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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5221) SimilarityBase.computeNorm is inconsistent with TFIDFSimilarity
Date Wed, 18 Sep 2013 15:43:52 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13770893#comment-13770893
] 

ASF subversion and git services commented on LUCENE-5221:
---------------------------------------------------------

Commit 1524463 from [~rcmuir] in branch 'dev/branches/branch_4x'
[ https://svn.apache.org/r1524463 ]

LUCENE-5221: SimilarityBase.computeNorm is inconsistent with TFIDFSimilarity
                
> SimilarityBase.computeNorm is inconsistent with TFIDFSimilarity
> ---------------------------------------------------------------
>
>                 Key: LUCENE-5221
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5221
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/search
>    Affects Versions: 4.4
>            Reporter: Yubin Kim
>              Labels: normalize, search, similarity
>         Attachments: LUCENE-5221.patch, LUCENE-5221.patch
>
>
> {{SimilarityBase.computeNorm}} Javadoc indicates that the doc length should be encoded
in the same way as {{TFIDFSimilarity}}. However, when {{discountOverlaps}} is {{false}}, what
gets encoded is {{SmallFloat.floatToByte315((boost / (float) Math.sqrt(docLen / boost)));}}
rather than  {{SmallFloat.floatToByte315((boost / (float) Math.sqrt(length)));}} due to the
extra {{/ state.getBoost()}} term in {{SimilarityBase.computeNorm}}: 
>   final float numTerms;
>   if (discountOverlaps)
>     numTerms = state.getLength() - state.getNumOverlap();
>   else
>     numTerms = state.getLength() */ state.getBoost();*
>   return encodeNormValue(state.getBoost(), numTerms);

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