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From "Grant Ingersoll (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1896) Modify confusing javadoc for queryNorm
Date Tue, 08 Sep 2009 14:07:57 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12752530#action_12752530
] 

Grant Ingersoll commented on LUCENE-1896:
-----------------------------------------

I know the queryNorm was based on some long ago research on it, but I don't know that it has
proven to be all that useful.  There are certainly others who have done work on this, too.
 In the end, I don't think the current implementation is all that useful and we could likely
save a few ops by removing it, or giving people more powerful ways of changing it.

The bottom line, I think, is you shouldn't compare scores across queries.  Often times, you
can't even compare scores for the same query if the underlying index changed.  I also don't
understand Marvin's comment about "completeness in the implementation of cosine similarity"
nor the comment about scores being "closer together than farther apart".

> Modify confusing javadoc for queryNorm
> --------------------------------------
>
>                 Key: LUCENE-1896
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1896
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Javadocs
>            Reporter: Jiri Kuhn
>            Priority: Minor
>             Fix For: 2.9
>
>
> See http://markmail.org/message/arai6silfiktwcer
> The javadoc confuses me as well.

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