| import json |
| import os |
| from transformers import PreTrainedTokenizer |
|
|
| class ChessTokenizer(PreTrainedTokenizer): |
| model_input_names = ["input_ids", "attention_mask"] |
| vocab_files_names = {"vocab_file": "vocab.json"} |
| PAD_TOKEN = "[PAD]" |
| BOS_TOKEN = "[BOS]" |
| EOS_TOKEN = "[EOS]" |
| UNK_TOKEN = "[UNK]" |
| def __init__(self, vocab_file=None, vocab=None, **kwargs): |
| self._pad_token = self.PAD_TOKEN |
| self._bos_token = self.BOS_TOKEN |
| self._eos_token = self.EOS_TOKEN |
| self._unk_token = self.UNK_TOKEN |
| kwargs.pop("pad_token", None) |
| kwargs.pop("bos_token", None) |
| kwargs.pop("eos_token", None) |
| kwargs.pop("unk_token", None) |
| if vocab is not None: |
| self._vocab = vocab |
| elif vocab_file is not None and os.path.exists(vocab_file): |
| with open(vocab_file, "r", encoding="utf-8") as f: |
| self._vocab = json.load(f) |
| else: |
| self._vocab = self._create_default_vocab() |
| self._ids_to_tokens = {v: k for k, v in self._vocab.items()} |
| super().__init__(pad_token=self._pad_token, bos_token=self._bos_token, eos_token=self._eos_token, unk_token=self._unk_token, **kwargs) |
| def _create_default_vocab(self): |
| special_tokens = [self.PAD_TOKEN, self.BOS_TOKEN, self.EOS_TOKEN, self.UNK_TOKEN] |
| return {token: idx for idx, token in enumerate(special_tokens)} |
| @property |
| def vocab_size(self): |
| return len(self._vocab) |
| def get_vocab(self): |
| return dict(self._vocab) |
| def _tokenize(self, text): |
| return text.strip().split() |
| def _convert_token_to_id(self, token): |
| return self._vocab.get(token, self._vocab.get(self.UNK_TOKEN, 0)) |
| def _convert_id_to_token(self, index): |
| return self._ids_to_tokens.get(index, self.UNK_TOKEN) |
| def convert_tokens_to_string(self, tokens): |
| special = {self.PAD_TOKEN, self.BOS_TOKEN, self.EOS_TOKEN, self.UNK_TOKEN} |
| return " ".join(t for t in tokens if t not in special) |
| def save_vocabulary(self, save_directory, filename_prefix=None): |
| if not os.path.isdir(save_directory): |
| os.makedirs(save_directory, exist_ok=True) |
| vocab_file = os.path.join(save_directory, (filename_prefix + "-" if filename_prefix else "") + "vocab.json") |
| with open(vocab_file, "w", encoding="utf-8") as f: |
| json.dump(self._vocab, f, ensure_ascii=False, indent=2) |
| return (vocab_file,) |
|
|
