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Posted to dev@mahout.apache.org by "Ted Dunning (JIRA)" <ji...@apache.org> on 2014/06/07 07:10:01 UTC

[jira] [Reopened] (MAHOUT-1574) SparseRowMatrix needs performance improvement for times()

     [ https://issues.apache.org/jira/browse/MAHOUT-1574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ted Dunning reopened MAHOUT-1574:
---------------------------------

      Assignee: Ted Dunning

Oops.  Regressed with new code in terms of matrix size checking.

> SparseRowMatrix needs performance improvement for times()
> ---------------------------------------------------------
>
>                 Key: MAHOUT-1574
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1574
>             Project: Mahout
>          Issue Type: Bug
>            Reporter: Ted Dunning
>            Assignee: Ted Dunning
>
> According to ssc,
> > * SparseRowMatrix with sequential vectors times SparseRowMatrix with
> > sequential vectors is totally broken, it uses three nested loops and uses
> > get(row, col) on the matrices, which internally uses binary search...



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