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From "Suneel Marthi (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAHOUT-1781) Dense matrix view multiplication is 4x slower than non-view one
Date Sun, 25 Oct 2015 21:31:27 GMT

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

Suneel Marthi updated MAHOUT-1781:
----------------------------------
    Fix Version/s:     (was: 0.11.1)
                   0.13.0
                   0.12.0

> 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
>             Fix For: 0.12.0, 0.13.0
>
>
> 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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