[jira] [Updated] (MAHOUT-772) Refactor Matrix/Vector implementation with linear operators

["Sebastian Schelter (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-772?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sebastian Schelter updated MAHOUT-772:
--------------------------------------

    Fix Version/s:     (was: 0.8)
                   Backlog
    
> Refactor Matrix/Vector implementation with linear operators
> -----------------------------------------------------------
>
>                 Key: MAHOUT-772
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-772
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Math
>    Affects Versions: 0.5
>            Reporter: Jonathan Traupman
>             Fix For: Backlog
>
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> As part of the implementation of MAHOUT-672, we refactored the various linear algebra classes to include a new superclass for matrices, the LinearOperator, which is more or less a matrix that implements various arithmetic operations but does not allow per-element or per-row/col access. Linear operators allowed us to implement things like diagonal offsets (e.g. ridge regression) and the "timesSquared" operation efficiently and generally, removing some special-case code in various algorithms. 
> Since in its current state, this refactor isn't ready for inclusion, and because it's fairly separate for other stuff in MAHOUT-672, I'm pulling it out into its own issue.

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