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4.41 kB
| # -*- coding: utf-8 -*- | |
| # Copyright (c) Alibaba, Inc. and its affiliates. | |
| # mypy: disable-error-code="annotation-unchecked" | |
| import base64 | |
| import unicodedata | |
| from typing import Collection, Dict, List, Set, Union | |
| from .tokenizer_base import Tokenizer | |
| PAT_STR = r"""(?i:'s|'t|'re|'ve|'m|'ll|'d)|[^\r\n\p{L}\p{N}]?\p{L}+|\p{N}| ?[^\s\p{L}\p{N}]+[\r\n]*|\s*[\r\n]+|\s+(?!\S)|\s+""" # noqa E501 # pylint: disable=line-too-long | |
| ENDOFTEXT = "<|endoftext|>" | |
| IMSTART = "<|im_start|>" | |
| IMEND = "<|im_end|>" | |
| # as the default behavior is changed to allow special tokens in | |
| # regular texts, the surface forms of special tokens need to be | |
| # as different as possible to minimize the impact | |
| EXTRAS = tuple((f"<|extra_{i}|>" for i in range(205))) | |
| # changed to use actual index to avoid misconfiguration with vocabulary expansion # noqa: E501 | |
| SPECIAL_START_ID = 151643 | |
| SPECIAL_TOKENS = tuple( | |
| enumerate( | |
| ( | |
| ( | |
| ENDOFTEXT, | |
| IMSTART, | |
| IMEND, | |
| ) | |
| + EXTRAS | |
| ), | |
| start=SPECIAL_START_ID, | |
| ), | |
| ) | |
| SPECIAL_TOKENS_SET = set(t for i, t in SPECIAL_TOKENS) | |
| class QwenTokenizer(Tokenizer): | |
| def _load_tiktoken_bpe(tiktoken_bpe_file: str) -> Dict[bytes, int]: | |
| with open(tiktoken_bpe_file, "rb") as f: | |
| contents = f.read() | |
| return { | |
| base64.b64decode(token): int(rank) | |
| for token, rank in ( | |
| line.split() for line in contents.splitlines() if line | |
| ) | |
| } | |
| def __init__(self, vocab_file, errors="replace", extra_vocab_file=None): | |
| self._errors = errors | |
| self._vocab_file = vocab_file | |
| self._extra_vocab_file = extra_vocab_file | |
| self._mergeable_ranks = QwenTokenizer._load_tiktoken_bpe( | |
| vocab_file, | |
| ) # type: Dict[bytes, int] | |
| self._special_tokens = { | |
| token: index for index, token in SPECIAL_TOKENS | |
| } | |
| # try load extra vocab from file | |
| if extra_vocab_file is not None: | |
| used_ids = set(self._mergeable_ranks.values()) | set( | |
| self._special_tokens.values(), | |
| ) | |
| extra_mergeable_ranks = self._load_tiktoken_bpe(extra_vocab_file) | |
| for token, index in extra_mergeable_ranks.items(): | |
| if token in self._mergeable_ranks: | |
| continue | |
| if index in used_ids: | |
| continue | |
| self._mergeable_ranks[token] = index | |
| # the index may be sparse after this, but don't worry tiktoken.Encoding will handle this # noqa: E501 # pylint: disable=line-too-long | |
| import tiktoken | |
| enc = tiktoken.Encoding( | |
| "Qwen", | |
| pat_str=PAT_STR, | |
| mergeable_ranks=self._mergeable_ranks, | |
| special_tokens=self._special_tokens, | |
| ) | |
| assert ( | |
| len(self._mergeable_ranks) + len(self._special_tokens) | |
| == enc.n_vocab | |
| ), f"{len(self._mergeable_ranks) + len(self._special_tokens)} != {enc.n_vocab} in encoding" # noqa: E501 # pylint: disable=line-too-long | |
| self.decoder = { | |
| v: k for k, v in self._mergeable_ranks.items() | |
| } # type: dict[int, bytes|str] | |
| self.decoder.update({v: k for k, v in self._special_tokens.items()}) | |
| self._tokenizer = enc # type: tiktoken.Encoding | |
| self.eod_id = self._tokenizer.eot_token | |
| self.im_start_id = self._special_tokens[IMSTART] | |
| self.im_end_id = self._special_tokens[IMEND] | |
| def encode( # type: ignore[override] | |
| self, | |
| text: str, | |
| allowed_special: Union[Set, str] = "all", | |
| disallowed_special: Union[Collection, str] = (), | |
| ) -> Union[List[List], List]: | |
| text = unicodedata.normalize("NFC", text) | |
| return self._tokenizer.encode( | |
| text, | |
| allowed_special=allowed_special, | |
| disallowed_special=disallowed_special, | |
| ) | |
| def decode( | |
| self, | |
| token_ids: Union[int, List[int]], | |
| skip_special_tokens: bool = False, | |
| errors: str = None, | |
| **kwargs, | |
| ) -> str: | |
| if isinstance(token_ids, int): | |
| token_ids = [token_ids] | |
| if skip_special_tokens: | |
| token_ids = [i for i in token_ids if i < self.eod_id] | |
| return self._tokenizer.decode(token_ids, errors=errors or self._errors) | |