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From "Sean Owen (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SPARK-5766) Slow RowMatrix multiplication
Date Sat, 09 Jan 2016 12:49:39 GMT

     [ https://issues.apache.org/jira/browse/SPARK-5766?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sean Owen resolved SPARK-5766.
------------------------------
    Resolution: Not A Problem

Or to some degree this is already done via netlib

> Slow RowMatrix multiplication
> -----------------------------
>
>                 Key: SPARK-5766
>                 URL: https://issues.apache.org/jira/browse/SPARK-5766
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>            Reporter: Amaru Cuba Gyllensten
>            Priority: Minor
>              Labels: matrix
>
> Looking at the source code for RowMatrix multiplication by a local matrix, it seems like
it is going through all columnvectors of the matrix, doing pairwise dot product on each column.
 
> It seems like this could be sped up by using gemm, performing full matrix-matrix multiplication
on the local data, (or gemv, for vector-matrix multiplication), as is done in BlockMatrix
or Matrix.



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