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Posted to dev@mahout.apache.org by "Dmitriy Lyubimov (JIRA)" <ji...@apache.org> on 2015/10/25 21:28:27 UTC

[jira] [Updated] (MAHOUT-1781) Dense matrix view multiplication is 4x slower than non-view one

     [ https://issues.apache.org/jira/browse/MAHOUT-1781?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dmitriy Lyubimov updated MAHOUT-1781:
-------------------------------------
    Sprint: Nov/Dec-2015

> Dense matrix view multiplication is 4x slower than non-view one
> ---------------------------------------------------------------
>
>                 Key: MAHOUT-1781
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1781
>             Project: Mahout
>          Issue Type: Improvement
>    Affects Versions: 0.11.0
>            Reporter: Dmitriy Lyubimov
>            Assignee: Dmitriy Lyubimov
>            Priority: Critical
>
> if mxA and mxB are two in-core DenseMatrix matrices, then 
> mxA(::,::) %*% mxB(::,::) takes 4x the time of mxA %*% mxB.
> possibly an issue of dot products on VectorViews vs. DenseVectors.
> dot product over DenseVectors seems to not to go through aggregate() cost-optimized framework. 



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