[jira] [Work started] (MAHOUT-1313) RowSimilarityJob, sampleDown method problem

["Stevo Slavic (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-1313?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on MAHOUT-1313 started by Stevo Slavic.

> 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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