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From "Doron Cohen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-736) Sloppy Phrase Scoring Misbehavior
Date Mon, 04 Dec 2006 21:10:24 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-736?page=comments#action_12455422 ] 
            
Doron Cohen commented on LUCENE-736:
------------------------------------

There is a bug in my recent patch (sloppy_phrase.patch2.txt):
- for the case of phrase with repetitions, some additional computation is required before
starting each doc. 
- this does not affect the regular/common case of phrase with no repetitions.
I extended the test to expose this and will commit an updated patch later today.

> Sloppy Phrase Scoring Misbehavior
> ---------------------------------
>
>                 Key: LUCENE-736
>                 URL: http://issues.apache.org/jira/browse/LUCENE-736
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Search
>            Reporter: Doron Cohen
>         Assigned To: Doron Cohen
>            Priority: Minor
>         Attachments: perf-search-new.log, perf-search-orig.log, res-search-new2.log,
res-search-orig2.log, sloppy_phrase.patch2.txt, sloppy_phrase_java.patch.txt, sloppy_phrase_tests.patch.txt
>
>
> This is an extension of https://issues.apache.org/jira/browse/LUCENE-697
> In addition to abnormalities Yonik pointed out in 697, there seem to be other issues
with slopy phrase search and scoring.
> 1) A phrase with a repeated word would be detected in a document although it is not there.
> I.e. document = A B D C E , query = "B C B" would not find this document (as expected),
but query "B C B"~2 would find it. 
> I think that no matter how large the slop is, this document should not be a match.
> 2) A document containing both orders of a query, symmetrically, would score differently
for the queru and for its reveresed form.
> I.e. document = A B C B A would score differently for queries "B C"~2 and "C B"~2, although
it is symmetric to both.
> I will attach test cases that show both these problems and the one reported by Yonik
in 697. 

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