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https://issues.apache.org/jira/browse/MAHOUT-1781?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Suneel Marthi resolved MAHOUT-1781.
-----------------------------------
Resolution: Fixed
Fix Version/s: (was: 0.13.0)
> 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
>
>
> 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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