| import os | |
| from typing import Union, List, Optional, Tuple | |
| from transformers import PreTrainedTokenizer, PreTrainedTokenizerFast, AutoTokenizer | |
| from transformers.utils.hub import cached_file | |
| class SentencePieceJA(PreTrainedTokenizer): | |
| def __init__(self, | |
| model_path = "./tokenizer.json", | |
| pad = "<PAD>", | |
| bos = "<BOS>", | |
| eos = "<EOS>", | |
| unk = "<UNK>", | |
| mask = "<MASK>", | |
| **kwargs): | |
| from tokenizers import Tokenizer | |
| try: | |
| self._tokenizer = Tokenizer.from_file(model_path) | |
| except Exception as e: | |
| print('exception: ', e) | |
| print('load from cache...') | |
| model_path = cached_file('if001/sentencepiece_ja', 'tokenizer.json') | |
| self._tokenizer = Tokenizer.from_file(model_path) | |
| super().__init__(**kwargs) | |
| self.add_special_tokens({ | |
| 'pad_token': pad, | |
| 'bos_token': bos, | |
| 'eos_token': eos, | |
| 'unk_token': unk, | |
| 'mask_token': mask | |
| }) | |
| def get_vocab(self) -> int: | |
| return self._tokenizer.get_vocab() | |
| def vocab_size(self) -> int: | |
| return self._tokenizer.get_vocab_size() | |
| def _tokenize(self, text, **kwargs): | |
| return self._tokenizer.encode(text).tokens | |
| def _convert_token_to_id(self, token): | |
| return self._tokenizer.encode(token).ids[0] | |
| def _convert_id_to_token(self, index: int) -> str: | |
| return self._tokenizer.decode(index) | |
| def save_vocabulary(self, save_directory: str, filename_prefix: Optional[str] = None) -> Tuple[str]: | |
| index = 0 | |
| if os.path.isdir(save_directory): | |
| vocab_file = os.path.join( | |
| save_directory, (filename_prefix + "-" if filename_prefix else "") + 'vocab.txt' | |
| ) | |
| else: | |
| vocab_file = (filename_prefix + "-" if filename_prefix else "") + save_directory | |
| with open(vocab_file, "w", encoding="utf-8") as writer: | |
| for token, token_index in sorted(self.get_vocab().items(), key=lambda kv: kv[1]): | |
| if index != token_index: | |
| index = token_index | |
| writer.write(token + "\n") | |
| index += 1 | |
| return (vocab_file,) |