[jira] [Updated] (LUCENE-3934) Residual IDF calculation in the pruning package is wrong

["Andrzej Bialecki (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-3934?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrzej Bialecki  updated LUCENE-3934:
--------------------------------------

    Attachment: LUCENE-3934.patch

Patch that fixes the issue. Added unit test. If no objections I'll commit shortly.
                
> Residual IDF calculation in the pruning package is wrong
> --------------------------------------------------------
>
>                 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 
>         Attachments: LUCENE-3934.patch
>
>
> 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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