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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-1313) RowSimilarityJob, sampleDown method problem
Date Tue, 13 Aug 2013 21:02:48 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-1313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13738823#comment-13738823
] 

Hudson commented on MAHOUT-1313:
--------------------------------

SUCCESS: Integrated in Mahout-Quality #2195 (See [https://builds.apache.org/job/Mahout-Quality/2195/])
MAHOUT-1313: Fixed unwanted integral division bug in RowSimilarityJob downsampling code where
precision should have been retained (sslavic: rev 1513632)
* /mahout/trunk/CHANGELOG
* /mahout/trunk/core/src/main/java/org/apache/mahout/math/hadoop/similarity/cooccurrence/RowSimilarityJob.java

                
> RowSimilarityJob, sampleDown method problem
> -------------------------------------------
>
>                 Key: MAHOUT-1313
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1313
>             Project: Mahout
>          Issue Type: Bug
>          Components: Collaborative Filtering
>    Affects Versions: 0.8
>            Reporter: sam wu
>            Assignee: Stevo Slavic
>            Priority: Minor
>             Fix For: 0.9
>
>
> RowSimilarityJob.java , sampleDown method 
> ----line 291 or 300
>  double rowSampleRate = Math.min(maxObservationsPerRow, observationsPerRow) / observationsPerRow;
> currently always return either 0.0 or 1.0.
> Should return true double, eg: 0.34,... 

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