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Update _tfidf.py to allow for sentence-level TFIDF ngram-matching #44

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Update _tfidf.py to allow for sentence-level TFIDF ngram-matching #44

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3aa14be
Update _tfidf.py
DGaffney Sep 10, 2022
68315cd
Update _tfidf.py
DGaffney Sep 10, 2022
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19 changes: 14 additions & 5 deletions polyfuzz/models/_tfidf.py
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Original file line number Diff line number Diff line change
Expand Up @@ -51,7 +51,8 @@ def __init__(self,
min_similarity: float = 0.75,
top_n: int = 1,
cosine_method: str = "sparse",
model_id: str = None):
model_id: str = None,
use_word_grams: bool = False):
super().__init__(model_id)
self.type = "TF-IDF"
self.n_gram_range = n_gram_range
Expand All @@ -61,6 +62,7 @@ def __init__(self,
self.top_n = top_n
self.vectorizer = None
self.tf_idf_to = None
self.use_word_grams = use_word_grams

def match(self,
from_list: List[str],
Expand Down Expand Up @@ -125,10 +127,17 @@ def _create_ngrams(self, string: str) -> List[str]:
string = _clean_string(string)

result = []
for n in range(self.n_gram_range[0], self.n_gram_range[1]+1):
ngrams = zip(*[string[i:] for i in range(n)])
ngrams = [''.join(ngram) for ngram in ngrams if ' ' not in ngram]
result.extend(ngrams)
if self.use_word_grams:
tokens = [token for token in string.split(" ") if token != ""]
for n in range(self.n_gram_range[0], self.n_gram_range[1]+1):
ngrams = zip(*[tokens[i:] for i in range(n)])
ngrams = [''.join(ngram) for ngram in ngrams if ' ' not in ngram]
result.extend(ngrams)
else:
for n in range(self.n_gram_range[0], self.n_gram_range[1]+1):
ngrams = zip(*[string[i:] for i in range(n)])
ngrams = [''.join(ngram) for ngram in ngrams if ' ' not in ngram]
result.extend(ngrams)

return result

Expand Down