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From "Uwe Schindler" <...@thetaphi.de>
Subject RE: [jira] Commented: (LUCENE-1534) idf(t) is not actually squared during scoring?
Date Tue, 03 Feb 2009 22:05:43 GMT
On java-user a question about "term frequency normalization" and changing
Similarity appeared, too.

Uwe

-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: uwe@thetaphi.de

> -----Original Message-----
> From: Grant Ingersoll [mailto:gsingers@apache.org]
> Sent: Tuesday, February 03, 2009 10:59 PM
> To: java-dev@lucene.apache.org
> Subject: Re: [jira] Commented: (LUCENE-1534) idf(t) is not actually
> squared during scoring?
> 
> We should probably have that discussion (changing default Sim) on java-
> dev, not on a particular JIRA issue.  I, for one, am interested in
> having the discussion.
> 
> 
> On Feb 3, 2009, at 3:35 PM, Doug Cutting (JIRA) wrote:
> 
> >
> >    [ https://issues.apache.org/jira/browse/LUCENE-
> 1534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-
> tabpanel&focusedCommentId=12670103
> > #action_12670103 ]
> >
> > Doug Cutting commented on LUCENE-1534:
> > --------------------------------------
> >
> > Now, on the cusp of 3.0, might be a good time to think about
> > changing the default ranking algorithm.  This is potentially a
> > disruptive change, but we can easily provide a back-compatible
> > Similarity implementation.  Are there other changes to the default
> > Similarity that may be of general utility?  Or do folks thinks its
> > better to leave this alone?
> >
> >> idf(t) is not actually squared during scoring?
> >> ----------------------------------------------
> >>
> >>                Key: LUCENE-1534
> >>                URL: https://issues.apache.org/jira/browse/LUCENE-1534
> >>            Project: Lucene - Java
> >>         Issue Type: Bug
> >>         Components: Query/Scoring
> >>   Affects Versions: 2.1, 2.2, 2.3, 2.3.1, 2.3.2, 2.4
> >>           Reporter: Michael McCandless
> >>           Assignee: Michael McCandless
> >>           Priority: Minor
> >>            Fix For: 2.9
> >>
> >>
> >> The javadocs for Similarity:
> >>
> http://lucene.apache.org/java/2_4_0/api/org/apache/lucene/search/Similarit
> y.html
> >> show idf(t) as being squared when computing net query score.  But I
> >> don't think it is actually squared, in looking at the sources?  Maybe
> >> it used to be, eg this interesting discussion:
> >>  http://markmail.org/message/k5pl7scmiac5wosb
> >> Or am I missing something?  We just need to fix the javadocs to take
> >> away the "squared"...
> >
> > --
> > This message is automatically generated by JIRA.
> > -
> > You can reply to this email to add a comment to the issue online.
> >
> >
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> 
> 
> 
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