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Return set of symbol pairs in a word.
Word is represented as tuple of symbols (symbols being variable-length strings).
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Constructs a BERTweet tokenizer, using Byte-Pair-Encoding.
This tokenizer inherits from [`PreTrainedTokenizer`] which contains most of the main methods. Users should refer to
this superclass for more information regarding those methods.
Args:
vocab_file (`str`):
Path to the vocabulary file.
merges_file (`str`):
Path to the merges file.
normalization (`bool`, *optional*, defaults to `False`):
Whether or not to apply a normalization preprocess.
bos_token (`str`, *optional*, defaults to `""`):
The beginning of sequence token that was used during pretraining. Can be used a sequence classifier token.
When building a sequence using special tokens, this is not the token that is used for the beginning of
sequence. The token used is the `cls_token`.
eos_token (`str`, *optional*, defaults to `""`):
The end of sequence token.
When building a sequence using special tokens, this is not the token that is used for the end of sequence.
The token used is the `sep_token`.
sep_token (`str`, *optional*, defaults to `""`):
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.
cls_token (`str`, *optional*, defaults to `""`):
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.
unk_token (`str`, *optional*, defaults to `""`):
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.
pad_token (`str`, *optional*, defaults to `""`):
The token used for padding, for example when batching sequences of different lengths.
mask_token (`str`, *optional*, defaults to `""`):
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.
F X `
- pair of sequences: ` A B `
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.
N) cls_token_id sep_token_id)rH rL rM clssepr r r build_inputs_with_special_tokens s
z2BertweetTokenizer.build_inputs_with_special_tokens)rL rM already_has_special_tokensrN c sh |rt j||ddS |du r8dgdgt| dg S dgdgt| ddg dgt| dg S )a
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.
Args:
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 to `False`):
Whether or not the token list is already formatted with special tokens for the model.
Returns:
`list[int]`: A list of integers in the range [0, 1]: 1 for a special token, 0 for a sequence token.
T)rL rM rT Nr r )rF get_special_tokens_maskr@ )rH rL rM rT rJ r r rU s z)BertweetTokenizer.get_special_tokens_maskc C sP | j g}| jg}|du r.t|| | dg S t|| | | | | dg S )a
Create a mask from the two sequences passed to be used in a sequence-pair classification task. BERTweet does
not make use of token type ids, therefore a list of zeros is returned.
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 zeros.
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Normalize a raw Tweet
rp c s g | ]} |qS r )normalizeToken)r rj rX r r r' ; r z4BertweetTokenizer.normalizeTweet..zcannot zcan not zn't z n't zn 't zca n'tzcan'tzai n'tzain'tz'm z 'm z're z 're z's z 's z'll z 'll z'd z 'd z've z 've z p . m .z p.m.z p . m z p.m z a . m .z a.m.z a . m z a.m )rE replacerD tokenizeri r% )rH ZtweetpuncttokensZ normTweetr rX r rq 3 sF
z BertweetTokenizer.normalizeTweetc C sp | }|drdS |ds*|dr.dS t|dkrh|| jv rN| j| S | jdurb| |S |S n|S dS )z-
Normalize tokens in a Tweet
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z BertweetTokenizer.normalizeTokenc C s | j || j | jS )z0Converts a token (str) in an id using the vocab.)r6 r\ r. )rH rj r r r _convert_token_to_idh s z&BertweetTokenizer._convert_token_to_idc C s | j || jS )z=Converts an index (integer) in a token (str) using the vocab.)r: r\ r. )rH re r r r _convert_id_to_tokenl s z&BertweetTokenizer._convert_id_to_tokenc C s d |dd }|S )z:Converts a sequence of tokens (string) in a single string.rp ra )ri rx strip)rH r{ Z
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[:;=8] # eyes
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[<>]?
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)u # Capture 1: entire matched URL
(?:
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(?: # One or more:
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| # or
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|
\([^\s]+?\) # balanced parens, non-recursive: (...)
)+
(?: # End with:
\([^\s()]*?\([^\s()]+\)[^\s()]*?\) # balanced parens, one level deep: (...(...)...)
|
\([^\s]+?\) # balanced parens, non-recursive: (...)
| # or
[^\s`!()\[\]{};:'".,<>?«»“”‘’] # not a space or one of these punct chars
)
| # OR, the following to match naked domains:
(?:
(?\s]+>z
[\-]+>|<[\-]+z (?:@[\w_]+)z (?:\#+[\w_]+[\w\'_\-]*[\w_]+)z#[\w.+-]+@[\w-]+\.(?:[\w-]\.?)+[\w-]a
(?:[^\W\d_](?:[^\W\d_]|['\-_])+[^\W\d_]) # Words with apostrophes or dashes.
|
(?:[+\-]?\d+[,/.:-]\d+[+\-]?) # Numbers, including fractions, decimals.
|
(?:[\w_]+) # Words without apostrophes or dashes.
|
(?:\.(?:\s*\.){1,}) # Ellipsis dots.
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(?:\S) # Everything else that isn't whitespace.
z(%s)|z([^a-zA-Z0-9])\1{3,}z&(#?(x?))([^&;\s]+);strictc C s& |d u r d}t | tr"| ||S | S )Nr )r bytesdecode)rt r! errorsr r r _str_to_unicode\ s
r r Tr c s fdd}t |t| |S )u
Remove entities from text by converting them to their corresponding unicode character.
Args:
text:
A unicode string or a byte string encoded in the given *encoding* (which defaults to 'utf-8').
keep (list):
List of entity names which should not be replaced. This supports both numeric entities (`&#nnnn;` and
`&#hhhh;`) and named entities (such as ` ` or `>`).
remove_illegal (bool):
If `True`, entities that can't be converted are removed. Otherwise, entities that can't be converted are
kept "as is".
Returns: A unicode string with the entities removed.
See https://github.com/scrapy/w3lib/blob/master/w3lib/html.py
Examples:
```python
>>> from nltk.tokenize.casual import _replace_html_entities
>>> _replace_html_entities(b"Price: £100")
'Price: \xa3100'
>>> print(_replace_html_entities(b"Price: £100"))
Price: £100
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Examples:
```python
>>> # Tokenizer for tweets.
>>> from nltk.tokenize import TweetTokenizer
>>> tknzr = TweetTokenizer()
>>> s0 = "This is a cooool #dummysmiley: :-) :-P <3 and some arrows < > -> <--"
>>> tknzr.tokenize(s0)
['This', 'is', 'a', 'cooool', '#dummysmiley', ':', ':-)', ':-P', '<3', 'and', 'some', 'arrows', '<', '>', '->', '<--']
>>> # Examples using *strip_handles* and *reduce_len parameters*:
>>> tknzr = TweetTokenizer(strip_handles=True, reduce_len=True)
>>> s1 = "@remy: This is waaaaayyyy too much for you!!!!!!"
>>> tknzr.tokenize(s1)
[':', 'This', 'is', 'waaayyy', 'too', 'much', 'for', 'you', '!', '!', '!']
```TFc C s || _ || _|| _d S rW
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Args:
text: str
Returns: list(str) A tokenized list of strings; concatenating this list returns the original string if
`preserve_case=False`
\1\1\1c S s" g | ]}t |r|n| qS r ) EMOTICON_REsearchr~ )r xr r r r' r z+TweetTokenizer.tokenize..)
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Replace repeated character sequences of length 3 or greater with sequences of length 3.
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Remove Twitter username handles from text.
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