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Posted to dev@mahout.apache.org by "sam wu (JIRA)" <ji...@apache.org> on 2013/08/13 21:18:50 UTC

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

sam wu created MAHOUT-1313:
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             Summary: 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: 0.9
            Reporter: sam wu
            Assignee: Sean Owen
            Priority: Minor


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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