Source code for mindspore.dataset.text.transforms

# Copyright 2020-2022 Huawei Technologies Co., Ltd
#
# 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
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# 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.
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"""
The module text.transforms is inherited from _c_dataengine
and is implemented based on ICU4C and cppjieba in C++.
It's a high performance module to process NLP text.
Users can use Vocab to build their own dictionary,
use appropriate tokenizers to split sentences into different tokens,
and use Lookup to find the index of tokens in Vocab.

.. Note::
    A constructor's arguments for every class in this module must be saved into the
    class attributes (self.xxx) to support save() and load().

Examples:
    >>> text_file_dataset_dir = ["/path/to/text_file_dataset_file"] # contains 1 or multiple text files
    >>> # Create a dataset for text sentences saved as line data in a file
    >>> text_file_dataset = ds.TextFileDataset(dataset_files=text_file_dataset_dir, shuffle=False)
    >>> # Tokenize sentences to unicode characters
    >>> tokenizer = text.UnicodeCharTokenizer()
    >>> # Load vocabulary from list
    >>> vocab = text.Vocab.from_list(word_list=['深', '圳', '欢', '迎', '您'])
    >>> # Use Lookup operator to map tokens to ids
    >>> lookup = text.Lookup(vocab=vocab)
    >>> text_file_dataset = text_file_dataset.map(operations=[tokenizer, lookup])
    >>> # if text line in dataset_file is:
    >>> # 深圳欢迎您
    >>> # then the output will be:
    >>> # {'text': array([0, 1, 2, 3, 4], dtype=int32)}
"""
import json
import os
import re
import platform
import numpy as np

import mindspore._c_dataengine as cde
from mindspore.common import dtype as mstype

from .utils import JiebaMode, NormalizeForm, to_str, SPieceTokenizerOutType, SPieceTokenizerLoadType, SentencePieceVocab
from .validators import check_lookup, check_jieba_add_dict, check_to_vectors, \
    check_jieba_add_word, check_jieba_init, check_with_offsets, check_unicode_script_tokenizer, \
    check_wordpiece_tokenizer, check_regex_replace, check_regex_tokenizer, check_basic_tokenizer, check_ngram, \
    check_pair_truncate, check_to_number, check_bert_tokenizer, check_python_tokenizer, check_slidingwindow, \
    check_sentence_piece_tokenizer
from ..core.datatypes import mstype_to_detype
from ..core.validator_helpers import replace_none
from ..transforms.py_transforms_util import Implementation
from ..transforms.transforms import TensorOperation
from ..transforms.validators import invalidate_callable


class TextTensorOperation(TensorOperation):
    """
    Base class of Text Tensor Ops
    """

    def __init__(self):
        super().__init__()
        self.implementation = Implementation.C

    def parse(self):
        raise NotImplementedError("TextTensorOperation has to implement parse() method.")


DE_C_INTER_JIEBA_MODE = {
    JiebaMode.MIX: cde.JiebaMode.DE_JIEBA_MIX,
    JiebaMode.MP: cde.JiebaMode.DE_JIEBA_MP,
    JiebaMode.HMM: cde.JiebaMode.DE_JIEBA_HMM
}

DE_C_INTER_SENTENCEPIECE_LOADTYPE = {
    SPieceTokenizerLoadType.FILE: cde.SPieceTokenizerLoadType.DE_SPIECE_TOKENIZER_LOAD_KFILE,
    SPieceTokenizerLoadType.MODEL: cde.SPieceTokenizerLoadType.DE_SPIECE_TOKENIZER_LOAD_KMODEL
}

DE_C_INTER_SENTENCEPIECE_OUTTYPE = {
    SPieceTokenizerOutType.STRING: cde.SPieceTokenizerOutType.DE_SPIECE_TOKENIZER_OUTTYPE_KString,
    SPieceTokenizerOutType.INT: cde.SPieceTokenizerOutType.DE_SPIECE_TOKENIZER_OUTTYPE_KINT
}


[文档]class JiebaTokenizer(TextTensorOperation): """ Tokenize Chinese string into words based on dictionary. Note: The integrity of the HMMSEgment algorithm and MPSegment algorithm files must be confirmed. Args: hmm_path (str): Dictionary file is used by HMMSegment algorithm. The dictionary can be obtained on the official website of cppjieba. mp_path (str): Dictionary file is used by MPSegment algorithm. The dictionary can be obtained on the official website of cppjieba. mode (JiebaMode, optional): Valid values can be any of [JiebaMode.MP, JiebaMode.HMM, JiebaMode.MIX](default=JiebaMode.MIX). - JiebaMode.MP, tokenize with MPSegment algorithm. - JiebaMode.HMM, tokenize with Hidden Markov Model Segment algorithm. - JiebaMode.MIX, tokenize with a mix of MPSegment and HMMSegment algorithm. with_offsets (bool, optional): Whether or not output offsets of tokens (default=False). Raises: ValueError: If path of HMMSegment dict is not provided. ValueError: If path of MPSegment dict is not provided. TypeError: If `hmm_path` or `mp_path` is not of type string. TypeError: If `with_offsets` is not of type bool. Supported Platforms: ``CPU`` Examples: >>> from mindspore.dataset.text import JiebaMode >>> # If with_offsets=False, default output one column {["text", dtype=str]} >>> jieba_hmm_file = "/path/to/jieba/hmm/file" >>> jieba_mp_file = "/path/to/jieba/mp/file" >>> tokenizer_op = text.JiebaTokenizer(jieba_hmm_file, jieba_mp_file, mode=JiebaMode.MP, with_offsets=False) >>> text_file_dataset = text_file_dataset.map(operations=tokenizer_op) >>> # If with_offsets=False, then output three columns {["token", dtype=str], ["offsets_start", dtype=uint32], >>> # ["offsets_limit", dtype=uint32]} >>> tokenizer_op = text.JiebaTokenizer(jieba_hmm_file, jieba_mp_file, mode=JiebaMode.MP, with_offsets=True) >>> text_file_dataset_1 = text_file_dataset_1.map(operations=tokenizer_op, input_columns=["text"], ... output_columns=["token", "offsets_start", "offsets_limit"], ... column_order=["token", "offsets_start", "offsets_limit"]) """ @check_jieba_init def __init__(self, hmm_path, mp_path, mode=JiebaMode.MIX, with_offsets=False): super().__init__() if not isinstance(mode, JiebaMode): raise TypeError("Wrong input type for mode, should be JiebaMode.") self.mode = mode self.__check_path__(hmm_path) self.hmm_path = hmm_path self.__check_path__(mp_path) self.mp_path = mp_path self.with_offsets = with_offsets self.words = [] def __check_path__(self, model_path): """check model path""" if not os.path.exists(os.path.realpath(model_path)): raise ValueError( " jieba mode file {} is not exist.".format(model_path)) def parse(self): jieba_tokenizer = cde.JiebaTokenizerOperation(self.hmm_path, self.mp_path, DE_C_INTER_JIEBA_MODE.get(self.mode), self.with_offsets) for word in self.words: jieba_tokenizer.add_word(word[0], word[1]) return jieba_tokenizer
[文档] @invalidate_callable @check_jieba_add_word def add_word(self, word, freq=None): """ Add a user defined word to JiebaTokenizer's dictionary. Args: word (str): The word to be added to the JiebaTokenizer instance. The added word will not be written into the built-in dictionary on disk. freq (int, optional): The frequency of the word to be added. The higher the frequency, the better chance the word will be tokenized (default=None, use default frequency). Examples: >>> from mindspore.dataset.text import JiebaMode >>> jieba_hmm_file = "/path/to/jieba/hmm/file" >>> jieba_mp_file = "/path/to/jieba/mp/file" >>> jieba_op = text.JiebaTokenizer(jieba_hmm_file, jieba_mp_file, mode=JiebaMode.MP) >>> sentence_piece_vocab_file = "/path/to/sentence/piece/vocab/file" >>> with open(sentence_piece_vocab_file, 'r') as f: ... for line in f: ... word = line.split(',')[0] ... jieba_op.add_word(word) >>> text_file_dataset = text_file_dataset.map(operations=jieba_op, input_columns=["text"]) """ if freq is None: self.words.append((word, 0)) else: self.words.append((word, freq))
[文档] @invalidate_callable @check_jieba_add_dict def add_dict(self, user_dict): """ Add a user defined word to JiebaTokenizer's dictionary. Args: user_dict (Union[str, dict]): One of the two loading methods is file path(str) loading (according to the Jieba dictionary format) and the other is Python dictionary(dict) loading, Python Dict format: {word1:freq1, word2:freq2,...}. Jieba dictionary format : word(required), freq(optional), such as: .. code-block:: word1 freq1 word2 None word3 freq3 Only valid word-freq pairs in user provided file will be added into the dictionary. Rows containing invalid input will be ignored. No error nor warning Status is returned. Examples: >>> from mindspore.dataset.text import JiebaMode >>> jieba_hmm_file = "/path/to/jieba/hmm/file" >>> jieba_mp_file = "/path/to/jieba/mp/file" >>> user_dict = {"男默女泪": 10} >>> jieba_op = text.JiebaTokenizer(jieba_hmm_file, jieba_mp_file, mode=JiebaMode.MP) >>> jieba_op.add_dict(user_dict) >>> text_file_dataset = text_file_dataset.map(operations=jieba_op, input_columns=["text"]) """ if isinstance(user_dict, str): self.__add_dict_py_file(user_dict) elif isinstance(user_dict, dict): for k, v in user_dict.items(): self.add_word(k, v) else: raise TypeError("The type of user_dict must str or dict.")
def __add_dict_py_file(self, file_path): """Add user defined word by file""" words_list = self.__parser_file(file_path) for data in words_list: if data[1] is None: freq = 0 else: freq = int(data[1]) self.add_word(data[0], freq) def __decode(self, data): """decode the dict file to utf8""" try: data = data.decode('utf-8') except UnicodeDecodeError: raise ValueError("user dict file must be utf8 format.") return data.lstrip('\ufeff') def __parser_file(self, file_path): """parser user defined word by file""" if not os.path.exists(file_path): raise ValueError( "user dict file {} is not exist.".format(file_path)) real_file_path = os.path.realpath(file_path) file_dict = open(real_file_path) data_re = re.compile('^\\s*([^\\s*]+?)\\s*([0-9]+)?\\s*$', re.U) words_list = [] for item in file_dict: data = item.strip() if not isinstance(data, str): data = self.__decode(data) tmp = data_re.match(data) if not tmp: continue words = tmp.groups() words_list.append(words) file_dict.close() return words_list
[文档]class Lookup(TextTensorOperation): """ Look up a word into an id according to the input vocabulary table. Args: vocab (Vocab): A vocabulary object. unknown_token (str, optional): Word is used for lookup. In case of the word is out of vocabulary (OOV), the result of lookup will be replaced with unknown_token. If the unknown_token is not specified or it is OOV, runtime error will be thrown (default=None, means no unknown_token is specified). data_type (mindspore.dtype, optional): The data type that lookup operation maps string to(default=mindspore.int32). Raises: TypeError: If `vocab` is not of type text.Vocab. TypeError: If `unknown_token` is not of type string. TypeError: If `data_type` is not of type mindspore.dtype. Supported Platforms: ``CPU`` Examples: >>> # Load vocabulary from list >>> vocab = text.Vocab.from_list(['深', '圳', '欢', '迎', '您']) >>> # Use Lookup operator to map tokens to ids >>> lookup = text.Lookup(vocab) >>> text_file_dataset = text_file_dataset.map(operations=[lookup]) """ @check_lookup def __init__(self, vocab, unknown_token=None, data_type=mstype.int32): super().__init__() self.vocab = vocab self.unknown_token = unknown_token self.data_type = data_type def parse(self): return cde.LookupOperation(self.vocab.c_vocab, self.unknown_token, str(mstype_to_detype(self.data_type)))
[文档]class Ngram(TextTensorOperation): """ Generate n-gram from a 1-D string Tensor. Refer to `N-gram <https://en.wikipedia.org/wiki/N-gram#Examples>`_ for an overview of what n-gram is and how it works. Args: n (list[int]): n in n-gram, which is a list of positive integers. For example, if n=[4, 3], then the result would be a 4-gram followed by a 3-gram in the same tensor. If the number of words is not enough to make up for a n-gram, an empty string will be returned. For example, 3 grams on ["mindspore", "best"] will result in an empty string produced. left_pad (tuple, optional): Padding performed on left side of the sequence shaped like ("pad_token", pad_width). `pad_width` will be capped at n-1. For example, specifying left_pad=("_", 2) would pad left side of the sequence with "__" (default=("", 0)). right_pad (tuple, optional): Padding performed on right side of the sequence shaped like ("pad_token", pad_width). `pad_width` will be capped at n-1. For example, specifying right_pad=("_", 2) would pad right side of the sequence with "__" (default=("", 0)). separator (str, optional): Symbol used to join strings together. For example, if 2-gram is ["mindspore", "amazing"] with separator="-", the result would be ["mindspore-amazing"] (default=" ", which will use whitespace as separator). Raises: TypeError: If values of `n` not positive is not of type int. ValueError: If values of `n` not positive. ValueError: If `left_pad` is not a tuple of length 2. ValueError: If `right_pad` is not a tuple of length 2. TypeError: If `separator` is not of type string. Supported Platforms: ``CPU`` Examples: >>> ngram_op = text.Ngram(3, separator="-") >>> output = ngram_op(["WildRose Country", "Canada's Ocean Playground", "Land of Living Skies"]) >>> # output >>> # ["WildRose Country-Canada's Ocean Playground-Land of Living Skies"] >>> # same ngram_op called through map >>> text_file_dataset = text_file_dataset.map(operations=ngram_op) """ @check_ngram def __init__(self, n, left_pad=("", 0), right_pad=("", 0), separator=" "): super().__init__() self.ngrams = n self.left_pad = left_pad self.right_pad = right_pad self.separator = separator def parse(self): return cde.NgramOperation(self.ngrams, self.left_pad, self.right_pad, self.separator)
[文档]class PythonTokenizer: """ Class that applies user-defined string tokenizer into input string. Args: tokenizer (Callable): Python function that takes a `str` and returns a list of `str` as tokens. Raises: TypeError: If `tokenizer` is not a callable Python function. Supported Platforms: ``CPU`` Examples: >>> def my_tokenizer(line): ... return line.split() >>> text_file_dataset = text_file_dataset.map(operations=text.PythonTokenizer(my_tokenizer)) """ @check_python_tokenizer def __init__(self, tokenizer): self.pyfunc = tokenizer self.tokenizer = np.vectorize(lambda x: np.array(tokenizer(x), dtype='U'), signature='()->(n)') self.random = False def __call__(self, in_array): if not isinstance(in_array, np.ndarray): raise TypeError("input should be a NumPy array. Got {}.".format(type(in_array))) if in_array.dtype.type is np.bytes_: in_array = to_str(in_array) try: tokens = self.tokenizer(in_array) except Exception as e: raise RuntimeError("Error occurred in Pyfunc [" + str(self.pyfunc.__name__) + "], error message: " + str(e)) return tokens def to_json(self): json_obj = {} json_obj["tensor_op_name"] = self.pyfunc.__name__ json_obj["python_module"] = self.__class__.__module__ return json.dumps(json_obj)
[文档]class SentencePieceTokenizer(TextTensorOperation): """ Tokenize scalar token or 1-D tokens to tokens by sentencepiece. Args: mode (Union[str, SentencePieceVocab]): SentencePiece model. If the input parameter is a file, it represents the path of SentencePiece mode to be loaded. If the input parameter is a SentencePieceVocab object, it should be constructed in advanced. out_type (SPieceTokenizerOutType): The type of output, it can be any of [SPieceTokenizerOutType.STRING, SPieceTokenizerOutType.INT]. - SPieceTokenizerOutType.STRING, means output type of SentencePice Tokenizer is string. - SPieceTokenizerOutType.INT, means output type of SentencePice Tokenizer is int. Raises: TypeError: If `mode` is not of type string or SentencePieceVocab. TypeError: If `out_type` is not of type SPieceTokenizerOutType. Supported Platforms: ``CPU`` Examples: >>> from mindspore.dataset.text import SentencePieceModel, SPieceTokenizerOutType >>> sentence_piece_vocab_file = "/path/to/sentence/piece/vocab/file" >>> vocab = text.SentencePieceVocab.from_file([sentence_piece_vocab_file], 5000, 0.9995, ... SentencePieceModel.UNIGRAM, {}) >>> tokenizer = text.SentencePieceTokenizer(vocab, out_type=SPieceTokenizerOutType.STRING) >>> text_file_dataset = text_file_dataset.map(operations=tokenizer) """ @check_sentence_piece_tokenizer def __init__(self, mode, out_type): super().__init__() self.mode = mode self.out_type = out_type def parse(self): self.mode = self.mode.c_sentence_piece_vocab if isinstance(self.mode, SentencePieceVocab) else self.mode return cde.SentencePieceTokenizerOperation(self.mode, DE_C_INTER_SENTENCEPIECE_OUTTYPE.get(self.out_type))
[文档]class SlidingWindow(TextTensorOperation): """ Construct a tensor from given data (only support 1-D for now), where each element in the dimension axis is a slice of data starting at the corresponding position, with a specified width. Args: width (int): The width of the window. It must be an integer and greater than zero. axis (int, optional): The axis along which the sliding window is computed (default=0). Raises: TypeError: If `width` is not of type int. ValueError: If value of `width` is not positive. TypeError: If `axis` is not of type int. Supported Platforms: ``CPU`` Examples: >>> dataset = ds.NumpySlicesDataset(data=[[1, 2, 3, 4, 5]], column_names="col1") >>> # Data before >>> # | col1 | >>> # +--------------+ >>> # | [[1, 2, 3, 4, 5]] | >>> # +--------------+ >>> dataset = dataset.map(operations=text.SlidingWindow(3, 0)) >>> # Data after >>> # | col1 | >>> # +--------------+ >>> # | [[1, 2, 3], | >>> # | [2, 3, 4], | >>> # | [3, 4, 5]] | >>> # +--------------+ """ @check_slidingwindow def __init__(self, width, axis=0): super().__init__() self.width = width self.axis = axis def parse(self): return cde.SlidingWindowOperation(self.width, self.axis)
[文档]class ToNumber(TextTensorOperation): """ Tensor operation to convert every element of a string tensor to a number. Strings are cast according to the rules specified in the following links, except that any strings which represent negative numbers cannot be cast to an unsigned integer type, rules links are as follows: https://en.cppreference.com/w/cpp/string/basic_string/stof, https://en.cppreference.com/w/cpp/string/basic_string/stoul. Args: data_type (mindspore.dtype): Type to be cast to. Must be a numeric type in mindspore.dtype. Raises: TypeError: If `data_type` is not of type mindspore.dtype. RuntimeError: If strings are invalid to cast, or are out of range after being cast. Supported Platforms: ``CPU`` Examples: >>> from mindspore import dtype as mstype >>> data = [["1", "2", "3"]] >>> dataset = ds.NumpySlicesDataset(data) >>> to_number_op = text.ToNumber(mstype.int8) >>> dataset = dataset.map(operations=to_number_op) """ @check_to_number def __init__(self, data_type): super().__init__() data_type = mstype_to_detype(data_type) self.data_type = str(data_type) def parse(self): return cde.ToNumberOperation(self.data_type)
[文档]class ToVectors(TextTensorOperation): """ Look up a token into vectors according to the input vector table. Args: vectors (Vectors): A vectors object. unk_init (sequence, optional): Sequence used to initialize out-of-vectors (OOV) token (default=None, initialize with zero vectors). lower_case_backup (bool, optional): Whether to look up the token in the lower case. If False, each token in the original case will be looked up; if True, each token in the original case will be looked up first, if not found in the keys of the property stoi, the token in the lower case will be looked up (default=False). Raises: TypeError: If `unk_init` is not of type sequence. TypeError: If elements of `unk_init` is not of type float or int. TypeError: If `lower_case_backup` is not of type bool. Supported Platforms: ``CPU`` Examples: >>> # Load vectors from file >>> vectors = text.Vectors.from_file("/path/to/vectors/file") >>> # Use ToVectors operator to map tokens to vectors >>> to_vectors = text.ToVectors(vectors) >>> text_file_dataset = text_file_dataset.map(operations=[to_vectors]) """ @check_to_vectors def __init__(self, vectors, unk_init=None, lower_case_backup=False): super().__init__() self.vectors = vectors self.unk_init = unk_init if unk_init is not None else [] self.lower_case_backup = lower_case_backup def parse(self): return cde.ToVectorsOperation(self.vectors, self.unk_init, self.lower_case_backup)
[文档]class TruncateSequencePair(TextTensorOperation): """ Truncate a pair of rank-1 tensors such that the total length is less than max_length. This operation takes two input tensors and returns two output Tensors. Args: max_length (int): Maximum length required. Raises: TypeError: If `max_length` is not of type int. Supported Platforms: ``CPU`` Examples: >>> dataset = ds.NumpySlicesDataset(data={"col1": [[1, 2, 3]], "col2": [[4, 5]]}) >>> # Data before >>> # | col1 | col2 | >>> # +-----------+-----------| >>> # | [1, 2, 3] | [4, 5] | >>> # +-----------+-----------+ >>> truncate_sequence_pair_op = text.TruncateSequencePair(max_length=4) >>> dataset = dataset.map(operations=truncate_sequence_pair_op) >>> # Data after >>> # | col1 | col2 | >>> # +-----------+-----------+ >>> # | [1, 2] | [4, 5] | >>> # +-----------+-----------+ """ @check_pair_truncate def __init__(self, max_length): super().__init__() self.max_length = max_length def parse(self): return cde.TruncateSequencePairOperation(self.max_length)
[文档]class UnicodeCharTokenizer(TextTensorOperation): """ Tokenize a scalar tensor of UTF-8 string to Unicode characters. Args: with_offsets (bool, optional): Whether or not output offsets of tokens (default=False). Raises: TypeError: If `with_offsets` is not of type bool. Supported Platforms: ``CPU`` Examples: >>> # If with_offsets=False, default output one column {["text", dtype=str]} >>> tokenizer_op = text.UnicodeCharTokenizer(with_offsets=False) >>> text_file_dataset = text_file_dataset.map(operations=tokenizer_op) >>> # If with_offsets=True, then output three columns {["token", dtype=str], ["offsets_start", dtype=uint32], >>> # ["offsets_limit", dtype=uint32]} >>> tokenizer_op = text.UnicodeCharTokenizer(with_offsets=True) >>> text_file_dataset = text_file_dataset.map(operations=tokenizer_op, input_columns=["text"], ... output_columns=["token", "offsets_start", "offsets_limit"], ... column_order=["token", "offsets_start", "offsets_limit"]) """ @check_with_offsets def __init__(self, with_offsets=False): super().__init__() self.with_offsets = with_offsets def parse(self): return cde.UnicodeCharTokenizerOperation(self.with_offsets)
[文档]class WordpieceTokenizer(TextTensorOperation): """ Tokenize the input text to subword tokens. Args: vocab (Vocab): Vocabulary used to look up words. suffix_indicator (str, optional): Prefix flags used to indicate subword suffixes. Default: '##'. max_bytes_per_token (int, optional): The maximum length of tokenization, words exceeding this length will not be split. Default: 100. unknown_token (str, optional): The output for unknown words. When set to an empty string, the corresponding unknown word will be directly returned as the output. Otherwise, the set string will be returned as the output. Default: '[UNK]'. with_offsets (bool, optional): Whether to return the offsets of tokens. Default: False. Raises: TypeError: If `vocab` is not of type :class:`mindspore.dataset.text.Vocab`. TypeError: If `suffix_indicator` is not of type str. TypeError: If `max_bytes_per_token` is not of type int. TypeError: If `unknown_token` is not of type str. TypeError: If `with_offsets` is not of type bool. ValueError: If `max_bytes_per_token` is negative. Supported Platforms: ``CPU`` Examples: >>> vocab_list = ["book", "cholera", "era", "favor", "##ite", "my", "is", "love", "dur", "##ing", "the"] >>> vocab = text.Vocab.from_list(vocab_list) >>> # If with_offsets=False, default output one column {["text", dtype=str]} >>> tokenizer_op = text.WordpieceTokenizer(vocab=vocab, unknown_token='[UNK]', ... max_bytes_per_token=100, with_offsets=False) >>> text_file_dataset = text_file_dataset.map(operations=tokenizer_op) >>> # If with_offsets=True, then output three columns {["token", dtype=str], ["offsets_start", dtype=uint32], >>> # ["offsets_limit", dtype=uint32]} >>> tokenizer_op = text.WordpieceTokenizer(vocab=vocab, unknown_token='[UNK]', ... max_bytes_per_token=100, with_offsets=True) >>> text_file_dataset = text_file_dataset.map(operations=tokenizer_op, input_columns=["text"], ... output_columns=["token", "offsets_start", "offsets_limit"], ... column_order=["token", "offsets_start", "offsets_limit"]) """ @check_wordpiece_tokenizer def __init__(self, vocab, suffix_indicator='##', max_bytes_per_token=100, unknown_token='[UNK]', with_offsets=False): super().__init__() self.vocab = vocab self.suffix_indicator = suffix_indicator self.max_bytes_per_token = max_bytes_per_token self.unknown_token = unknown_token self.with_offsets = with_offsets def parse(self): return cde.WordpieceTokenizerOperation(self.vocab.c_vocab, self.suffix_indicator, self.max_bytes_per_token, self.unknown_token, self.with_offsets)
if platform.system().lower() != 'windows': DE_C_INTER_NORMALIZE_FORM = { NormalizeForm.NONE: cde.NormalizeForm.DE_NORMALIZE_NONE, NormalizeForm.NFC: cde.NormalizeForm.DE_NORMALIZE_NFC, NormalizeForm.NFKC: cde.NormalizeForm.DE_NORMALIZE_NFKC, NormalizeForm.NFD: cde.NormalizeForm.DE_NORMALIZE_NFD, NormalizeForm.NFKD: cde.NormalizeForm.DE_NORMALIZE_NFKD }
[文档] class BasicTokenizer(TextTensorOperation): """ Tokenize the input UTF-8 encoded string by specific rules. Note: `BasicTokenizer` is not supported on Windows platform yet. Args: lower_case (bool, optional): Whether to perform lowercase processing on the text. If True, will fold the text to lower case and strip accented characters. If False, will only perform normalization on the text, with mode specified by `normalization_form`. Default: False. keep_whitespace (bool, optional): If True, the whitespace will be kept in the output. Default: False. normalization_form (NormalizeForm, optional): `Unicode normalization forms <http://unicode.org/reports/tr15/>`_, only valid when `lower_case` is False, can be NormalizeForm.NONE, NormalizeForm.NFC, NormalizeForm.NFKC, NormalizeForm.NFD or NormalizeForm.NFKD. Default: NormalizeForm.NONE. - NormalizeForm.NONE, no normalization. - NormalizeForm.NFC, Canonical Decomposition, followed by Canonical Composition. - NormalizeForm.NFKC, Compatibility Decomposition, followed by Canonical Composition. - NormalizeForm.NFD, Canonical Decomposition. - NormalizeForm.NFKD, Compatibility Decomposition. preserve_unused_token (bool, optional): Whether to preserve special tokens. If True, will not split special tokens like '[CLS]', '[SEP]', '[UNK]', '[PAD]', '[MASK]'. Default: True. with_offsets (bool, optional): Whether to return the offsets of tokens. Default: False. Raises: TypeError: If `lower_case` is not of type bool. TypeError: If `keep_whitespace` is not of type bool. TypeError: If `normalization_form` is not of type :class:`mindspore.dataset.text.NormalizeForm`. TypeError: If `preserve_unused_token` is not of type bool. TypeError: If `with_offsets` is not of type bool. RuntimeError: If dtype of input Tensor is not str. Supported Platforms: ``CPU`` Examples: >>> from mindspore.dataset.text import NormalizeForm >>> >>> # If with_offsets=False, default output one column {["text", dtype=str]} >>> tokenizer_op = text.BasicTokenizer(lower_case=False, ... keep_whitespace=False, ... normalization_form=NormalizeForm.NONE, ... preserve_unused_token=True, ... with_offsets=False) >>> text_file_dataset = text_file_dataset.map(operations=tokenizer_op) >>> # If with_offsets=True, then output three columns {["token", dtype=str], >>> # ["offsets_start", dtype=uint32], >>> # ["offsets_limit", dtype=uint32]} >>> tokenizer_op = text.BasicTokenizer(lower_case=False, ... keep_whitespace=False, ... normalization_form=NormalizeForm.NONE, ... preserve_unused_token=True, ... with_offsets=True) >>> text_file_dataset_1 = text_file_dataset_1.map(operations=tokenizer_op, input_columns=["text"], ... output_columns=["token", "offsets_start", ... "offsets_limit"], ... column_order=["token", "offsets_start", ... "offsets_limit"]) """ @check_basic_tokenizer def __init__(self, lower_case=False, keep_whitespace=False, normalization_form=NormalizeForm.NONE, preserve_unused_token=True, with_offsets=False): super().__init__() if not isinstance(normalization_form, NormalizeForm): raise TypeError("Wrong input type for normalization_form, should be enum of 'NormalizeForm'.") self.lower_case = lower_case self.keep_whitespace = keep_whitespace self.normalization_form = DE_C_INTER_NORMALIZE_FORM.get(normalization_form) self.preserve_unused_token = preserve_unused_token self.with_offsets = with_offsets def parse(self): return cde.BasicTokenizerOperation(self.lower_case, self.keep_whitespace, self.normalization_form, self.preserve_unused_token, self.with_offsets)
[文档] class BertTokenizer(TextTensorOperation): """ Tokenizer used for Bert text process. Note: `BertTokenizer` is not supported on Windows platform yet. Args: vocab (Vocab): Vocabulary used to look up words. suffix_indicator (str, optional): Prefix flags used to indicate subword suffixes. Default: '##'. max_bytes_per_token (int, optional): The maximum length of tokenization, words exceeding this length will not be split. Default: 100. unknown_token (str, optional): The output for unknown words. When set to an empty string, the corresponding unknown word will be directly returned as the output. Otherwise, the set string will be returned as the output. Default: '[UNK]'. lower_case (bool, optional): Whether to perform lowercase processing on the text. If True, will fold the text to lower case and strip accented characters. If False, will only perform normalization on the text, with mode specified by `normalization_form`. Default: False. keep_whitespace (bool, optional): If True, the whitespace will be kept in the output. Default: False. normalization_form (NormalizeForm, optional): `Unicode normalization forms <http://unicode.org/reports/tr15/>`_, only valid when `lower_case` is False, can be NormalizeForm.NONE, NormalizeForm.NFC, NormalizeForm.NFKC, NormalizeForm.NFD or NormalizeForm.NFKD. Default: NormalizeForm.NONE. - NormalizeForm.NONE, no normalization. - NormalizeForm.NFC, Canonical Decomposition, followed by Canonical Composition. - NormalizeForm.NFKC, Compatibility Decomposition, followed by Canonical Composition. - NormalizeForm.NFD, Canonical Decomposition. - NormalizeForm.NFKD, Compatibility Decomposition. preserve_unused_token (bool, optional): Whether to preserve special tokens. If True, will not split special tokens like '[CLS]', '[SEP]', '[UNK]', '[PAD]', '[MASK]'. Default: True. with_offsets (bool, optional): Whether to return the offsets of tokens. Default: False. Raises: TypeError: If `vocab` is not of type :class:`mindspore.dataset.text.Vocab`. TypeError: If `suffix_indicator` is not of type str. TypeError: If `max_bytes_per_token` is not of type int. ValueError: If `max_bytes_per_token` is negative. TypeError: If `unknown_token` is not of type str. TypeError: If `lower_case` is not of type bool. TypeError: If `keep_whitespace` is not of type bool. TypeError: If `normalization_form` is not of type :class:`mindspore.dataset.text.NormalizeForm`. TypeError: If `preserve_unused_token` is not of type bool. TypeError: If `with_offsets` is not of type bool. Supported Platforms: ``CPU`` Examples: >>> from mindspore.dataset.text import NormalizeForm >>> >>> # If with_offsets=False, default output one column {["text", dtype=str]} >>> vocab_list = ["床", "前", "明", "月", "光", "疑", "是", "地", "上", "霜", "举", "头", "望", "低", ... "思", "故", "乡","繁", "體", "字", "嘿", "哈", "大", "笑", "嘻", "i", "am", "mak", ... "make", "small", "mistake", "##s", "during", "work", "##ing", "hour", "😀", "😃", ... "😄", "😁", "+", "/", "-", "=", "12", "28", "40", "16", " ", "I", "[CLS]", "[SEP]", ... "[UNK]", "[PAD]", "[MASK]", "[unused1]", "[unused10]"] >>> vocab = text.Vocab.from_list(vocab_list) >>> tokenizer_op = text.BertTokenizer(vocab=vocab, suffix_indicator='##', max_bytes_per_token=100, ... unknown_token='[UNK]', lower_case=False, keep_whitespace=False, ... normalization_form=NormalizeForm.NONE, preserve_unused_token=True, ... with_offsets=False) >>> text_file_dataset = text_file_dataset.map(operations=tokenizer_op) >>> # If with_offsets=True, then output three columns {["token", dtype=str], >>> # ["offsets_start", dtype=uint32], >>> # ["offsets_limit", dtype=uint32]} >>> tokenizer_op = text.BertTokenizer(vocab=vocab, suffix_indicator='##', max_bytes_per_token=100, ... unknown_token='[UNK]', lower_case=False, keep_whitespace=False, ... normalization_form=NormalizeForm.NONE, preserve_unused_token=True, ... with_offsets=True) >>> text_file_dataset_1 = text_file_dataset_1.map(operations=tokenizer_op, input_columns=["text"], ... output_columns=["token", "offsets_start", ... "offsets_limit"], ... column_order=["token", "offsets_start", ... "offsets_limit"]) """ @check_bert_tokenizer def __init__(self, vocab, suffix_indicator='##', max_bytes_per_token=100, unknown_token='[UNK]', lower_case=False, keep_whitespace=False, normalization_form=NormalizeForm.NONE, preserve_unused_token=True, with_offsets=False): super().__init__() if not isinstance(normalization_form, NormalizeForm): raise TypeError("Wrong input type for normalization_form, should be enum of 'NormalizeForm'.") self.vocab = vocab self.suffix_indicator = suffix_indicator self.max_bytes_per_token = max_bytes_per_token self.unknown_token = unknown_token self.lower_case = lower_case self.keep_whitespace = keep_whitespace self.normalization_form = DE_C_INTER_NORMALIZE_FORM.get(normalization_form) self.preserve_unused_token = preserve_unused_token self.with_offsets = with_offsets def parse(self): return cde.BertTokenizerOperation(self.vocab.c_vocab, self.suffix_indicator, self.max_bytes_per_token, self.unknown_token, self.lower_case, self.keep_whitespace, self.normalization_form, self.preserve_unused_token, self.with_offsets)
[文档] class CaseFold(TextTensorOperation): """ Apply case fold operation on UTF-8 string tensor, which is aggressive that can convert more characters into lower case than :func:`str.lower`. For supported normalization forms, please refer to `ICU_Normalizer2 <https://unicode-org.github.io/icu-docs/apidoc/released/icu4c/classicu_1_1Normalizer2.html>`_ . Note: CaseFold is not supported on Windows platform yet. Supported Platforms: ``CPU`` Examples: >>> case_op = text.CaseFold() >>> text_file_dataset = text_file_dataset.map(operations=case_op) """ def parse(self): return cde.CaseFoldOperation()
[文档] class FilterWikipediaXML(TextTensorOperation): """ Filter Wikipedia XML dumps to "clean" text consisting only of lowercase letters (a-z, converted from A-Z), and spaces (never consecutive). Note: FilterWikipediaXML is not supported on Windows platform yet. Supported Platforms: ``CPU`` Examples: >>> import mindspore.dataset.text.transforms as text >>> >>> replace_op = text.FilterWikipediaXML() >>> text_file_dataset = text_file_dataset.map(operations=replace_op) """ def parse(self): return cde.FilterWikipediaXMLOperation()
[文档] class NormalizeUTF8(TextTensorOperation): """ Apply normalize operation on UTF-8 string tensor. Note: NormalizeUTF8 is not supported on Windows platform yet. Args: normalize_form (NormalizeForm, optional): Valid values can be [NormalizeForm.NONE, NormalizeForm.NFC, NormalizeForm.NFKC, NormalizeForm.NFD, NormalizeForm.NFKD] any of the four unicode normalized forms(default=NormalizeForm.NFKC). See http://unicode.org/reports/tr15/ for details. - NormalizeForm.NONE, do nothing for input string tensor. - NormalizeForm.NFC, normalize with Normalization Form C. - NormalizeForm.NFKC, normalize with Normalization Form KC. - NormalizeForm.NFD, normalize with Normalization Form D. - NormalizeForm.NFKD, normalize with Normalization Form KD. Raises: TypeError: If `normalize_form` is not of type NormalizeForm. Supported Platforms: ``CPU`` Examples: >>> from mindspore.dataset.text import NormalizeForm >>> normalize_op = text.NormalizeUTF8(normalize_form=NormalizeForm.NFC) >>> text_file_dataset = text_file_dataset.map(operations=normalize_op) """ def __init__(self, normalize_form=NormalizeForm.NFKC): super().__init__() if not isinstance(normalize_form, NormalizeForm): raise TypeError("Wrong input type for normalization_form, should be enum of 'NormalizeForm'.") normalize_form = replace_none(normalize_form, NormalizeForm.NFKC) self.normalize_form = DE_C_INTER_NORMALIZE_FORM.get(normalize_form) def parse(self): return cde.NormalizeUTF8Operation(self.normalize_form)
[文档] class RegexReplace(TextTensorOperation): """ Replace a part of UTF-8 string tensor with given text according to regular expressions. See https://unicode-org.github.io/icu/userguide/strings/regexp.html for supported regex pattern. Note: RegexReplace is not supported on Windows platform yet. Args: pattern (str): the regex expression patterns. replace (str): the string to replace matched element. replace_all (bool, optional): If False, only replace first matched element; if True, replace all matched elements (default=True). Raises: TypeError: If `pattern` is not of type string. TypeError: If `replace` is not of type string. TypeError: If `replace_all` is not of type bool. Supported Platforms: ``CPU`` Examples: >>> pattern = 'Canada' >>> replace = 'China' >>> replace_op = text.RegexReplace(pattern, replace) >>> text_file_dataset = text_file_dataset.map(operations=replace_op) """ @check_regex_replace def __init__(self, pattern, replace, replace_all=True): super().__init__() self.pattern = pattern self.replace = replace self.replace_all = replace_all def parse(self): return cde.RegexReplaceOperation(self.pattern, self.replace, self.replace_all)
[文档] class RegexTokenizer(TextTensorOperation): """ Tokenize a scalar tensor of UTF-8 string by regex expression pattern. See https://unicode-org.github.io/icu/userguide/strings/regexp.html for supported regex pattern. Note: RegexTokenizer is not supported on Windows platform yet. Args: delim_pattern (str): The pattern of regex delimiters. The original string will be split by matched elements. keep_delim_pattern (str, optional): The string matched by 'delim_pattern' can be kept as a token if it can be matched by 'keep_delim_pattern'. The default value is an empty str which means that delimiters will not be kept as an output token (default=''). with_offsets (bool, optional): Whether or not output offsets of tokens(default=False). Raises: TypeError: If `delim_pattern` is not of type string. TypeError: If `keep_delim_pattern` is not of type string. TypeError: If `with_offsets` is not of type bool. Supported Platforms: ``CPU`` Examples: >>> # If with_offsets=False, default output is one column {["text", dtype=str]} >>> delim_pattern = r"[ |,]" >>> tokenizer_op = text.RegexTokenizer(delim_pattern, with_offsets=False) >>> text_file_dataset = text_file_dataset.map(operations=tokenizer_op) >>> # If with_offsets=True, then output three columns {["token", dtype=str], >>> # ["offsets_start", dtype=uint32], >>> # ["offsets_limit", dtype=uint32]} >>> tokenizer_op = text.RegexTokenizer(delim_pattern, with_offsets=True) >>> text_file_dataset_1 = text_file_dataset_1.map(operations=tokenizer_op, input_columns=["text"], ... output_columns=["token", "offsets_start", ... "offsets_limit"], ... column_order=["token", "offsets_start", ... "offsets_limit"]) """ @check_regex_tokenizer def __init__(self, delim_pattern, keep_delim_pattern='', with_offsets=False): super().__init__() self.delim_pattern = delim_pattern self.keep_delim_pattern = keep_delim_pattern self.with_offsets = with_offsets def parse(self): return cde.RegexTokenizerOperation(self.delim_pattern, self.keep_delim_pattern, self.with_offsets)
[文档] class UnicodeScriptTokenizer(TextTensorOperation): """ Tokenize a scalar tensor of UTF-8 string based on Unicode script boundaries. Note: UnicodeScriptTokenizer is not supported on Windows platform yet. Args: keep_whitespace (bool, optional): Whether or not emit whitespace tokens (default=False). with_offsets (bool, optional): Whether or not output offsets of tokens (default=False). Raises: TypeError: If `keep_whitespace` is not of type bool. TypeError: If `with_offsets` is not of type bool. Supported Platforms: ``CPU`` Examples: >>> # If with_offsets=False, default output one column {["text", dtype=str]} >>> tokenizer_op = text.UnicodeScriptTokenizer(keep_whitespace=True, with_offsets=False) >>> text_file_dataset = text_file_dataset.map(operations=tokenizer_op) >>> # If with_offsets=True, then output three columns {["token", dtype=str], >>> # ["offsets_start", dtype=uint32], >>> # ["offsets_limit", dtype=uint32]} >>> tokenizer_op = text.UnicodeScriptTokenizer(keep_whitespace=True, with_offsets=True) >>> text_file_dataset = text_file_dataset.map(operations=tokenizer_op, input_columns=["text"], ... output_columns=["token", "offsets_start", "offsets_limit"], ... column_order=["token", "offsets_start", "offsets_limit"]) """ @check_unicode_script_tokenizer def __init__(self, keep_whitespace=False, with_offsets=False): super().__init__() keep_whitespace = replace_none(keep_whitespace, False) with_offsets = replace_none(with_offsets, False) self.keep_whitespace = keep_whitespace self.with_offsets = with_offsets def parse(self): return cde.UnicodeScriptTokenizerOperation(self.keep_whitespace, self.with_offsets)
[文档] class WhitespaceTokenizer(TextTensorOperation): """ Tokenize a scalar tensor of UTF-8 string on ICU4C defined whitespaces, such as: ' ', '\\\\t', '\\\\r', '\\\\n'. Note: WhitespaceTokenizer is not supported on Windows platform yet. Args: with_offsets (bool, optional): Whether or not output offsets of tokens (default=False). Raises: TypeError: If `with_offsets` is not of type bool. Supported Platforms: ``CPU`` Examples: >>> # If with_offsets=False, default output one column {["text", dtype=str]} >>> tokenizer_op = text.WhitespaceTokenizer(with_offsets=False) >>> text_file_dataset = text_file_dataset.map(operations=tokenizer_op) >>> # If with_offsets=True, then output three columns {["token", dtype=str], >>> # ["offsets_start", dtype=uint32], >>> # ["offsets_limit", dtype=uint32]} >>> tokenizer_op = text.WhitespaceTokenizer(with_offsets=True) >>> text_file_dataset = text_file_dataset.map(operations=tokenizer_op, input_columns=["text"], ... output_columns=["token", "offsets_start", "offsets_limit"], ... column_order=["token", "offsets_start", "offsets_limit"]) """ @check_with_offsets def __init__(self, with_offsets=False): super().__init__() self.with_offsets = with_offsets def parse(self): return cde.WhitespaceTokenizerOperation(self.with_offsets)