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Debug BM25Okapi #26

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Debug BM25Okapi #26

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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 @@ -100,7 +100,7 @@ def _calc_idf(self, nd):
negative_idfs.append(word)
self.average_idf = idf_sum / len(self.idf)

eps = self.epsilon * self.average_idf
eps = max(self.epsilon * self.average_idf, 0.001) # average_idf must be positive
for word in negative_idfs:
self.idf[word] = eps

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