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import json
import os
import shutil
import time
from pathlib import Path
from typing import List, Union, Optional
import tokenizers
import torch
from torch import NoneType
from huggingface_hub import hf_hub_download
from huggingface_hub.file_download import http_user_agent
from pypinyin import pinyin, Style
from transformers.tokenization_utils_base import TruncationStrategy
from transformers.utils import PaddingStrategy
from transformers.utils.generic import TensorType
try:
from tokenizers import BertWordPieceTokenizer
except:
from tokenizers.implementations import BertWordPieceTokenizer
from transformers import BertTokenizerFast, BatchEncoding
cache_path = Path(os.path.abspath(__file__)).parent
def download_file(filename: str, path: Path):
if os.path.exists(cache_path / filename):
return
if os.path.exists(path / filename):
shutil.copyfile(path / filename, cache_path / filename)
return
hf_hub_download(
"iioSnail/ChineseBERT-for-csc",
filename,
local_dir=cache_path,
user_agent=http_user_agent(),
)
time.sleep(0.2)
class ChineseBertTokenizer(BertTokenizerFast):
def __init__(self, **kwargs):
super(ChineseBertTokenizer, self).__init__(**kwargs)
self.path = Path(kwargs['name_or_path'])
vocab_file = cache_path / 'vocab.txt'
config_path = cache_path / 'config'
if not os.path.exists(config_path):
os.makedirs(config_path)
self.max_length = 512
download_file('vocab.txt', self.path)
self.tokenizer = BertWordPieceTokenizer(str(vocab_file))
# load pinyin map dict
download_file('config/pinyin_map.json', self.path)
with open(config_path / 'pinyin_map.json', encoding='utf8') as fin:
self.pinyin_dict = json.load(fin)
# load char id map tensor
download_file('config/id2pinyin.json', self.path)
with open(config_path / 'id2pinyin.json', encoding='utf8') as fin:
self.id2pinyin = json.load(fin)
# load pinyin map tensor
download_file('config/pinyin2tensor.json', self.path)
with open(config_path / 'pinyin2tensor.json', encoding='utf8') as fin:
self.pinyin2tensor = json.load(fin)
def __call__(self,
text: Union[str, List[str], List[List[str]]] = None,
text_pair: Union[str, List[str], List[List[str]], NoneType] = None,
text_target: Union[str, List[str], List[List[str]]] = None,
text_pair_target: Union[str, List[str], List[List[str]], NoneType] = None,
add_special_tokens: bool = True,
padding: Union[bool, str, PaddingStrategy] = False,
truncation: Union[bool, str, TruncationStrategy] = None,
max_length: Optional[int] = None,
stride: int = 0,
is_split_into_words: bool = False,
pad_to_multiple_of: Optional[int] = None,
return_tensors: Union[str, TensorType, NoneType] = None,
return_token_type_ids: Optional[bool] = None,
return_attention_mask: Optional[bool] = None,
return_overflowing_tokens: bool = False, return_special_tokens_mask: bool = False,
return_offsets_mapping: bool = False,
return_length: bool = False,
verbose: bool = True, **kwargs) -> BatchEncoding:
encoding = super(ChineseBertTokenizer, self).__call__(
text=text,
text_pair=text_pair,
text_target=text_target,
text_pair_target=text_pair_target,
add_special_tokens=add_special_tokens,
padding=padding,
truncation=truncation,
max_length=max_length,
stride=stride,
is_split_into_words=is_split_into_words,
pad_to_multiple_of=pad_to_multiple_of,
return_tensors=return_tensors,
return_token_type_ids=return_token_type_ids,
return_attention_mask=return_attention_mask,
return_overflowing_tokens=return_overflowing_tokens,
return_offsets_mapping=True,
return_length=return_length,
verbose=verbose,
)
input_ids = encoding.input_ids
pinyin_ids = None
if type(text) == str:
offsets = encoding.offset_mapping[0].tolist()
tokens = self.sentence_to_tokens(text, offsets)
pinyin_ids = [self.convert_sentence_to_pinyin_ids(text, tokens, offsets)]
if type(text) == list or type(text) == tuple:
pinyin_ids = []
for i, sentence in enumerate(text):
offsets = encoding.offset_mapping[i].tolist()
tokens = self.sentence_to_tokens(sentence, offsets)
pinyin_ids.append(self.convert_sentence_to_pinyin_ids(sentence, tokens, offsets))
if torch.is_tensor(encoding.input_ids):
pinyin_ids = torch.LongTensor(pinyin_ids)
encoding['pinyin_ids'] = pinyin_ids
if not return_offsets_mapping:
del encoding['offset_mapping']
return encoding
def sentence_to_tokens(self, sentence, offsets):
tokens = []
for start, end in offsets:
tokens.append(sentence[start:end])
return tokens
def convert_sentence_to_pinyin_ids(self, sentence: str, tokens, offsets):
# get pinyin of a sentence
pinyin_list = pinyin(sentence, style=Style.TONE3, heteronym=True, errors=lambda x: [['not chinese'] for _ in x])
pinyin_locs = {}
# get pinyin of each location
for index, item in enumerate(pinyin_list):
pinyin_string = item[0]
# not a Chinese character, pass
if pinyin_string == "not chinese":
continue
if pinyin_string in self.pinyin2tensor:
pinyin_locs[index] = self.pinyin2tensor[pinyin_string]
else:
ids = [0] * 8
for i, p in enumerate(pinyin_string):
if p not in self.pinyin_dict["char2idx"]:
ids = [0] * 8
break
ids[i] = self.pinyin_dict["char2idx"][p]
pinyin_locs[index] = ids
# find chinese character location, and generate pinyin ids
pinyin_ids = []
for idx, (token, offset) in enumerate(zip(tokens, offsets)):
if offset[1] - offset[0] != 1:
pinyin_ids.append([0] * 8)
continue
if offset[0] in pinyin_locs:
pinyin_ids.append(pinyin_locs[offset[0]])
else:
pinyin_ids.append([0] * 8)
return pinyin_ids
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