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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2936) score and explain don't match
Date Wed, 23 Feb 2011 14:10:38 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12998376#comment-12998376
] 

Robert Muir commented on LUCENE-2936:
-------------------------------------

{quote}
Isn't that a bug?
We fixed our search code to not discard negative scores, so explain should also handle that?
{quote}

I agree this is a bad assumption really (although subclasses can override). I am just concerned
what explains will 'break' if we fix this.

But still i think the float quantization issue (the root cause of this problem really) should
be fixed... ideally we fix both!


> score and explain don't match
> -----------------------------
>
>                 Key: LUCENE-2936
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2936
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 2.9.4, 3.0.3, 3.1, 4.0
>            Reporter: Koji Sekiguchi
>            Assignee: Robert Muir
>            Priority: Minor
>         Attachments: LUCENE-2936.patch, LUCENE-2936.patch, TestScore.java
>
>
> I've faced this problem recently. I'll attach a program to reproduce the problem soon.
The program outputs the following:
> {noformat}
> ** score = 0.10003257
> ** explain
> 0.050016284 = (MATCH) product of:
>   0.15004885 = (MATCH) sum of:
>     0.15004885 = weight(f1:"note book" in 0), product of:
>       0.3911943 = queryWeight(f1:"note book"), product of:
>         0.61370564 = idf(f1: note=1 book=1)
>         0.6374299 = queryNorm
>       0.38356602 = fieldWeight(f1:"note book" in 0), product of:
>         1.0 = tf(phraseFreq=1.0)
>         0.61370564 = idf(f1: note=1 book=1)
>         0.625 = fieldNorm(field=f1, doc=0)
>   0.33333334 = coord(1/3)
> {noformat}

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