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Change IDF formula #1141

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Change IDF formula #1141

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3bce4de
Change IDF formula
lmores Jan 21, 2023
335adc7
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lmores Jan 21, 2023
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4 changes: 2 additions & 2 deletions dedupe/canopy_index.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,8 +4,8 @@
import math
from typing import Iterable

import numpy
from BTrees.Length import Length
from numpy import log
from zope.index.text.cosineindex import CosineIndex
from zope.index.text.lexicon import Lexicon
from zope.index.text.setops import mass_weightedUnion
Expand Down Expand Up @@ -37,7 +37,7 @@ def initSearch(self) -> None:
docs = bucket(docs)
self.index._wordinfo[wid] = docs

idf = numpy.log1p(N / len(docs))
idf = 1 + log((1 + N) / (1 + len(docs)))
term = self.lexicon._words[wid]

self._wids_dict[term] = (wid, idf)
Expand Down