mirror of
https://github.com/huggingface/transformers.git
synced 2025-07-06 14:20:04 +06:00
410 lines
14 KiB
Python
410 lines
14 KiB
Python
import itertools
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import json
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import linecache
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import math
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import os
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import pickle
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from logging import getLogger
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from pathlib import Path
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from typing import Callable, Dict, Iterable, List, Union
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import git
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import numpy as np
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import torch
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import torch.distributed as dist
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from rouge_score import rouge_scorer, scoring
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from sacrebleu import corpus_bleu
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from torch import nn
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from torch.utils.data import Dataset, Sampler
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from transformers import BartTokenizer
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from transformers.file_utils import cached_property
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def label_smoothed_nll_loss(lprobs, target, epsilon, ignore_index=-100):
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"""From fairseq"""
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if target.dim() == lprobs.dim() - 1:
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target = target.unsqueeze(-1)
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nll_loss = -lprobs.gather(dim=-1, index=target)
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smooth_loss = -lprobs.sum(dim=-1, keepdim=True)
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if ignore_index is not None:
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pad_mask = target.eq(ignore_index)
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nll_loss.masked_fill_(pad_mask, 0.0)
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smooth_loss.masked_fill_(pad_mask, 0.0)
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else:
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nll_loss = nll_loss.squeeze(-1)
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smooth_loss = smooth_loss.squeeze(-1)
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nll_loss = nll_loss.sum() # mean()? Scared to break other math.
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smooth_loss = smooth_loss.sum()
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eps_i = epsilon / lprobs.size(-1)
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loss = (1.0 - epsilon) * nll_loss + eps_i * smooth_loss
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return loss, nll_loss
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def encode_line(tokenizer, line, max_length, pad_to_max_length=True, return_tensors="pt"):
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"""Only used by LegacyDataset"""
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extra_kw = {"add_prefix_space": True} if isinstance(tokenizer, BartTokenizer) else {}
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return tokenizer(
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[line],
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max_length=max_length,
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padding="max_length" if pad_to_max_length else None,
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truncation=True,
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return_tensors=return_tensors,
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**extra_kw,
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)
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def lmap(f: Callable, x: Iterable) -> List:
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"""list(map(f, x))"""
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return list(map(f, x))
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def calculate_bleu(output_lns, refs_lns, **kwargs) -> dict:
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"""Uses sacrebleu's corpus_bleu implementation."""
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return {"bleu": round(corpus_bleu(output_lns, [refs_lns], **kwargs).score, 4)}
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def trim_batch(
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input_ids,
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pad_token_id,
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attention_mask=None,
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):
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"""Remove columns that are populated exclusively by pad_token_id"""
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keep_column_mask = input_ids.ne(pad_token_id).any(dim=0)
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if attention_mask is None:
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return input_ids[:, keep_column_mask]
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else:
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return (input_ids[:, keep_column_mask], attention_mask[:, keep_column_mask])
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class AbstractSeq2SeqDataset(Dataset):
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def __init__(
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self,
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tokenizer,
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data_dir,
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max_source_length,
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max_target_length,
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type_path="train",
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n_obs=None,
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src_lang=None,
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tgt_lang=None,
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prefix="",
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):
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super().__init__()
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self.src_file = Path(data_dir).joinpath(type_path + ".source")
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self.tgt_file = Path(data_dir).joinpath(type_path + ".target")
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self.src_lens = self.get_char_lens(self.src_file)
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self.max_source_length = max_source_length
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self.max_target_length = max_target_length
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assert min(self.src_lens) > 0, f"found empty line in {self.src_file}"
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self.tokenizer = tokenizer
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self.prefix = prefix if prefix is not None else ""
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if n_obs is not None:
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self.src_lens = self.src_lens[:n_obs]
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self.pad_token_id = self.tokenizer.pad_token_id
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self.src_lang = src_lang
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self.tgt_lang = tgt_lang
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self.add_prefix_space = isinstance(self.tokenizer, BartTokenizer)
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def __len__(self):
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return len(self.src_lens)
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@staticmethod
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def get_char_lens(data_file):
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return [len(x) for x in Path(data_file).open().readlines()]
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def make_sortish_sampler(self, batch_size, distributed=False, **kwargs):
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if distributed:
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return DistributedSortishSampler(self, batch_size, **kwargs)
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else:
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return SortishSampler(self.src_lens, batch_size)
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def __getitem__(self, item):
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raise NotImplementedError("You must implement this")
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def collate_fn(self, batch):
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raise NotImplementedError("You must implement this")
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class LegacySeq2SeqDataset(AbstractSeq2SeqDataset):
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def __getitem__(self, index) -> Dict[str, torch.Tensor]:
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"""Call tokenizer on src and tgt_lines"""
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index = index + 1 # linecache starts at 1
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source_line = self.prefix + linecache.getline(str(self.src_file), index).rstrip("\n")
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tgt_line = linecache.getline(str(self.tgt_file), index).rstrip("\n")
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assert source_line, f"empty source line for index {index}"
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assert tgt_line, f"empty tgt line for index {index}"
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source_inputs = encode_line(self.tokenizer, source_line, self.max_source_length)
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target_inputs = encode_line(self.tokenizer, tgt_line, self.max_target_length)
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source_ids = source_inputs["input_ids"].squeeze()
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target_ids = target_inputs["input_ids"].squeeze()
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src_mask = source_inputs["attention_mask"].squeeze()
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return {
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"input_ids": source_ids,
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"attention_mask": src_mask,
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"labels": target_ids,
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}
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def collate_fn(self, batch) -> Dict[str, torch.Tensor]:
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input_ids = torch.stack([x["input_ids"] for x in batch])
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masks = torch.stack([x["attention_mask"] for x in batch])
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target_ids = torch.stack([x["labels"] for x in batch])
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pad_token_id = self.pad_token_id
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y = trim_batch(target_ids, pad_token_id)
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source_ids, source_mask = trim_batch(input_ids, pad_token_id, attention_mask=masks)
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batch = {
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"input_ids": source_ids,
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"attention_mask": source_mask,
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"labels": y,
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}
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return batch
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class Seq2SeqDataset(AbstractSeq2SeqDataset):
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"""A dataset that calls prepare_seq2seq_batch."""
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def __getitem__(self, index) -> Dict[str, str]:
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index = index + 1 # linecache starts at 1
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source_line = self.prefix + linecache.getline(str(self.src_file), index).rstrip("\n")
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tgt_line = linecache.getline(str(self.tgt_file), index).rstrip("\n")
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assert source_line, f"empty source line for index {index}"
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assert tgt_line, f"empty tgt line for index {index}"
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return {"tgt_texts": tgt_line, "src_texts": source_line, "id": index - 1}
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def collate_fn(self, batch) -> Dict[str, torch.Tensor]:
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"""Call prepare_seq2seq_batch."""
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batch_encoding: Dict[str, torch.Tensor] = self.tokenizer.prepare_seq2seq_batch(
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[x["src_texts"] for x in batch],
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src_lang=self.src_lang,
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tgt_texts=[x["tgt_texts"] for x in batch],
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tgt_lang=self.tgt_lang,
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max_length=self.max_source_length,
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max_target_length=self.max_target_length,
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return_tensors="pt",
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add_prefix_space=self.add_prefix_space,
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).data
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batch_encoding["ids"] = torch.tensor([x["id"] for x in batch])
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return batch_encoding
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class SortishSampler(Sampler):
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"Go through the text data by order of src length with a bit of randomness. From fastai repo."
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def __init__(self, data, batch_size):
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self.data, self.bs = data, batch_size
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def __len__(self) -> int:
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return len(self.data)
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def __iter__(self):
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return iter(sortish_sampler_indices(self.data, self.bs))
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def sortish_sampler_indices(data: List, bs: int) -> np.array:
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"Go through the text data by order of src length with a bit of randomness. From fastai repo."
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def key_fn(i):
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return data[i]
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idxs = np.random.permutation(len(data))
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sz = bs * 50
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ck_idx = [idxs[i : i + sz] for i in range(0, len(idxs), sz)]
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sort_idx = np.concatenate([sorted(s, key=key_fn, reverse=True) for s in ck_idx])
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sz = bs
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ck_idx = [sort_idx[i : i + sz] for i in range(0, len(sort_idx), sz)]
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max_ck = np.argmax([key_fn(ck[0]) for ck in ck_idx]) # find the chunk with the largest key,
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ck_idx[0], ck_idx[max_ck] = ck_idx[max_ck], ck_idx[0] # then make sure it goes first.
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sort_idx = np.concatenate(np.random.permutation(ck_idx[1:])) if len(ck_idx) > 1 else np.array([], dtype=np.int)
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sort_idx = np.concatenate((ck_idx[0], sort_idx))
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return sort_idx
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class DistributedSortishSampler(Sampler):
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"""Copied from torch DistributedSampler"""
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def __init__(self, dataset, batch_size, num_replicas=None, rank=None, add_extra_examples=True):
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if num_replicas is None:
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if not dist.is_available():
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raise RuntimeError("Requires distributed package to be available")
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num_replicas = dist.get_world_size()
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if rank is None:
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if not dist.is_available():
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raise RuntimeError("Requires distributed package to be available")
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rank = dist.get_rank()
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self.dataset = dataset
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self.num_replicas = num_replicas
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self.rank = rank
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self.epoch = 0
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if add_extra_examples:
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self.num_samples = int(math.ceil(len(self.dataset) * 1.0 / self.num_replicas))
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self.total_size = self.num_samples * self.num_replicas
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else:
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self.total_size = len(dataset)
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self.num_samples = len(self.available_indices)
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self.batch_size = batch_size
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self.add_extra_examples = add_extra_examples
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def __iter__(self) -> Iterable:
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g = torch.Generator()
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g.manual_seed(self.epoch)
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sortish_data = [self.dataset.src_lens[i] for i in self.available_indices]
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sortish_indices = sortish_sampler_indices(sortish_data, self.batch_size)
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indices = [self.available_indices[i] for i in sortish_indices]
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assert len(indices) == self.num_samples
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return iter(indices)
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@cached_property
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def available_indices(self) -> np.array:
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indices = list(range(len(self.dataset)))
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# add extra samples to make it evenly divisible
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indices += indices[: (self.total_size - len(indices))]
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assert len(indices) == self.total_size
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# subsample
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available_indices = indices[self.rank : self.total_size : self.num_replicas]
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return available_indices
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def __len__(self):
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return self.num_samples
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def set_epoch(self, epoch):
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self.epoch = epoch
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logger = getLogger(__name__)
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def use_task_specific_params(model, task):
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"""Update config with summarization specific params."""
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task_specific_params = model.config.task_specific_params
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if task_specific_params is not None:
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pars = task_specific_params.get(task, {})
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logger.info(f"using task specific params for {task}: {pars}")
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model.config.update(pars)
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def pickle_load(path):
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"""pickle.load(path)"""
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with open(path, "rb") as f:
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return pickle.load(f)
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def pickle_save(obj, path):
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"""pickle.dump(obj, path)"""
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with open(path, "wb") as f:
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return pickle.dump(obj, f)
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def flatten_list(summary_ids: List[List]):
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return [x for x in itertools.chain.from_iterable(summary_ids)]
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def save_git_info(folder_path: str) -> None:
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"""Save git information to output_dir/git_log.json"""
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repo_infos = get_git_info()
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save_json(repo_infos, os.path.join(folder_path, "git_log.json"))
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def save_json(content, path):
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with open(path, "w") as f:
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json.dump(content, f, indent=4)
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def load_json(path):
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with open(path) as f:
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return json.load(f)
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def get_git_info():
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repo = git.Repo(search_parent_directories=True)
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repo_infos = {
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"repo_id": str(repo),
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"repo_sha": str(repo.head.object.hexsha),
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"repo_branch": str(repo.active_branch),
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}
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return repo_infos
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ROUGE_KEYS = ["rouge1", "rouge2", "rougeL"]
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def calculate_rouge(output_lns: List[str], reference_lns: List[str], use_stemmer=True) -> Dict:
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scorer = rouge_scorer.RougeScorer(ROUGE_KEYS, use_stemmer=use_stemmer)
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aggregator = scoring.BootstrapAggregator()
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for reference_ln, output_ln in zip(reference_lns, output_lns):
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scores = scorer.score(reference_ln, output_ln)
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aggregator.add_scores(scores)
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result = aggregator.aggregate()
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return {k: round(v.mid.fmeasure * 100, 4) for k, v in result.items()}
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# Utilities for freezing parameters and checking whether they are frozen
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def freeze_params(model: nn.Module):
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"""Set requires_grad=False for each of model.parameters()"""
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for par in model.parameters():
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par.requires_grad = False
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def grad_status(model: nn.Module) -> Iterable:
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return (par.requires_grad for par in model.parameters())
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def any_requires_grad(model: nn.Module) -> bool:
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return any(grad_status(model))
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def assert_all_frozen(model):
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model_grads: List[bool] = list(grad_status(model))
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n_require_grad = sum(lmap(int, model_grads))
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npars = len(model_grads)
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assert not any(model_grads), f"{n_require_grad/npars:.1%} of {npars} weights require grad"
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def assert_not_all_frozen(model):
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model_grads: List[bool] = list(grad_status(model))
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npars = len(model_grads)
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assert any(model_grads), f"none of {npars} weights require grad"
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# CLI Parsing utils
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def parse_numeric_n_bool_cl_kwargs(unparsed_args: List[str]) -> Dict[str, Union[int, float, bool]]:
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"""
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Parse an argv list of unspecified command line args to a dict.
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Assumes all values are either numeric or boolean in the form of true/false.
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"""
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result = {}
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assert len(unparsed_args) % 2 == 0, f"got odd number of unparsed args: {unparsed_args}"
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num_pairs = len(unparsed_args) // 2
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for pair_num in range(num_pairs):
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i = 2 * pair_num
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assert unparsed_args[i].startswith("--")
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if unparsed_args[i + 1].lower() == "true":
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value = True
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elif unparsed_args[i + 1].lower() == "false":
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value = False
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else:
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try:
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value = int(unparsed_args[i + 1])
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except ValueError:
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value = float(unparsed_args[i + 1]) # this can raise another informative ValueError
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result[unparsed_args[i][2:]] = value
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return result
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def write_txt_file(ordered_tgt, path):
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f = Path(path).open("w")
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for ln in ordered_tgt:
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f.write(ln + "\n")
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f.flush()
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