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Posted to dev@mahout.apache.org by "Robin Anil (JIRA)" <ji...@apache.org> on 2013/06/03 15:43:20 UTC

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

    [ https://issues.apache.org/jira/browse/MAHOUT-1238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13673108#comment-13673108 ] 

Robin Anil commented on MAHOUT-1238:
------------------------------------

There is a getNumNonZeroElements() method in AbstractVector try using that.
                
> 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
>            Assignee: Robin Anil
>              Labels: reduce, test
>             Fix For: 0.7, 0.8
>
>         Attachments: MAHOUT-1238.patch
>
>
> 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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