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From "Robert Muir (Commented) (JIRA)" <>
Subject [jira] [Commented] (LUCENE-3934) Residual IDF calculation in the pruning package is wrong
Date Thu, 29 Mar 2012 09:52:28 GMT


Robert Muir commented on LUCENE-3934:

This seems bad: Andrzej is this something thats not too difficult to fix for 3.6?
> Residual IDF calculation in the pruning package is wrong
> --------------------------------------------------------
>                 Key: LUCENE-3934
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 3.5, 3.6
>            Reporter: Andrzej Bialecki 
>            Assignee: Andrzej Bialecki 
> As discussed on the mailing list ( 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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