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mindnlp/transformers/models/mobilebert/tokenization_mobilebert_fast.py
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# coding=utf-8 | ||
# | ||
# Copyright 2020 The HuggingFace Team. All rights reserved. | ||
# | ||
# Licensed under the Apache License, Version 2.0 (the "License"); | ||
# you may not use this file except in compliance with the License. | ||
# You may obtain a copy of the License at | ||
# | ||
# http://www.apache.org/licenses/LICENSE-2.0 | ||
# | ||
# Unless required by applicable law or agreed to in writing, software | ||
# distributed under the License is distributed on an "AS IS" BASIS, | ||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
# See the License for the specific language governing permissions and | ||
# limitations under the License. | ||
"""Tokenization classes for MobileBERT.""" | ||
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import json | ||
from typing import List, Optional, Tuple | ||
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from tokenizers import normalizers | ||
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from ...tokenization_utils_fast import PreTrainedTokenizerFast | ||
from .tokenization_mobilebert import MobileBertTokenizer | ||
from ....utils import logging | ||
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logger = logging.get_logger(__name__) | ||
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VOCAB_FILES_NAMES = {"vocab_file": "vocab.txt", "tokenizer_file": "tokenizer.json"} | ||
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# Copied from transformers.models.bert.tokenization_bert_fast.BertTokenizerFast with BERT->MobileBERT,Bert->MobileBert | ||
class MobileBertTokenizerFast(PreTrainedTokenizerFast): | ||
r""" | ||
Construct a "fast" MobileBERT tokenizer (backed by HuggingFace's *tokenizers* library). Based on WordPiece. | ||
This tokenizer inherits from [`PreTrainedTokenizerFast`] which contains most of the main methods. Users should | ||
refer to this superclass for more information regarding those methods. | ||
Args: | ||
vocab_file (`str`): | ||
File containing the vocabulary. | ||
do_lower_case (`bool`, *optional*, defaults to `True`): | ||
Whether or not to lowercase the input when tokenizing. | ||
unk_token (`str`, *optional*, defaults to `"[UNK]"`): | ||
The unknown token. A token that is not in the vocabulary cannot be converted to an ID and is set to be this | ||
token instead. | ||
sep_token (`str`, *optional*, defaults to `"[SEP]"`): | ||
The separator token, which is used when building a sequence from multiple sequences, e.g. two sequences for | ||
sequence classification or for a text and a question for question answering. It is also used as the last | ||
token of a sequence built with special tokens. | ||
pad_token (`str`, *optional*, defaults to `"[PAD]"`): | ||
The token used for padding, for example when batching sequences of different lengths. | ||
cls_token (`str`, *optional*, defaults to `"[CLS]"`): | ||
The classifier token which is used when doing sequence classification (classification of the whole sequence | ||
instead of per-token classification). It is the first token of the sequence when built with special tokens. | ||
mask_token (`str`, *optional*, defaults to `"[MASK]"`): | ||
The token used for masking values. This is the token used when training this model with masked language | ||
modeling. This is the token which the model will try to predict. | ||
clean_text (`bool`, *optional*, defaults to `True`): | ||
Whether or not to clean the text before tokenization by removing any control characters and replacing all | ||
whitespaces by the classic one. | ||
tokenize_chinese_chars (`bool`, *optional*, defaults to `True`): | ||
Whether or not to tokenize Chinese characters. This should likely be deactivated for Japanese (see [this | ||
issue](https://github.com/huggingface/transformers/issues/328)). | ||
strip_accents (`bool`, *optional*): | ||
Whether or not to strip all accents. If this option is not specified, then it will be determined by the | ||
value for `lowercase` (as in the original MobileBERT). | ||
wordpieces_prefix (`str`, *optional*, defaults to `"##"`): | ||
The prefix for subwords. | ||
""" | ||
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vocab_files_names = VOCAB_FILES_NAMES | ||
slow_tokenizer_class = MobileBertTokenizer | ||
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def __init__( | ||
self, | ||
vocab_file=None, | ||
tokenizer_file=None, | ||
do_lower_case=True, | ||
unk_token="[UNK]", | ||
sep_token="[SEP]", | ||
pad_token="[PAD]", | ||
cls_token="[CLS]", | ||
mask_token="[MASK]", | ||
tokenize_chinese_chars=True, | ||
strip_accents=None, | ||
**kwargs, | ||
): | ||
super().__init__( | ||
vocab_file, | ||
tokenizer_file=tokenizer_file, | ||
do_lower_case=do_lower_case, | ||
unk_token=unk_token, | ||
sep_token=sep_token, | ||
pad_token=pad_token, | ||
cls_token=cls_token, | ||
mask_token=mask_token, | ||
tokenize_chinese_chars=tokenize_chinese_chars, | ||
strip_accents=strip_accents, | ||
**kwargs, | ||
) | ||
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normalizer_state = json.loads(self.backend_tokenizer.normalizer.__getstate__()) | ||
if ( | ||
normalizer_state.get("lowercase", do_lower_case) != do_lower_case | ||
or normalizer_state.get("strip_accents", strip_accents) != strip_accents | ||
or normalizer_state.get("handle_chinese_chars", tokenize_chinese_chars) != tokenize_chinese_chars | ||
): | ||
normalizer_class = getattr(normalizers, normalizer_state.pop("type")) | ||
normalizer_state["lowercase"] = do_lower_case | ||
normalizer_state["strip_accents"] = strip_accents | ||
normalizer_state["handle_chinese_chars"] = tokenize_chinese_chars | ||
self.backend_tokenizer.normalizer = normalizer_class(**normalizer_state) | ||
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self.do_lower_case = do_lower_case | ||
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def build_inputs_with_special_tokens(self, token_ids_0, token_ids_1=None): | ||
""" | ||
Build model inputs from a sequence or a pair of sequence for sequence classification tasks by concatenating and | ||
adding special tokens. A MobileBERT sequence has the following format: | ||
- single sequence: `[CLS] X [SEP]` | ||
- pair of sequences: `[CLS] A [SEP] B [SEP]` | ||
Args: | ||
token_ids_0 (`List[int]`): | ||
List of IDs to which the special tokens will be added. | ||
token_ids_1 (`List[int]`, *optional*): | ||
Optional second list of IDs for sequence pairs. | ||
Returns: | ||
`List[int]`: List of [input IDs](../glossary#input-ids) with the appropriate special tokens. | ||
""" | ||
output = [self.cls_token_id] + token_ids_0 + [self.sep_token_id] | ||
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if token_ids_1 is not None: | ||
output += token_ids_1 + [self.sep_token_id] | ||
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return output | ||
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def create_token_type_ids_from_sequences( | ||
self, token_ids_0: List[int], token_ids_1: Optional[List[int]] = None | ||
) -> List[int]: | ||
""" | ||
Create a mask from the two sequences passed to be used in a sequence-pair classification task. A MobileBERT sequence | ||
pair mask has the following format: | ||
``` | ||
0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 | ||
| first sequence | second sequence | | ||
``` | ||
If `token_ids_1` is `None`, this method only returns the first portion of the mask (0s). | ||
Args: | ||
token_ids_0 (`List[int]`): | ||
List of IDs. | ||
token_ids_1 (`List[int]`, *optional*): | ||
Optional second list of IDs for sequence pairs. | ||
Returns: | ||
`List[int]`: List of [token type IDs](../glossary#token-type-ids) according to the given sequence(s). | ||
""" | ||
sep = [self.sep_token_id] | ||
cls = [self.cls_token_id] | ||
if token_ids_1 is None: | ||
return len(cls + token_ids_0 + sep) * [0] | ||
return len(cls + token_ids_0 + sep) * [0] + len(token_ids_1 + sep) * [1] | ||
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def save_vocabulary(self, save_directory: str, filename_prefix: Optional[str] = None) -> Tuple[str]: | ||
files = self._tokenizer.model.save(save_directory, name=filename_prefix) | ||
return tuple(files) | ||
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__all__ = ['MobileBertTokenizerFast'] |