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tokenizer.py

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+# coding=utf-8
+# Copyright 2018 The Google AI Language Team Authors, The HuggingFace Inc. team,
+# and Marco Polignano.
+#
+# 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 Italian AlBERTo models."""
+import collections
+import logging
+import os
+import re
+import logger
+
+try:
+    from ekphrasis.classes.preprocessor import TextPreProcessor
+    from ekphrasis.classes.tokenizer import SocialTokenizer
+    from ekphrasis.dicts.emoticons import emoticons
+except ImportError:
+    logger.warning(
+        "You need to install ekphrasis to use AlBERToTokenizer"
+        "pip install ekphrasis"
+    )
+    from pip._internal import main as pip
+    pip(['install', '--user', 'ekphrasis'])
+    from ekphrasis.classes.preprocessor import TextPreProcessor
+    from ekphrasis.classes.tokenizer import SocialTokenizer
+    from ekphrasis.dicts.emoticons import emoticons
+
+try:
+    import numpy as np
+except ImportError:
+    logger.warning(
+        "You need to install numpy to use AlBERToTokenizer"
+        "pip install numpy"
+    )
+    from pip._internal import main as pip
+    pip(['install', '--user', 'pandas'])
+    import pandas as pd
+
+try:
+    from transformers import BertTokenizer, WordpieceTokenizer
+    from transformers.tokenization_bert import load_vocab
+except ImportError:
+    logger.warning(
+        "You need to install pytorch-transformers to use AlBERToTokenizer"
+        "pip install pytorch-transformers"
+    )
+    from pip._internal import main as pip
+    pip(['install', '--user', 'pytorch-transformers'])
+    from transformers import BertTokenizer, WordpieceTokenizer
+    from transformers.tokenization_bert import load_vocab
+
+text_processor = TextPreProcessor(
+    # terms that will be normalized
+    normalize=['url', 'email', 'user', 'percent', 'money', 'phone', 'time', 'date', 'number'],
+    # terms that will be annotated
+    annotate={"hashtag"},
+    fix_html=True,  # fix HTML tokens
+
+    unpack_hashtags=True,  # perform word segmentation on hashtags
+
+    # select a tokenizer. You can use SocialTokenizer, or pass your own
+    # the tokenizer, should take as input a string and return a list of tokens
+    tokenizer=SocialTokenizer(lowercase=True).tokenize,
+    dicts=[emoticons]
+)
+
+class AlBERTo_Preprocessing(object):
+    def __init__(self, do_lower_case=True, **kwargs):
+        self.do_lower_case = do_lower_case
+
+    def preprocess(self, text):
+        if self.do_lower_case:
+            text = text.lower()
+        text = str(" ".join(text_processor.pre_process_doc(text)))
+        text = re.sub(r'[^a-zA-ZÀ-ú</>!?♥♡\s\U00010000-\U0010ffff]', ' ', text)
+        text = re.sub(r'\s+', ' ', text)
+        text = re.sub(r'(\w)\1{2,}', r'\1\1', text)
+        text = re.sub(r'^\s', '', text)
+        text = re.sub(r'\s$', '', text)
+        return text
+
+class AlBERToTokenizer(BertTokenizer):
+
+    def __init__(self, vocab_file, do_lower_case=True,
+                 do_basic_tokenize=True, do_char_tokenize=False, do_wordpiece_tokenize=False, do_preprocessing = True, unk_token='[UNK]',
+                 sep_token='[SEP]',
+                 pad_token='[PAD]', cls_token='[CLS]', mask_token='[MASK]', **kwargs):
+        super(BertTokenizer, self).__init__(
+            unk_token=unk_token, sep_token=sep_token, pad_token=pad_token,
+            cls_token=cls_token, mask_token=mask_token, **kwargs)
+
+        self.do_wordpiece_tokenize = do_wordpiece_tokenize
+        self.do_lower_case = do_lower_case
+        self.vocab_file = vocab_file
+        self.do_basic_tokenize = do_basic_tokenize
+        self.do_char_tokenize = do_char_tokenize
+        self.unk_token = unk_token
+        self.do_preprocessing = do_preprocessing
+
+        if not os.path.isfile(vocab_file):
+            raise ValueError(
+                "Can't find a vocabulary file at path '{}'.".format(vocab_file))
+
+        self.vocab = load_vocab(vocab_file)
+        self.ids_to_tokens = collections.OrderedDict(
+            [(ids, tok) for tok, ids in self.vocab.items()])
+
+        if do_wordpiece_tokenize:
+            self.wordpiece_tokenizer = WordpieceTokenizer(vocab=self.vocab,
+                                                          unk_token=self.unk_token)
+            
+        self.base_bert_tok = BertTokenizer(vocab_file=self.vocab_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, **kwargs)
+
+    def _convert_token_to_id(self, token):
+        """Converts a token (str/unicode) to an id using the vocab."""
+        # if token[:2] == '##':
+        #     token = token[2:]
+
+        return self.vocab.get(token, self.vocab.get(self.unk_token))
+
+    def convert_token_to_id(self, token):
+        return self._convert_token_to_id(token)
+
+        return self.vocab.get(token, self.vocab.get(self.unk_token))
+
+    def _convert_id_to_token(self, id):
+        # if token[:2] == '##':
+        #     token = token[2:]
+
+        return list(self.vocab.keys())[int(id)]
+    def convert_id_to_token(self, id):
+        return self._convert_id_to_token(id)
+
+    def _convert_tokens_to_string(self,tokens):
+        """Converts a sequence of tokens (string) to a single string."""
+        out_string = ' '.join(tokens).replace('##', '').strip()
+        return out_string
+
+    def convert_tokens_to_string(self,tokens):
+        return self._convert_tokens_to_string(tokens)
+
+    def _tokenize(self, text, never_split=None, **kwargs):
+        if self.do_preprocessing:
+            if self.do_lower_case:
+                text = text.lower()
+            text = str(" ".join(text_processor.pre_process_doc(text)))
+            text = re.sub(r'[^a-zA-ZÀ-ú</>!?♥♡\s\U00010000-\U0010ffff]', ' ', text)
+            text = re.sub(r'\s+', ' ', text)
+            text = re.sub(r'(\w)\1{2,}', r'\1\1', text)
+            text = re.sub(r'^\s', '', text)
+            text = re.sub(r'\s$', '', text)
+            # print(s)
+
+        split_tokens = [text]
+        if self.do_wordpiece_tokenize:
+            wordpiece_tokenizer = WordpieceTokenizer(self.vocab,self.unk_token)
+            split_tokens = wordpiece_tokenizer.tokenize(text)
+
+        elif self.do_char_tokenize:
+            tokenizer = CharacterTokenizer(self.vocab, self.unk_token)
+            split_tokens = tokenizer.tokenize(text)
+
+        elif self.do_basic_tokenize:
+            """Tokenizes a piece of text."""
+            split_tokens = self.base_bert_tok.tokenize(text)
+
+        return split_tokens
+
+    def tokenize(self, text, never_split=None, **kwargs):
+        return self._tokenize(text, never_split)
+
+
+class CharacterTokenizer(object):
+    """Runs Character tokenziation."""
+
+    def __init__(self, vocab, unk_token,
+                 max_input_chars_per_word=100, with_markers=True):
+        """Constructs a CharacterTokenizer.
+        Args:
+            vocab: Vocabulary object.
+            unk_token: A special symbol for out-of-vocabulary token.
+            with_markers: If True, "#" is appended to each output character except the
+                first one.
+        """
+        self.vocab = vocab
+        self.unk_token = unk_token
+        self.max_input_chars_per_word = max_input_chars_per_word
+        self.with_markers = with_markers
+
+    def tokenize(self, text):
+        """Tokenizes a piece of text into characters.
+
+        For example:
+            input = "apple"
+            output = ["a", "##p", "##p", "##l", "##e"]  (if self.with_markers is True)
+            output = ["a", "p", "p", "l", "e"]          (if self.with_markers is False)
+        Args:
+            text: A single token or whitespace separated tokens.
+                This should have already been passed through `BasicTokenizer`.
+        Returns:
+            A list of characters.
+        """
+
+        output_tokens = []
+        for i, char in enumerate(text):
+            if char not in self.vocab:
+                output_tokens.append(self.unk_token)
+                continue
+
+            if self.with_markers and i != 0:
+                output_tokens.append('##' + char)
+            else:
+                output_tokens.append(char)
+
+        return output_tokens
+
+if __name__== "__main__":
+    a = AlBERTo_Preprocessing(do_lower_case=True)
+    s = "#IlGOverno presenta le linee guida sulla scuola #labuonascuola - http://t.co/SYS1T9QmQN"
+    b = a.preprocess(s)
+    print(b)
+
+    c =AlBERToTokenizer(do_lower_case=True,vocab_file="vocab.txt", do_preprocessing=True)
+    d = c.tokenize(s)
+    print(d)