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Posted to dev@mahout.apache.org by "Jarosław Bojar (JIRA)" <ji...@apache.org> on 2014/05/24 01:48:03 UTC

[jira] [Created] (MAHOUT-1560) Last batch is not filled correctly in MultithreadedBatchItemSimilarities

Jarosław Bojar created MAHOUT-1560:
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             Summary: Last batch is not filled correctly in MultithreadedBatchItemSimilarities
                 Key: MAHOUT-1560
                 URL: https://issues.apache.org/jira/browse/MAHOUT-1560
             Project: Mahout
          Issue Type: Bug
          Components: Collaborative Filtering
    Affects Versions: 0.9
            Reporter: Jarosław Bojar
            Priority: Minor


In {{MultithreadedBatchItemSimilarities}} method {{queueItemIDsInBatches}} handles last batch incorrectly. Last batch length is calculated incorrectly. As a result last batch is either truncated or too long with superfluous positions filled with item indexes from previous batch.

Attached test fails for very short model (with only 4 items) with NoSuchItemException.

Attached patch corrects this issue.



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