }, ) no_decay: bool = field( default=False, metadata={"help": "Whether to use decay in the learning rate scheduler."} ) max_target_length: Optional[int] = field( default=OUTPUT_LENGTH, metadata={ "help": "The maximum total sequence length for target text after tokenization. Sequences longer " "than this will be truncated, sequences shorter will be padded." }, ) val_max_target_length: Optional[int] = field( default=OUTPUT_LENGTH, metadata={ "help": "The maximum total sequence length for validation target text after tokenization. Sequences longer " "than this will be truncated, sequences shorter will be padded. Will default to `max_target_length`." "This argument is also used to override the `max_length` param of `model.generate`, which is used " "during evaluation." }, ) max_train_samples: Optional[int] = field( default=None, metadata={ "help": "For debugging purposes or quicker training, truncate the number of training examples to this " "value if set." }, ) max_eval_samples: Optional[int] = field( default=None, metadata={ "help": "For debugging purposes or quicker training, truncate the number of evaluation examples to this " "value if set." }, ) max_predict_samples: Optional[int] = field( default=None, metadata={ "help": "For debugging purposes or quicker training, truncate the number of prediction examples to this " "value if set." }, ) preprocessing_num_workers: Optional[int] = field( default=80, # ensure we have the same datasets cached data and avoid using too much space metadata={"help": "The number of processes to use for the preprocessing."}, ) source_prefix: Optional[str] = field( default=None, metadata={"help": "A prefix to add before every source text (useful for T5 models)."} ) predict_with_generate: bool = field( default=False, metadata={"help": "Whether to use generate to calculate generative metrics (ROUGE, BLEU)."} ) num_beams: Optional[int] = field( default=None, metadata={ "help": "Number of beams to use for evaluation. This argument will be passed to `model.generate`, " "which is used during evaluation." }, ) overwrite_cache: bool = field( default=False, metadata={"help": "Overwrite the cached training and evaluation sets"} ) log_interval: Optional[int] = field( default=40, metadata={ "help": "For debugging purposes or quicker training, truncate the number of training examples to this " "value if set." }, ) log_model: bool = field( default=False, metadata={"help": "Overwrite the cached training and evaluation sets"} ) save_model_steps: Optional[int] = field( default=3000, # about once every hour in our experiments metadata={ "help": "For logging the model more frequently. Used only when `log_model` is set." }, ) def __post_init__(self): if self.dataset_name is None and self.train_file is None and self.validation_file is None: raise ValueError("Need either a dataset name or a training/validation file.") else: if self.train_file is not None: extension = self.train_file.split(".")[-1] assert extension in ["tsv", "csv", "json"], "`train_file` should be a tsv, csv or json file." if self.validation_file is not None: extension = self.validation_file.split(".")[-1] assert extension in ["tsv", "csv", "json"], "`validation_file` should be a tsv, csv or json file." if self.val_max_target_length is None: self.val_max_target_length = self.max_target_length class TrainState(train_state.TrainState): dropout_rng: jnp.ndarray grad_accum: jnp.ndarray optimizer_step: int def replicate(self): return jax_utils.replicate(self).replace(dropout_rng=shard_prng_key(self.dropout_rng)) class CustomFlaxBartModule(FlaxBartModule): def setup(self): # we keep shared to easily load pre-trained weights self.shared = nn.Embed( self.config.vocab_size, self.config.d_model, embedding_init=jax.nn.initializers.normal(self.config.init_std, self.dtype), dtype=self.dtype, ) # a separate embedding is used for the decoder self.decoder_embed = nn.Embed( OUTPUT_VOCAB_SIZE, self.config.d_model, embedding_init=jax.nn.initializers.normal(self.config.init_std, self.dtype), dtype=self.dtype, ) self.encoder = FlaxBartEncoder(self.config, dtype=self.dtype, embed_tokens=self.shared) # the decoder has a different config decoder_config = BartConfig(self.config.to_dict()) decoder_config.max_position_embeddings = OUTPUT_LENGTH decoder_config.min_length = OUTPUT_LENGTH decoder_config.max_length = OUTPUT_LENGTH decoder_config.vocab_size = OUTPUT_VOCAB_SIZE self.decoder = FlaxBartDecoder(decoder_config, dtype=self.dtype, embed_tokens=self.decoder_embed) class CustomFlaxBartForConditionalGenerationModule(FlaxBartForConditionalGenerationModule): def setup(self): self.model = CustomFlaxBartModule(config=self.config, dtype=self.dtype) self.lm_head = nn.Dense( OUTPUT_VOCAB_SIZE, use_bias=False, dtype=self.dtype, kernel_init=jax.nn.initializers.normal(self.config.init_std, self.dtype), ) self.final_logits_bias = self.param("final_logits_bias", self.bias_init, (1, OUTPUT_VOCAB_SIZE)) class CustomFlaxBartForConditionalGeneration(FlaxBartForConditionalGeneration): module_class = CustomFlaxBartForConditionalGenerationModule def data_loader(rng: jax.random.PRNGKey, dataset: Dataset, batch_size: int, shuffle: bool = False): """ Returns batches of size `batch_size` from truncated `dataset`, sharded over all local devices. Shuffle batches if `shuffle` is `True`. """ steps_per_epoch = len(dataset) // batch_size if shuffle: batch_idx = jax.random.permutation(rng, len(dataset)) else: batch_idx = jnp.arange(len(dataset)) batch_idx = batch_idx[: steps_per_epoch * batch_size] # Skip incomplete batch. batch_idx = batch_idx.reshape((steps_per_epoch, batch_size)) for idx in batch_idx: batch = dataset[idx] batch = {k: jnp.array(v) for k, v in batch.items()} batch = shard(batch) yield batch def create_learning_rate_fn( train_ds_size: int, train_batch_size: int, num_train_epochs: int, num_warmup_steps: int, learning_rate: float, no_decay: bool ) -> Callable[[int], jnp.array]: """Returns a linear warmup, linear_decay learning rate function.""" steps_per_epoch = train_ds_size // train_batch_size num_train_steps = steps_per_epoch * num_train_epochs warmup_fn = optax.linear_schedule(init_value=0.0, end_value=learning_rate, transition_steps=num_warmup_steps) if no_decay: return warmup_fn decay_fn = optax.linear_schedule( init_value=learning_rate, end_value=0, transition_steps=num_train_steps - num_warmup_steps ) schedule_fn = optax.join_schedules(schedules=[warmup_fn, decay_fn], boundaries=[num_warmup_steps]) return schedule_fn def wandb_log(metrics, step=None, prefix=None): if jax.process_index() == 0: log_metrics = {f'{prefix}/{k}' if prefix is not None else k: jax.device_get(v) for k,v in metrics.items()} if step is not None: log_metrics['train/step'] = step wandb.log(log_metrics) def main(): # See all possible arguments in src/transformers/training_args.py # or by passing the --help flag to this script. # We now keep distinct sets of args, for a cleaner separation of concerns. parser = HfArgumentParser((ModelArguments, DataTrainingArguments, TrainingArguments)) if len(sys.argv) == 2 and sys.argv[1].endswith(".json"): # If we pass only one argument to the script and it's the path to a json file, # let's parse it to get our arguments. model_args, data_args, training_args = parser.parse_json_file(json_file=os.path.abspath(sys.argv[1])) else: model_args, data_args, training_args = parser.parse_args_into_dataclasses() logger.warning(f"eval_steps has been manually hardcoded") # TODO: remove it later, convenient for now training_args.eval_steps = 400 if ( os.path.exists(training_args.output_dir) and os.listdir(training_args.output_dir) and training_args.do_train and not training_args.overwrite_output_dir ): raise ValueError( f"Output directory ({training_args.output_dir}) already exists and is not empty." "Use --overwrite_output_dir to overcome." ) # Set up wandb run wandb.init( entity='wandb', project='hf-flax-dalle-mini', job_type='Seq2SeqVQGAN', config=parser.parse_args() ) # set default x-axis as 'train/step' wandb.define_metric('train/step') wandb.define_metric('*', step_metric='train/step') # Make one log on every process with the configuration for debugging. pylogging.basicConfig( format="%(asctime)s - %(levelname)s - %(name)s - %(message)s", datefmt="%m/%d/%Y %H:%M:%S", level=pylogging.INFO, ) # Setup logging, we only want one process per machine to log things on the screen. logger.setLevel(pylogging.INFO if jax.process_index() == 0 else pylogging.ERROR) if jax.process_index() == 0: datasets.utils.logging.set_verbosity_warning() transformers.utils.logging.set_verbosity_info() else: datasets.utils.logging.set_verbosity_error() transformers.utils.logging.set_verbosity_error() # Set the verbosity to info of the Transformers logger (on main process only): logger.info(f"Training/evaluation parameters {training_args}") # Get the datasets: you can either provide your own CSV/JSON training and evaluation files (see below) # or just provide the name of one of the public datasets available on the hub at https://huggingface.co/datasets/ # (the dataset will be downloaded automatically from the datasets Hub). # data_files = {} logger.warning(f"Datasets path have been manually hardcoded") # TODO: remove it later, convenient for now if data_args.train_file is not None: data_files["train"] = ["/data/CC3M/training-encoded.tsv", "/data/CC12M/encoded-train.tsv"] if data_args.validation_file is not None: data_files["validation"] = ["/data/CC3M/validation-encoded.tsv"] if data_args.test_file is not None: data_files["test"] = data_args.test_file dataset = load_dataset("csv", data_files=data_files, cache_dir=model_args.cache_dir, delimiter="\t") # See more about loading any type of standard or custom dataset (from files, python dict, pandas DataFrame, etc) at # https://huggingface.co/docs/datasets/loading_datasets.html. # Load pretrained model and tokenizer base_model = FlaxAutoModelForSeq2SeqLM.from_pretrained( model_args.model_name_or_path, seed=training_args.seed, dtype=getattr(jnp, model_args.dtype) ) tokenizer = AutoTokenizer.from_pretrained( model_args.model_name_or_path, cache_dir=model_args.cache_dir, use_fast=model_args.use_fast_tokenizer ) # Set up our new model config config = BartConfig.from_pretrained(model_args.model_name_or_path) config.tie_word_embeddings = False config.decoder_start_token_id = BOS_TOKEN_ID config.bos_token_id = BOS_TOKEN_ID # should not be used config.pos_token_id = BOS_TOKEN_ID # should not be needed (as we generate until max_length) config.eos_token_id = BOS_TOKEN_ID + 1 # unreachable config.forced_bos_token_id = None # we don't need this token config.forced_eos_token_id = None # we don't need this token #config.min_length = data_args.max_target_length # Set only in decoder? #config.max_length = data_args.max_target_length # Set only in decoder? print(f"TPUs: {jax.device_count()}") assert jax.device_count() == 8, "TPUs in use, please check running processes" # Create a custom model and initialize it randomly model = CustomFlaxBartForConditionalGeneration(config, seed=training_args.seed, dtype=getattr(jnp, model_args.dtype)) # Use pre-trained weights for encoder model.params['model']['encoder'] = base_model.params['model']['encoder'] model.params['model']['shared'] = base_model.params['model']['shared'] del base_model prefix = data_args.source_prefix if data_args.source_prefix is not None else "" # Preprocessing the datasets. # We need to tokenize inputs and targets. if training_args.do_train: column_names = dataset["train"].column_names elif training_args.do_eval: column_names = dataset["validation"].column_names elif training_args.do_predict: column_names = dataset["test"].column_names else: logger.info("There is nothing to do. Please pass `do_train`, `do_eval` and/or `do_predict`.") return # Get the column names for input/target. text_column = data_args.text_column encoding_column = data_args.encoding_column # Temporarily set max_target_length for training. max_target_length = data_args.max_target_length def shift_tokens_right(input_ids: np.array, decoder_start_token_id: int): """ Shift input ids one token to the right. """ shifted_input_ids = np.zeros(input_ids.shape) shifted_input_ids[:, 1:] = input_ids[:, :-1] shifted_input_ids[:, 0] = decoder_start_token_id return shifted_input_ids def preprocess_function(examples): inputs = examples[text_column] inputs = [prefix + inp for inp in inputs] # Setting padding="max_length" as we need fixed length inputs for jitted functions model_inputs = tokenizer( inputs, max_length=data_args.max_source_length, padding="max_length", truncation=True, return_tensors="np" ) # set up targets # Note: labels correspond to our target indices # decoder input ids are the same but shifted to the right with bos at the beginning (and without last token) labels = [eval(indices) for indices in examples['encoding']] labels = np.asarray(labels) # We need the labels, in addition to the decoder_input_ids, for the compute_loss function model_inputs["labels"] = labels # In our case, this prepends the bos token and removes the last one decoder_input_ids = shift_tokens_right(labels, config.decoder_start_token_id) model_inputs["decoder_input_ids"] = decoder_input_ids return model_inputs if training_args.do_train: if "train" not in dataset: raise ValueError("--do_train requires a train dataset") train_dataset = dataset["train"] if data_args.max_train_samples is not None: train_dataset = train_dataset.select(range(data_args.max_train_samples)) train_dataset = train_dataset.map( preprocess_function, batched=True, num_proc=data_args.preprocessing_num_workers, remove_columns=column_names, load_from_cache_file=not data_args.overwrite_cache, desc="Running tokenizer on train dataset", ) if training_args.do_eval: max_target_length = data_args.val_max_target_length if "validation" not in dataset: raise ValueError("--do_eval requires a validation dataset") eval_dataset = dataset["validation"] if data_args.max_eval_samples is not None: eval_dataset = eval_dataset.select(range(data_args.max_eval_samples)) eval_dataset = eval_dataset.map( preprocess_function, batched=True, num_proc=data_args.preprocessing_num_workers, remove_columns=column_names, load_from_cache_file=not data_args.overwrite_cache, desc="Running tokenizer on validation dataset", ) if training_args.do_predict: max_target_length = data_args.val_max_target_length if "test" not in dataset: raise ValueError("--do_predict requires a test dataset") predict_dataset = dataset["test"] if data_args.max_predict_samples is not None: predict_dataset = predict_dataset.select(range(data_args.max_predict_samples)) predict_dataset = predict_dataset.map( preprocess_function, batched=True, num_proc=data_args.preprocessing_num_workers, remove_columns=column_names, load_from_cache_file=not data_args.overwrite_cache, desc="Running tokenizer on prediction dataset", ) # Metric #metric = load_metric("rouge") def postprocess_text(preds, labels): preds = [pred.strip() for pred in preds] labels = [label.strip() for label in labels] # rougeLSum expects newline after each sentence preds = ["\n".join(nltk.sent_tokenize(pred)) for pred in preds] labels = ["\n".join(nltk.sent_tokenize(label)) for label in labels] return preds, labels def compute_metrics(preds, labels): decoded_preds = tokenizer.batch_decode(preds, skip_special_tokens=True) decoded_labels = tokenizer.batch_decode(labels, skip_special_tokens=True) # Some simple post-processing decoded_preds, decoded_labels = postprocess_text(decoded_preds, decoded_labels) result = metric.compute(predictions=decoded_preds, references=decoded_labels, use_stemmer=True) # Extract a few results from ROUGE result = {key: value.mid.fmeasure * 100 for key, value in result.items()} prediction_lens = [np.count_nonzero(pred != tokenizer.pad_token_id) for pred in preds] result["gen_len"] = np.mean(prediction_lens) result = {k: round(v, 4) for k, v in result.items()} return result # Initialize our training rng = jax.random.PRNGKey(training_args.seed) rng, dropout_rng = jax.random.split(rng) # Store some constant num_epochs = int(training_args.num_train_epochs) train_batch_size = int(training_args.per_device_train_batch_size) * jax.device_count() total_batch_size = int(train_batch_size) * training_args.gradient_accumulation_steps eval_batch_size = int(training_args.per_device_eval_batch_size) * jax.device_count() steps_per_epoch = len(train_dataset) // train_batch_size total_steps = steps_per_epoch * num_epochs total_optimization_steps = (len(train_dataset) // total_batch_size) * num_epochs # Create learning rate schedule linear_decay_lr_schedule_fn = create_learning_rate_fn( len(train_dataset), total_batch_size, training_args.num_train_epochs, training_args.warmup_steps, training_args.learning_rate, data_args.no_decay ) # We use Optax's "masking" functionality to not apply weight decay # to bias and LayerNorm scale parameters. decay_mask_fn returns a # mask boolean with the same structure as the parameters. # The mask is True for parameters that should be decayed. # Note that this mask is specifically adapted for FlaxBart. # For FlaxT5, one should correct the layer norm parameter naming # accordingly - see `run_t5_mlm_flax.py` e.g. def decay_mask_fn(params): flat_params = traverse_util.flatten_dict(params) layer_norm_params = [ (name, "scale") for name in ["self_attn_layer_norm", "layernorm_embedding", "final_layer_norm"] ] flat_mask = {path: (path[-1] != "bias" and path[-2:] not in layer_norm_params) for path in flat_params} return traverse_util.unflatten_dict(flat_mask) # create adam optimizer if training_args.adafactor: # We use the default parameters here to initialize adafactor, # For more details about the parameters please check https://github.com/deepmind/optax/blob/ed02befef9bf81cbbf236be3d2b0e032e9ed4a40/optax/_src/alias.py#L74 optimizer = optax.adafactor( learning_rate=linear_decay_lr_schedule_fn, ) else: optimizer = optax.adamw( learning_rate=linear_decay_lr_schedule_fn, b1=training_args.adam_beta1, b2=training_args.adam_beta2, eps=training_args.adam_epsilon, weight_decay=training_args.weight_decay, mask=decay_mask_fn, ) # Setup train state state = TrainState.create( apply_fn=model.__call__, params=model.params, tx=optimizer, dropout_rng=dropout_rng, grad_accum=jax.tree_map(jnp.zeros_like, model.params), optimizer_step=0, ) # label smoothed cross entropy def loss_fn(logits, labels): loss = optax.softmax_cross_entropy(logits, onehot(labels, logits.shape[-1])) loss = loss.mean() return loss # Define gradient update step fn def train_step(state, batch): dropout_rng, new_dropout_rng = jax.random.split(state.dropout_rng) def compute_loss(params): labels = batch.pop("labels") logits = state.apply_fn(**batch, params=params, dropout_rng=dropout_rng, train=True)[0] loss = loss_fn(logits, labels) return loss grad_fn = jax.value_and_grad(compute_loss) loss, grads = grad_fn(state.params) grad_accum = jax.tree_multimap(lambda x, y: x + y, grads, state.grad_accum) def update_fn(): grads = jax.tree_map(lambda x: x / training_args.gradient_accumulation_steps, grad_accum) grads = jax.lax.pmean(grads, "batch") new_state = state.apply_gradients( grads=grads, grad_accum=jax.tree_map(jnp.zeros_like, grads), optimizer_step=state.optimizer_step + 1 ) return new_state new_state = jax.lax.cond( (state.step + 1) % training_args.gradient_accumulation_steps == 0, lambda _: update_fn(), lambda _: state.replace(grad_accum=grad_accum, step=state.step + 1), None, ) metrics = {"loss": loss, "learning_rate": linear_decay_lr_schedule_fn(state.optimizer_step)} metrics = jax.lax.pmean(metrics, axis_name="batch") return new_state.replace(dropout_rng=new_dropout_rng), metrics # Define eval fn def eval_step(params, batch): labels = batch.pop("labels") logits = model(**batch, params=params, train=False)[0] loss = loss_fn(logits, labels) # summarize metrics metrics = {"loss": loss} metrics = jax.lax.pmean(metrics, axis_name="batch") return metrics # Define generation function max_length = ( data_args.val_max_target_length if data_args.val_max_target_length is not None else model.config.max_length ) num_beams = data_args.num_beams if data_args.num_beams is not None else model.config.num_beams gen_kwargs = {"max_length": max_length, "num_beams": num_beams} def generate_step(params, batch): model.params = params output_ids = model.generate(batch["input_ids"], attention_mask=batch["attention_mask"], **gen_kwargs) return output_ids.sequences # Create parallel version of the train and eval step p_train_step = jax.pmap( train_step, "batch", donate_argnums=(0,) ) p_eval_step = jax.pmap(eval_step, "batch") p_generate_step = jax.pmap(generate_step, "batch") # Replicate the train state on each device state = state.replicate() logger.info("***** Running training *****") logger.info(f" Num examples = {len(train_dataset)}") logger.info(f" Num Epochs = {num_epochs}") logger.info(f" Instantaneous batch size per device = {training_args.per_device_train_batch_size}") logger.info( f" Total train batch size (w. parallel & distributed) = {train_batch_size * training_args.gradient_accumulation_steps}" ) logger.info(f" Total global steps = {total_steps}") logger.info(f" Total optimization steps = {total_optimization_steps}") train_time = 0 epochs = tqdm(range(num_epochs), desc=f"Epoch ... (1/{num_epochs})", position=0) global_step = 0 def run_evaluation(): # ======================== Evaluating ============================== eval_metrics = [] if training_args.do_eval: eval_preds = [] eval_labels = [] eval_loader = data_loader(input_rng, eval_dataset, eval_batch_size) eval_steps = len(eval_dataset) // eval_batch_size for _ in tqdm(range(eval_steps), desc="Evaluating...", position=2, leave=False): # Model forward batch = next(eval_loader) labels = batch["labels"] metrics = p_eval_step(state.params, batch) eval_metrics.append(metrics) # generation if data_args.predict_with_generate: generated_ids = p_generate_step(state.params, batch) eval_preds.extend(jax.device_get(generated_ids.reshape(-1, gen_kwargs["max_length"]))) eval_labels.extend(jax.device_get(labels.reshape(-1, labels.shape[-1]))) # normalize eval metrics eval_metrics = get_metrics(eval_metrics) eval_metrics = jax.tree_map(jnp.mean, eval_metrics) # log metrics wandb_log(eval_metrics, step=global_step, prefix='eval') # compute ROUGE metrics rouge_desc = "" # if data_args.predict_with_generate: # rouge_metrics = compute_metrics(eval_preds, eval_labels) # eval_metrics.update(rouge_metrics) # rouge_desc = " ".join([f"Eval {key}: {value} |" for key, value in rouge_metrics.items()]) # Print metrics and update progress bar desc = f"Epoch... ({epoch + 1}/{num_epochs} | Eval Loss: {eval_metrics['loss']} | {rouge_desc})" epochs.write(desc) epochs.desc = desc return eval_metrics for epoch in epochs: # ======================== Training ================================ train_start = time.time() # Create sampling rng rng, input_rng = jax.random.split(rng) # Generate an epoch by shuffling sampling indices from the train dataset train_loader = data_loader(input_rng, train_dataset, train_batch_size, shuffle=True) steps_per_epoch = len(train_dataset) // train_batch_size # train for step in tqdm(range(steps_per_epoch), desc="Training...", position=1, leave=False): global_step +=1 batch = next(train_loader) state, train_metric = p_train_step(state, batch) if global_step % data_args.log_interval == 0 and jax.process_index() == 0: # log metrics wandb_log(unreplicate(train_metric), step=global_step, prefix='train') if global_step % training_args.eval_steps == 0: run_evaluation() if global_step % training_args.save_model_steps == 0: run_save_model(global_step, epoch) # log final train metrics wandb_log(unreplicate(train_metric), step=global_step, prefix='train') train_time += time.time() - train_start train_metric = unreplicate(train_metric) epochs.write( f"Epoch... ({epoch + 1}/{num_epochs} | Loss: {train_metric['loss']}, Learning Rate: {train_metric['learning_rate']})" ) # Final evaluation eval_metrics = run_evaluation() # save checkpoint after each epoch and push checkpoint to the hub run_save_model(global_step, epoch, eval_metrics) def run_save_model(step, epoch, eval_metrics=None): if jax.process_index() == 0: params = jax.device_get(jax.tree_map(lambda x: x[0], state.params)) # save model locally model.save_pretrained( training_args.output_dir, params=params, ) # save to W&B if data_args.log_model: metadata = {'epoch': epoch+1, 'eval/loss': eval_metrics['loss']} if eval_metrics is not None: metadata['eval/loss'] = eval_metrics['loss'] artifact = wandb.Artifact( name=f"model-{wandb.run.id}", type="bart_model", metadata=metadata ) artifact.add_file(str(Path(training_args.output_dir) / 'flax_model.msgpack')) artifact.add_file(str(Path(training_args.output_dir) / 'config.json')) wandb.run.log_artifact(artifact) # save to the hub if training_args.push_to_hub: model.save_pretrained( training_args.output_dir, params=params, push_to_hub=training_args.push_to_hub, commit_message=f"Saving weights and logs of epoch {epoch+1}", temp_dir=True # avoid issues with being in a repository ) # ======================== Prediction loop ============================== if training_args.do_predict: logger.info("*** Predict ***") pred_metrics = [] pred_generations = [] pred_labels = [] pred_loader = data_loader(input_rng, predict_dataset, eval_batch_size) pred_steps = len(predict_dataset) // eval_batch_size for _ in tqdm(range(pred_steps), desc="Predicting...", position=2, leave=False): # Model forward batch = next(pred_loader) labels = batch["labels"] metrics = p_eval_step(state.params, batch) pred_metrics.append(metrics) # generation if data_args.predict_with_generate: generated_ids = p_generate_step(state.params, batch) pred_generations.extend(jax.device_get(generated_ids.reshape(-1, gen_kwargs["max_length"]))) pred_labels.extend(jax.device_get(labels.reshape(-1, labels.shape[-1]))) # normalize prediction metrics pred_metrics = get_metrics(pred_metrics) pred_metrics = jax.tree_map(jnp.mean, pred_metrics) # compute ROUGE metrics rouge_desc = "" if data_args.predict_with_generate: rouge_metrics = compute_metrics(pred_generations, pred_labels) pred_metrics.update(rouge_metrics) rouge_desc = " ".join([f"Predict {key}: {value} |" for key, value in rouge_metrics.items()]) # Print metrics desc = f"Predict Loss: {pred_metrics['loss']} | {rouge_desc})" logger.info(desc) if __name__ == "__main__": main()