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From "Dmitriy Lyubimov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAHOUT-1730) new mutable transposition view for in-core matrices.
Date Wed, 17 Jun 2015 19:00:01 GMT

     [ https://issues.apache.org/jira/browse/MAHOUT-1730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dmitriy Lyubimov updated MAHOUT-1730:
-------------------------------------
    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

> new mutable transposition view for in-core matrices.
> ----------------------------------------------------
>
>                 Key: MAHOUT-1730
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1730
>             Project: Mahout
>          Issue Type: Improvement
>            Reporter: Dmitriy Lyubimov
>            Assignee: Dmitriy Lyubimov
>             Fix For: 0.10.2
>
>
> in-core mxA.t rewrite with mostly two goals in mind: 
> (1) enable mutability , e.g. 
> for (col <- mxA.t) col := k
> (2) translate matrix structural flavor for optimizers correctly. i.e. new SparseRowMatrix.t
 carries on as column-major structure.
> Also it does unwrapping automatically, i.e. mxA.t.t eq mxA is true.
> there are other smaller goals hit in this rewrite, e.g. various efficient assigns. 
> PR https://github.com/apache/mahout/pull/135



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