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tokenization_kobert.py ADDED
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+ # coding=utf-8
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+ # Copyright 2018 Google AI, Google Brain and Carnegie Mellon University Authors and the HuggingFace Inc. team and Jangwon Park
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+ #
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+ # Licensed under the Apache License, Version 2.0 (the "License");
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+ # you may not use this file except in compliance with the License.
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+ # You may obtain a copy of the License at
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+ #
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+ # http://www.apache.org/licenses/LICENSE-2.0
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+ #
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+ # Unless required by applicable law or agreed to in writing, software
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+ # distributed under the License is distributed on an "AS IS" BASIS,
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+ # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ # See the License for the specific language governing permissions and
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+ # limitations under the License.
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+ """ Tokenization classes for KoBERT model """
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+
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+
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+ import logging
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+ import os
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+ import unicodedata
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+ from shutil import copyfile
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+
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+ from transformers import PreTrainedTokenizer
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+
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+ logger = logging.getLogger(__name__)
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+
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+ VOCAB_FILES_NAMES = {
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+ "vocab_file": "tokenizer_78b3253a26.model",
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+ "vocab_txt": "vocab.txt",
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+ }
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+
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+ PRETRAINED_VOCAB_FILES_MAP = {
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+ "vocab_file": {
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+ "monologg/kobert": "https://s3.amazonaws.com/models.huggingface.co/bert/monologg/kobert/tokenizer_78b3253a26.model",
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+ "monologg/kobert-lm": "https://s3.amazonaws.com/models.huggingface.co/bert/monologg/kobert-lm/tokenizer_78b3253a26.model",
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+ "monologg/distilkobert": "https://s3.amazonaws.com/models.huggingface.co/bert/monologg/distilkobert/tokenizer_78b3253a26.model",
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+ },
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+ "vocab_txt": {
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+ "monologg/kobert": "https://s3.amazonaws.com/models.huggingface.co/bert/monologg/kobert/vocab.txt",
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+ "monologg/kobert-lm": "https://s3.amazonaws.com/models.huggingface.co/bert/monologg/kobert-lm/vocab.txt",
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+ "monologg/distilkobert": "https://s3.amazonaws.com/models.huggingface.co/bert/monologg/distilkobert/vocab.txt",
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+ },
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+ }
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+
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+ PRETRAINED_POSITIONAL_EMBEDDINGS_SIZES = {
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+ "monologg/kobert": 512,
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+ "monologg/kobert-lm": 512,
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+ "monologg/distilkobert": 512,
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+ }
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+
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+ PRETRAINED_INIT_CONFIGURATION = {
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+ "monologg/kobert": {"do_lower_case": False},
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+ "monologg/kobert-lm": {"do_lower_case": False},
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+ "monologg/distilkobert": {"do_lower_case": False},
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+ }
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+
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+ SPIECE_UNDERLINE = "▁"
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+
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+
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+ class KoBertTokenizer(PreTrainedTokenizer):
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+ """
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+ SentencePiece based tokenizer. Peculiarities:
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+ - requires `SentencePiece <https://github.com/google/sentencepiece>`_
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+ """
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+
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+ vocab_files_names = VOCAB_FILES_NAMES
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+ pretrained_vocab_files_map = PRETRAINED_VOCAB_FILES_MAP
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+ pretrained_init_configuration = PRETRAINED_INIT_CONFIGURATION
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+ max_model_input_sizes = PRETRAINED_POSITIONAL_EMBEDDINGS_SIZES
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+
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+ def __init__(
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+ self,
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+ vocab_file,
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+ vocab_txt,
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+ do_lower_case=False,
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+ remove_space=True,
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+ keep_accents=False,
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+ unk_token="[UNK]",
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+ sep_token="[SEP]",
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+ pad_token="[PAD]",
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+ cls_token="[CLS]",
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+ mask_token="[MASK]",
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+ **kwargs,
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+ ):
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+ super().__init__(
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+ unk_token=unk_token,
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+ sep_token=sep_token,
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+ pad_token=pad_token,
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+ cls_token=cls_token,
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+ mask_token=mask_token,
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+ **kwargs,
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+ )
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+
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+ # Build vocab
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+ self.token2idx = dict()
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+ self.idx2token = []
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+ with open(vocab_txt, "r", encoding="utf-8") as f:
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+ for idx, token in enumerate(f):
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+ token = token.strip()
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+ self.token2idx[token] = idx
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+ self.idx2token.append(token)
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+
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+ try:
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+ import sentencepiece as spm
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+ except ImportError:
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+ logger.warning(
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+ "You need to install SentencePiece to use KoBertTokenizer: https://github.com/google/sentencepiece"
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+ "pip install sentencepiece"
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+ )
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+
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+ self.do_lower_case = do_lower_case
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+ self.remove_space = remove_space
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+ self.keep_accents = keep_accents
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+ self.vocab_file = vocab_file
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+ self.vocab_txt = vocab_txt
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+
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+ self.sp_model = spm.SentencePieceProcessor()
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+ self.sp_model.Load(vocab_file)
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+
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+ @property
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+ def vocab_size(self):
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+ return len(self.idx2token)
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+
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+ def get_vocab(self):
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+ return dict(self.token2idx, **self.added_tokens_encoder)
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+
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+ def __getstate__(self):
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+ state = self.__dict__.copy()
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+ state["sp_model"] = None
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+ return state
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+
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+ def __setstate__(self, d):
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+ self.__dict__ = d
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+ try:
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+ import sentencepiece as spm
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+ except ImportError:
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+ logger.warning(
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+ "You need to install SentencePiece to use KoBertTokenizer: https://github.com/google/sentencepiece"
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+ "pip install sentencepiece"
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+ )
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+ self.sp_model = spm.SentencePieceProcessor()
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+ self.sp_model.Load(self.vocab_file)
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+
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+ def preprocess_text(self, inputs):
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+ if self.remove_space:
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+ outputs = " ".join(inputs.strip().split())
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+ else:
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+ outputs = inputs
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+ outputs = outputs.replace("``", '"').replace("''", '"')
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+
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+ if not self.keep_accents:
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+ outputs = unicodedata.normalize("NFKD", outputs)
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+ outputs = "".join([c for c in outputs if not unicodedata.combining(c)])
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+ if self.do_lower_case:
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+ outputs = outputs.lower()
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+
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+ return outputs
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+
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+ def _tokenize(self, text):
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+ """Tokenize a string."""
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+ text = self.preprocess_text(text)
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+ pieces = self.sp_model.encode(text, out_type=str)
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+ new_pieces = []
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+ for piece in pieces:
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+ if len(piece) > 1 and piece[-1] == str(",") and piece[-2].isdigit():
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+ cur_pieces = self.sp_model.EncodeAsPieces(piece[:-1].replace(SPIECE_UNDERLINE, ""))
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+ if piece[0] != SPIECE_UNDERLINE and cur_pieces[0][0] == SPIECE_UNDERLINE:
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+ if len(cur_pieces[0]) == 1:
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+ cur_pieces = cur_pieces[1:]
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+ else:
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+ cur_pieces[0] = cur_pieces[0][1:]
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+ cur_pieces.append(piece[-1])
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+ new_pieces.extend(cur_pieces)
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+ else:
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+ new_pieces.append(piece)
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+
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+ return new_pieces
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+
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+ def _convert_token_to_id(self, token):
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+ """ Converts a token (str/unicode) in an id using the vocab. """
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+ return self.token2idx.get(token, self.token2idx[self.unk_token])
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+
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+ def _convert_id_to_token(self, index):
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+ """Converts an index (integer) in a token (string/unicode) using the vocab."""
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+ return self.idx2token[index]
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+
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+ def convert_tokens_to_string(self, tokens):
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+ """Converts a sequence of tokens (strings for sub-words) in a single string."""
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+ out_string = "".join(tokens).replace(SPIECE_UNDERLINE, " ").strip()
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+ return out_string
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+
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+ def build_inputs_with_special_tokens(self, token_ids_0, token_ids_1=None):
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+ """
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+ Build model inputs from a sequence or a pair of sequence for sequence classification tasks
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+ by concatenating and adding special tokens.
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+ A KoBERT sequence has the following format:
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+ single sequence: [CLS] X [SEP]
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+ pair of sequences: [CLS] A [SEP] B [SEP]
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+ """
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+ if token_ids_1 is None:
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+ return [self.cls_token_id] + token_ids_0 + [self.sep_token_id]
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+ cls = [self.cls_token_id]
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+ sep = [self.sep_token_id]
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+ return cls + token_ids_0 + sep + token_ids_1 + sep
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+
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+ def get_special_tokens_mask(self, token_ids_0, token_ids_1=None, already_has_special_tokens=False):
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+ """
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+ Retrieves sequence ids from a token list that has no special tokens added. This method is called when adding
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+ special tokens using the tokenizer ``prepare_for_model`` or ``encode_plus`` methods.
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+ Args:
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+ token_ids_0: list of ids (must not contain special tokens)
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+ token_ids_1: Optional list of ids (must not contain special tokens), necessary when fetching sequence ids
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+ for sequence pairs
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+ already_has_special_tokens: (default False) Set to True if the token list is already formated with
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+ special tokens for the model
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+ Returns:
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+ A list of integers in the range [0, 1]: 0 for a special token, 1 for a sequence token.
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+ """
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+
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+ if already_has_special_tokens:
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+ if token_ids_1 is not None:
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+ raise ValueError(
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+ "You should not supply a second sequence if the provided sequence of "
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+ "ids is already formated with special tokens for the model."
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+ )
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+ return list(
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+ map(
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+ lambda x: 1 if x in [self.sep_token_id, self.cls_token_id] else 0,
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+ token_ids_0,
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+ )
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+ )
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+
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+ if token_ids_1 is not None:
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+ return [1] + ([0] * len(token_ids_0)) + [1] + ([0] * len(token_ids_1)) + [1]
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+ return [1] + ([0] * len(token_ids_0)) + [1]
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+
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+ def create_token_type_ids_from_sequences(self, token_ids_0, token_ids_1=None):
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+ """
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+ Creates a mask from the two sequences passed to be used in a sequence-pair classification task.
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+ A KoBERT sequence pair mask has the following format:
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+ 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1
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+ | first sequence | second sequence
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+ if token_ids_1 is None, only returns the first portion of the mask (0's).
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+ """
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+ sep = [self.sep_token_id]
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+ cls = [self.cls_token_id]
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+ if token_ids_1 is None:
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+ return len(cls + token_ids_0 + sep) * [0]
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+ return len(cls + token_ids_0 + sep) * [0] + len(token_ids_1 + sep) * [1]
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+
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+ def save_vocabulary(self, save_directory):
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+ """Save the sentencepiece vocabulary (copy original file) and special tokens file
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+ to a directory.
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+ """
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+ if not os.path.isdir(save_directory):
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+ logger.error("Vocabulary path ({}) should be a directory".format(save_directory))
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+ return
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+
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+ # 1. Save sentencepiece model
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+ out_vocab_model = os.path.join(save_directory, VOCAB_FILES_NAMES["vocab_file"])
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+
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+ if os.path.abspath(self.vocab_file) != os.path.abspath(out_vocab_model):
263
+ copyfile(self.vocab_file, out_vocab_model)
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+
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+ # 2. Save vocab.txt
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+ index = 0
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+ out_vocab_txt = os.path.join(save_directory, VOCAB_FILES_NAMES["vocab_txt"])
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+ with open(out_vocab_txt, "w", encoding="utf-8") as writer:
269
+ for token, token_index in sorted(self.token2idx.items(), key=lambda kv: kv[1]):
270
+ if index != token_index:
271
+ logger.warning(
272
+ "Saving vocabulary to {}: vocabulary indices are not consecutive."
273
+ " Please check that the vocabulary is not corrupted!".format(out_vocab_txt)
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+ )
275
+ index = token_index
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+ writer.write(token + "\n")
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+ index += 1
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+
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+ return out_vocab_model, out_vocab_txt