mirror of
https://github.com/huggingface/transformers.git
synced 2025-07-14 01:58:22 +06:00
420 lines
17 KiB
Python
420 lines
17 KiB
Python
import argparse
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import glob
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import logging
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import os
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import time
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import warnings
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from collections import defaultdict
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from pathlib import Path
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from typing import Dict, List, Tuple
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import numpy as np
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import pytorch_lightning as pl
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import torch
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from packaging import version
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from torch.utils.data import DataLoader
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from lightning_base import BaseTransformer, add_generic_args, generic_train
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from transformers import MBartTokenizer, T5ForConditionalGeneration
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from transformers.modeling_bart import shift_tokens_right
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try:
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from .callbacks import Seq2SeqLoggingCallback, get_checkpoint_callback, get_early_stopping_callback
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from .utils import (
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ROUGE_KEYS,
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LegacySeq2SeqDataset,
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Seq2SeqDataset,
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assert_all_frozen,
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calculate_bleu,
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calculate_rouge,
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flatten_list,
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freeze_params,
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get_git_info,
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label_smoothed_nll_loss,
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lmap,
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pickle_save,
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save_git_info,
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save_json,
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use_task_specific_params,
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)
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except ImportError:
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from callbacks import Seq2SeqLoggingCallback, get_checkpoint_callback, get_early_stopping_callback
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from utils import (
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ROUGE_KEYS,
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LegacySeq2SeqDataset,
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Seq2SeqDataset,
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assert_all_frozen,
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calculate_bleu,
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calculate_rouge,
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flatten_list,
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freeze_params,
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get_git_info,
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label_smoothed_nll_loss,
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lmap,
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pickle_save,
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save_git_info,
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save_json,
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use_task_specific_params,
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)
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logger = logging.getLogger(__name__)
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class SummarizationModule(BaseTransformer):
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mode = "summarization"
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loss_names = ["loss"]
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metric_names = ROUGE_KEYS
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default_val_metric = "rouge2"
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def __init__(self, hparams, **kwargs):
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super().__init__(hparams, num_labels=None, mode=self.mode, **kwargs)
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use_task_specific_params(self.model, "summarization")
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save_git_info(self.hparams.output_dir)
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self.metrics_save_path = Path(self.output_dir) / "metrics.json"
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self.hparams_save_path = Path(self.output_dir) / "hparams.pkl"
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pickle_save(self.hparams, self.hparams_save_path)
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self.step_count = 0
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self.metrics = defaultdict(list)
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self.dataset_kwargs: dict = dict(
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data_dir=self.hparams.data_dir,
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max_source_length=self.hparams.max_source_length,
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prefix=self.model.config.prefix or "",
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)
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n_observations_per_split = {
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"train": self.hparams.n_train,
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"val": self.hparams.n_val,
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"test": self.hparams.n_test,
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}
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self.n_obs = {k: v if v >= 0 else None for k, v in n_observations_per_split.items()}
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self.target_lens = {
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"train": self.hparams.max_target_length,
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"val": self.hparams.val_max_target_length,
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"test": self.hparams.test_max_target_length,
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}
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assert self.target_lens["train"] <= self.target_lens["val"], f"target_lens: {self.target_lens}"
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assert self.target_lens["train"] <= self.target_lens["test"], f"target_lens: {self.target_lens}"
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if self.hparams.freeze_embeds:
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self.freeze_embeds()
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if self.hparams.freeze_encoder:
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freeze_params(self.model.get_encoder())
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assert_all_frozen(self.model.get_encoder())
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self.hparams.git_sha = get_git_info()["repo_sha"]
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self.num_workers = hparams.num_workers
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self.decoder_start_token_id = None # default to config
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if self.model.config.decoder_start_token_id is None and isinstance(self.tokenizer, MBartTokenizer):
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self.decoder_start_token_id = self.tokenizer.lang_code_to_id[hparams.tgt_lang]
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self.model.config.decoder_start_token_id = self.decoder_start_token_id
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self.dataset_class = (
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Seq2SeqDataset if hasattr(self.tokenizer, "prepare_seq2seq_batch") else LegacySeq2SeqDataset
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)
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self.eval_beams = self.model.config.num_beams if self.hparams.eval_beams is None else self.hparams.eval_beams
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assert self.eval_beams >= 1, f"got self.eval_beams={self.eval_beams}. Need an integer > 1"
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self.val_metric = self.default_val_metric if self.hparams.val_metric is None else self.hparams.val_metric
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def freeze_embeds(self):
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"""Freeze token embeddings and positional embeddings for bart, just token embeddings for t5."""
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try:
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freeze_params(self.model.model.shared)
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for d in [self.model.model.encoder, self.model.model.decoder]:
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freeze_params(d.embed_positions)
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freeze_params(d.embed_tokens)
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except AttributeError:
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freeze_params(self.model.shared)
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for d in [self.model.encoder, self.model.decoder]:
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freeze_params(d.embed_tokens)
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def forward(self, input_ids, **kwargs):
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return self.model(input_ids, **kwargs)
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def ids_to_clean_text(self, generated_ids: List[int]):
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gen_text = self.tokenizer.batch_decode(
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generated_ids, skip_special_tokens=True, clean_up_tokenization_spaces=True
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)
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return lmap(str.strip, gen_text)
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def _step(self, batch: dict) -> Tuple:
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pad_token_id = self.tokenizer.pad_token_id
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src_ids, src_mask = batch["input_ids"], batch["attention_mask"]
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tgt_ids = batch["labels"]
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if isinstance(self.model, T5ForConditionalGeneration):
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decoder_input_ids = self.model._shift_right(tgt_ids)
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else:
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decoder_input_ids = shift_tokens_right(tgt_ids, pad_token_id)
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outputs = self(src_ids, attention_mask=src_mask, decoder_input_ids=decoder_input_ids, use_cache=False)
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lm_logits = outputs[0]
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if self.hparams.label_smoothing == 0:
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# Same behavior as modeling_bart.py, besides ignoring pad_token_id
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ce_loss_fct = torch.nn.CrossEntropyLoss(ignore_index=pad_token_id)
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assert lm_logits.shape[-1] == self.model.config.vocab_size
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loss = ce_loss_fct(lm_logits.view(-1, lm_logits.shape[-1]), tgt_ids.view(-1))
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else:
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lprobs = torch.nn.functional.log_softmax(lm_logits, dim=-1)
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loss, nll_loss = label_smoothed_nll_loss(
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lprobs, tgt_ids, self.hparams.label_smoothing, ignore_index=pad_token_id
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)
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return (loss,)
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@property
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def pad(self) -> int:
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return self.tokenizer.pad_token_id
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def training_step(self, batch, batch_idx) -> Dict:
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loss_tensors = self._step(batch)
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logs = {name: loss for name, loss in zip(self.loss_names, loss_tensors)}
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# tokens per batch
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logs["tpb"] = batch["input_ids"].ne(self.pad).sum() + batch["labels"].ne(self.pad).sum()
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return {"loss": loss_tensors[0], "log": logs}
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def validation_step(self, batch, batch_idx) -> Dict:
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return self._generative_step(batch)
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def validation_epoch_end(self, outputs, prefix="val") -> Dict:
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self.step_count += 1
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losses = {k: torch.stack([x[k] for x in outputs]).mean() for k in self.loss_names}
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loss = losses["loss"]
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generative_metrics = {
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k: np.array([x[k] for x in outputs]).mean() for k in self.metric_names + ["gen_time", "gen_len"]
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}
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metric_val = (
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generative_metrics[self.val_metric] if self.val_metric in generative_metrics else losses[self.val_metric]
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)
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metric_tensor: torch.FloatTensor = torch.tensor(metric_val).type_as(loss)
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generative_metrics.update({k: v.item() for k, v in losses.items()})
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losses.update(generative_metrics)
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all_metrics = {f"{prefix}_avg_{k}": x for k, x in losses.items()}
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all_metrics["step_count"] = self.step_count
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self.save_metrics(all_metrics, prefix) # writes to self.metrics_save_path
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preds = flatten_list([x["preds"] for x in outputs])
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return {
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"log": all_metrics,
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"preds": preds,
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f"{prefix}_loss": loss,
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f"{prefix}_{self.val_metric}": metric_tensor,
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}
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def save_metrics(self, latest_metrics, type_path) -> None:
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self.metrics[type_path].append(latest_metrics)
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save_json(self.metrics, self.metrics_save_path)
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def calc_generative_metrics(self, preds, target) -> Dict:
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return calculate_rouge(preds, target)
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def _generative_step(self, batch: dict) -> dict:
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t0 = time.time()
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generated_ids = self.model.generate(
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batch["input_ids"],
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attention_mask=batch["attention_mask"],
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use_cache=True,
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decoder_start_token_id=self.decoder_start_token_id,
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num_beams=self.eval_beams,
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)
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gen_time = (time.time() - t0) / batch["input_ids"].shape[0]
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preds: List[str] = self.ids_to_clean_text(generated_ids)
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target: List[str] = self.ids_to_clean_text(batch["labels"])
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loss_tensors = self._step(batch)
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base_metrics = {name: loss for name, loss in zip(self.loss_names, loss_tensors)}
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rouge: Dict = self.calc_generative_metrics(preds, target)
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summ_len = np.mean(lmap(len, generated_ids))
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base_metrics.update(gen_time=gen_time, gen_len=summ_len, preds=preds, target=target, **rouge)
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return base_metrics
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def test_step(self, batch, batch_idx):
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return self._generative_step(batch)
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def test_epoch_end(self, outputs):
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return self.validation_epoch_end(outputs, prefix="test")
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def get_dataset(self, type_path) -> Seq2SeqDataset:
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n_obs = self.n_obs[type_path]
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max_target_length = self.target_lens[type_path]
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dataset = self.dataset_class(
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self.tokenizer,
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type_path=type_path,
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n_obs=n_obs,
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max_target_length=max_target_length,
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**self.dataset_kwargs,
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)
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return dataset
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def get_dataloader(self, type_path: str, batch_size: int, shuffle: bool = False) -> DataLoader:
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dataset = self.get_dataset(type_path)
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sampler = None
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if self.hparams.sortish_sampler and type_path == "train":
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assert self.hparams.gpus <= 1 # TODO: assert earlier
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sampler = dataset.make_sortish_sampler(batch_size)
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shuffle = False
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dataloader = DataLoader(
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dataset,
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batch_size=batch_size,
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collate_fn=dataset.collate_fn,
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shuffle=shuffle,
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num_workers=self.num_workers,
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sampler=sampler,
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)
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return dataloader
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def train_dataloader(self) -> DataLoader:
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dataloader = self.get_dataloader("train", batch_size=self.hparams.train_batch_size, shuffle=True)
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return dataloader
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def val_dataloader(self) -> DataLoader:
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return self.get_dataloader("val", batch_size=self.hparams.eval_batch_size)
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def test_dataloader(self) -> DataLoader:
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return self.get_dataloader("test", batch_size=self.hparams.eval_batch_size)
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@staticmethod
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def add_model_specific_args(parser, root_dir):
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BaseTransformer.add_model_specific_args(parser, root_dir)
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add_generic_args(parser, root_dir)
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parser.add_argument(
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"--max_source_length",
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default=1024,
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type=int,
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help="The maximum total input sequence length after tokenization. Sequences longer "
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"than this will be truncated, sequences shorter will be padded.",
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)
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parser.add_argument(
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"--max_target_length",
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default=56,
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type=int,
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help="The maximum total input sequence length after tokenization. Sequences longer "
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"than this will be truncated, sequences shorter will be padded.",
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)
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parser.add_argument(
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"--val_max_target_length",
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default=142, # these defaults are optimized for CNNDM. For xsum, see README.md.
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type=int,
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help="The maximum total input sequence length after tokenization. Sequences longer "
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"than this will be truncated, sequences shorter will be padded.",
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)
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parser.add_argument(
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"--test_max_target_length",
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default=142,
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type=int,
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help="The maximum total input sequence length after tokenization. Sequences longer "
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"than this will be truncated, sequences shorter will be padded.",
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)
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parser.add_argument("--freeze_encoder", action="store_true")
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parser.add_argument("--freeze_embeds", action="store_true")
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parser.add_argument("--sortish_sampler", action="store_true", default=False)
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parser.add_argument("--logger_name", type=str, choices=["default", "wandb", "wandb_shared"], default="default")
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parser.add_argument("--n_train", type=int, default=-1, required=False, help="# examples. -1 means use all.")
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parser.add_argument("--n_val", type=int, default=500, required=False, help="# examples. -1 means use all.")
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parser.add_argument("--n_test", type=int, default=-1, required=False, help="# examples. -1 means use all.")
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parser.add_argument(
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"--task", type=str, default="summarization", required=False, help="# examples. -1 means use all."
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)
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parser.add_argument("--label_smoothing", type=float, default=0.0, required=False)
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parser.add_argument("--src_lang", type=str, default="", required=False)
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parser.add_argument("--tgt_lang", type=str, default="", required=False)
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parser.add_argument("--eval_beams", type=int, default=None, required=False)
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parser.add_argument(
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"--val_metric", type=str, default=None, required=False, choices=["bleu", "rouge2", "loss", None]
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)
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parser.add_argument("--save_top_k", type=int, default=1, required=False, help="How many checkpoints to save")
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parser.add_argument(
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"--early_stopping_patience",
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type=int,
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default=-1,
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required=False,
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help="-1 means never early stop. early_stopping_patience is measured in validation checks, not epochs. So val_check_interval will effect it.",
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)
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return parser
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class TranslationModule(SummarizationModule):
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mode = "translation"
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loss_names = ["loss"]
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metric_names = ["bleu"]
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default_val_metric = "bleu"
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def __init__(self, hparams, **kwargs):
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super().__init__(hparams, **kwargs)
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self.dataset_kwargs["src_lang"] = hparams.src_lang
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self.dataset_kwargs["tgt_lang"] = hparams.tgt_lang
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def calc_generative_metrics(self, preds, target) -> dict:
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return calculate_bleu(preds, target)
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def main(args, model=None) -> SummarizationModule:
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Path(args.output_dir).mkdir(exist_ok=True)
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if len(os.listdir(args.output_dir)) > 3 and args.do_train:
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raise ValueError("Output directory ({}) already exists and is not empty.".format(args.output_dir))
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if model is None:
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if "summarization" in args.task:
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model: SummarizationModule = SummarizationModule(args)
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else:
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model: SummarizationModule = TranslationModule(args)
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if version.parse(torch.__version__) == version.parse("1.6") and args.fp16:
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warnings.warn("FP16 only seems to work with torch 1.5+apex")
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dataset = Path(args.data_dir).name
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if (
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args.logger_name == "default"
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or args.fast_dev_run
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or str(args.output_dir).startswith("/tmp")
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or str(args.output_dir).startswith("/var")
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):
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logger = True # don't pollute wandb logs unnecessarily
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elif args.logger_name == "wandb":
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from pytorch_lightning.loggers import WandbLogger
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project = os.environ.get("WANDB_PROJECT", dataset)
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logger = WandbLogger(name=model.output_dir.name, project=project)
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elif args.logger_name == "wandb_shared":
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from pytorch_lightning.loggers import WandbLogger
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logger = WandbLogger(name=model.output_dir.name, project=f"hf_{dataset}")
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if args.early_stopping_patience >= 0:
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es_callback = get_early_stopping_callback(model.val_metric, args.early_stopping_patience)
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else:
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es_callback = False
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lower_is_better = args.val_metric == "loss"
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trainer: pl.Trainer = generic_train(
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model,
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args,
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logging_callback=Seq2SeqLoggingCallback(),
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checkpoint_callback=get_checkpoint_callback(
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args.output_dir, model.val_metric, args.save_top_k, lower_is_better
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),
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early_stopping_callback=es_callback,
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logger=logger,
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)
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pickle_save(model.hparams, model.output_dir / "hparams.pkl")
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if not args.do_predict:
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return model
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model.hparams.test_checkpoint = ""
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checkpoints = list(sorted(glob.glob(os.path.join(args.output_dir, "*.ckpt"), recursive=True)))
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if checkpoints:
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model.hparams.test_checkpoint = checkpoints[-1]
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trainer.resume_from_checkpoint = checkpoints[-1]
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trainer.logger.log_hyperparams(model.hparams)
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# test() without a model tests using the best checkpoint automatically
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trainer.test()
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return model
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if __name__ == "__main__":
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parser = argparse.ArgumentParser()
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parser = pl.Trainer.add_argparse_args(parser)
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parser = SummarizationModule.add_model_specific_args(parser, os.getcwd())
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args = parser.parse_args()
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main(args)
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