lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Michael McCandless (JIRA)" <>
Subject [jira] Updated: (LUCENE-2286) enable DefaultSimilarity.setDiscountOverlaps by default
Date Thu, 25 Feb 2010 18:15:27 GMT


Michael McCandless updated LUCENE-2286:

    Fix Version/s: 3.1

> enable DefaultSimilarity.setDiscountOverlaps by default
> -------------------------------------------------------
>                 Key: LUCENE-2286
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Query/Scoring
>            Reporter: Robert Muir
>             Fix For: 3.1
>         Attachments: LUCENE-2286.patch
> I think we should enable setDiscountOverlaps in DefaultSimilarity by default.
> If you are using synonyms or commongrams or a number of other 0-posInc-term-injecting
methods, these currently screw up your length normalization.
> These terms have a position increment of zero, so they shouldnt count towards the length
of the document.
> I've done relevance tests with persian showing the difference is significant, and i think
its a big trap to anyone using synonyms, etc: your relevance can actually get worse if you
don't flip this boolean flag.

This message is automatically generated by JIRA.
You can reply to this email to add a comment to the issue online.

To unsubscribe, e-mail:
For additional commands, e-mail:

View raw message