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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1534) idf(t) is not actually squared during scoring?
Date Mon, 02 Feb 2009 18:15:59 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12669673#action_12669673
] 

Yonik Seeley commented on LUCENE-1534:
--------------------------------------

Right.... and explain explains it by having 1 idf factor in the queryWeight and 1 in the fieldWeight:

{code}
0.6433005 = (MATCH) weight(text:solr in 14), product of:
  0.99999994 = queryWeight(text:solr), product of:
    3.6390574 = idf(docFreq=1, numDocs=26)
    0.27479643 = queryNorm
  0.64330053 = (MATCH) fieldWeight(text:solr in 14), product of:
    1.4142135 = tf(termFreq(text:solr)=2)
    3.6390574 = idf(docFreq=1, numDocs=26)
    0.125 = fieldNorm(field=text, doc=14)
{code}


> 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/Similarity.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"...

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