Residual IDF calculation in the pruning package is wrong
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Key: LUCENE-3934
URL: https://issues.apache.org/jira/browse/LUCENE-3934
Project: Lucene - Java
Issue Type: Bug
Affects Versions: 3.5, 3.6
Reporter: Andrzej Bialecki
Assignee: Andrzej Bialecki
As discussed on the mailing list (http://markmail.org/message/cwnyfqmet3wophec)
there seems to be a bug in both the formula and in the way RIDF is calculated.
The formula is missing a minus, but also the calculation uses local
(in-document) term frequency instead of the total term frequency (sum of all
term occurrences in a corpus).
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