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https://issues.apache.org/jira/browse/MAHOUT-44?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12590763#action_12590763
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Grant Ingersoll commented on MAHOUT-44:
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Just for completeness, can you add Unit tests?
> Override zSum and dot for SparseVector
> --------------------------------------
>
> Key: MAHOUT-44
> URL: https://issues.apache.org/jira/browse/MAHOUT-44
> Project: Mahout
> Issue Type: Improvement
> Components: Matrix
> Affects Versions: 0.1
> Reporter: julien nioche
> Assignee: Grant Ingersoll
> Priority: Minor
> Fix For: 0.1
>
> Attachments: SparseVector.diff
>
>
> revision 649163
> The patch attached overrides the zSum() and dot() methods in SparseVector.
> This is more efficient than relying on the methods from AbstractVector which
> iterate on all the indices of the Vectors.
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