def test_ngram_tokenizer_equivalence_2():
t = NGramsTokenizer([1, 2, 3])
ret = []
for i in [1, 2, 3]:
ret.extend(NGramsTokenizer(i)(example))
assert t(example) == ret
def test_ngram_tokenizer_stopwords():
tokenizer = NGramsTokenizer(2, exclude_stopwords=True)
dummy = "justo. Praesent the luctus."
assert tokenizer(dummy) == ['justo .', '. Praesent', 'Praesent luctus', 'luctus .']
tokenizer = NGramsTokenizer(1, exclude_stopwords=True)
dummy = "justo. Praesent the luctus."
assert tokenizer(dummy) == ['justo', '.', 'Praesent', 'luctus', '.']
tokenizer = NGramsTokenizer(2, exclude_stopwords=True, stop_words=["Praesent", "the"])
dummy = "justo. Praesent the luctus."
assert tokenizer(dummy) == ['justo .', '. luctus', 'luctus .']
def test_ngram_tokenizer():
tokenizer = NGramsTokenizer(2)
dummy = "justo. Praesent luctus."
assert tokenizer(dummy) == ["justo. Praesent", "Praesent luctus."]
dummy = ""
assert tokenizer(dummy) == []
def test_ngram_tokenizer():
tokenizer = NGramsTokenizer(2)
dummy = "justo. Praesent luctus."
assert tokenizer(dummy) == ['justo .', '. Praesent', 'Praesent luctus', 'luctus .']
dummy = ""
assert tokenizer(dummy) == []
def __init__(self, # nosec
tokenizer: Optional[Tokenizer] = None,
lower: bool = False,
unk_token: str = '<unk>',
min_freq: int = 5,
normalize: bool = False,
scale_factor: float = None) -> None:
"""Initialize the BoW object.
Parameters
----------
tokenizer : Tokenizer, optional
Tokenizer to use, by default NGramsTokenizer()
lower : bool, optional
If given, lowercase the input, by default False
unk_token : str, optional
The token to use for out of vocabulary tokens
(defaults to '<unk>')
min_freq : int, optional
Minimum frequency to include token in the vocabulary
(defaults to 5)
normalize : bool, optional
Normalize or not the bag of words using L1 norm
(defaults to False)
scale_factor : float, optional
Factor to scale the resulting normalized feature value.
Only available when normalize is True (defaults to 1.0)
"""
self.tokenizer = tokenizer or NGramsTokenizer()
self.lower = lower
self.unk = unk_token
self.min_freq = min_freq
self.normalize = normalize
self.scale_factor = scale_factor
self.vocab: Dict[str, int] = odict()
self.vocab[unk_token] = 0
self.full_vocab: Dict[str, int] = {}
if scale_factor and not normalize:
raise ValueError(f"Cannot specify scale_factor without normalizing")
self.register_attrs('vocab', 'full_vocab')
def test_ngram_tokenizer_equivalence():
t1 = NGramsTokenizer(1)
t2 = WordTokenizer()
assert t1(example) == t2(example)