tokenizer#
- class SkepTokenizer(vocab_file, bpe_vocab_file=None, bpe_json_file=None, do_lower_case=True, use_bpe_encoder=False, need_token_type_id=True, add_two_sep_token_inter=False, unk_token='[UNK]', sep_token='[SEP]', pad_token='[PAD]', cls_token='[CLS]', mask_token='[MASK]', **kwargs)[源代码]#
-
Constructs a Skep tokenizer. It uses a basic tokenizer to do punctuation splitting, lower casing and so on, and follows a WordPiece tokenizer to tokenize as subwords.
This tokenizer inherits from
PretrainedTokenizer
which contains most of the main methods. For more information regarding those methods, please refer to this superclass.- 参数:
vocab_file (str) -- The vocabulary file path (ends with '.txt') required to instantiate a
WordpieceTokenizer
.bpe_vocab_file (str, optional) -- The vocabulary file path of a
BpeTokenizer
. Defaults toNone
.bpe_json_file (str, optional) -- The json file path of a
BpeTokenizer
. Defaults toNone
.use_bpe_encoder (bool, optional) -- Whether or not to use BPE Encoder. Defaults to
False
.need_token_type_id (bool, optional) -- Whether or not to use token type id. Defaults to
True
.add_two_sep_token_inter (bool, optional) -- Whether or not to add two different
sep_token
. Defaults toFalse
.unk_token (str, optional) -- The special token for unknown words. Defaults to "[UNK]".
sep_token (str, optional) -- The special token for separator token. Defaults to "[SEP]".
pad_token (str, optional) -- The special token for padding. Defaults to "[PAD]".
cls_token (str, optional) -- The special token for cls. Defaults to "[CLS]".
mask_token (str, optional) -- The special token for mask. Defaults to "[MASK]".
示例
from paddlenlp.transformers import SkepTokenizer tokenizer = SkepTokenizer.from_pretrained('skep_ernie_2.0_large_en') encoded_inputs = tokenizer('He was a puppeteer') # encoded_inputs: # { # 'input_ids': [101, 2002, 2001, 1037, 13997, 11510, 102], # 'token_type_ids': [0, 0, 0, 0, 0, 0, 0] # }
- property vocab_size#
Return the size of vocabulary.
- 返回:
the size of vocabulary.
- 返回类型:
int
- num_special_tokens_to_add(pair=False)[源代码]#
Returns the number of added tokens when encoding a sequence with special tokens.
- 参数:
pair (bool, optional) -- Returns the number of added tokens in the case of a sequence pair if set to True, returns the number of added tokens in the case of a single sequence if set to False. Defaults to False.
- 返回:
Number of tokens added to sequences
- 返回类型:
int
- build_offset_mapping_with_special_tokens(offset_mapping_0, offset_mapping_1=None)[源代码]#
Build offset map from a pair of offset map by concatenating and adding offsets of special tokens.
Should be overridden in a subclass if the model has a special way of building those.
- 参数:
offset_mapping_0 (List[tuple]) -- List of char offsets to which the special tokens will be added.
offset_mapping_1 (List[tuple], optional) -- Optional second list of char offsets for offset mapping pairs.
- 返回:
List of char offsets with the appropriate offsets of special tokens.
- 返回类型:
List[tuple]
- build_inputs_with_special_tokens(token_ids_0, token_ids_1=None)[源代码]#
Build model inputs from a sequence or a pair of sequence for sequence classification tasks by concatenating and adding special tokens.
A skep_ernie_1.0_large_ch/skep_ernie_2.0_large_en sequence has the following format:
single sequence:
[CLS] X [SEP]
pair of sequences:
[CLS] A [SEP] B [SEP]
A skep_roberta_large_en sequence has the following format:
single sequence:
[CLS] X [SEP]
pair of sequences:
[CLS] A [SEP] [SEP] B [SEP]
- 参数:
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. Defaults to
None
.
- 返回:
List of input_id with the appropriate special tokens.
- 返回类型:
list[int]
- create_token_type_ids_from_sequences(token_ids_0, token_ids_1=None)[源代码]#
Create a mask from the two sequences passed to be used in a sequence-pair classification task.
A skep_ernie_1.0_large_ch/skep_ernie_2.0_large_en 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
isNone
, this method only returns the first portion of the mask (0s).note: There is no need token type ids for skep_roberta_large_ch model.
- 参数:
token_ids_0 (List[int]) -- List of IDs.
token_ids_1 (List[int], optional) -- Optional second list of IDs for sequence pairs. Defaults to
None
.
- 返回:
List of token_type_id according to the given sequence(s).
- 返回类型:
List[int]
- save_resources(save_directory)[源代码]#
Save tokenizer related resources to files under
save_directory
.- 参数:
save_directory (str) -- Directory to save files into.
- convert_tokens_to_string(tokens: List[str])[源代码]#
Converts a sequence of tokens (list of string) in a single string.
- 参数:
tokens (list) -- A list of string representing tokens to be converted.
- 返回:
Converted string from tokens.
- 返回类型:
str
示例
from paddlenlp.transformers import RoFormerTokenizer tokenizer = RoFormerTokenizer.from_pretrained('roformer-chinese-base') tokens = tokenizer.tokenize('欢迎使用百度飞桨') #['欢迎', '使用', '百度', '飞', '桨'] strings = tokenizer.convert_tokens_to_string(tokens) #'欢迎 使用 百度 飞 桨'
- get_special_tokens_mask(token_ids_0: List[int], token_ids_1: List[int] | None = None, already_has_special_tokens: bool = False) List[int] [源代码]#
Retrieve sequence ids from a token list that has no special tokens added. This method is called when adding special tokens using the tokenizer
prepare_for_model
method.- 参数:
token_ids_0 (
List[int]
) -- List of IDs.token_ids_1 (
List[int]
, optional) -- Optional second list of IDs for sequence pairs.already_has_special_tokens (
bool
, optional, defaults toFalse
) -- Whether or not the token list is already formatted with special tokens for the model.
- 返回:
1 for a special token, 0 for a sequence token.
- 返回类型:
A list of integers in the range [0, 1]