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Posted to dev@mahout.apache.org by "Maysam Yabandeh (JIRA)" <ji...@apache.org> on 2013/06/03 12:46:21 UTC

[jira] [Created] (MAHOUT-1238) VectorWritable's bug with VectorView of sparse vectors

Maysam Yabandeh created MAHOUT-1238:
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             Summary: VectorWritable's bug with VectorView of sparse vectors
                 Key: MAHOUT-1238
                 URL: https://issues.apache.org/jira/browse/MAHOUT-1238
             Project: Mahout
          Issue Type: Bug
          Components: Math
    Affects Versions: 0.7, 0.8
            Reporter: Maysam Yabandeh
             Fix For: 0.8, 0.7


VectorWritable raises an exception if it is used on a VectorView of a sparse vector. The reason is that the sparse vector writes only the non-zero elements, while VectorView's implementation of getNumNondefaultElements() returns the size of the entire data. Later when reading the vector, VectorWritable expects reading more items that was written.

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