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Update rank_bm25.py to avoid zero division #33

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Update rank_bm25.py to avoid zero division #33

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2 changes: 1 addition & 1 deletion rank_bm25.py
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Original file line number Diff line number Diff line change
Expand Up @@ -98,7 +98,7 @@ def _calc_idf(self, nd):
idf_sum += idf
if idf < 0:
negative_idfs.append(word)
self.average_idf = idf_sum / len(self.idf)
self.average_idf = idf_sum / (len(self.idf) + 1e-9)

eps = self.epsilon * self.average_idf
for word in negative_idfs:
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