[jira] [Commented] (MAHOUT-1300) Support for easy functional matrix views and some of their derivatives

["Dmitriy Lyubimov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAHOUT-1300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13724328#comment-13724328 ] 

Dmitriy Lyubimov commented on MAHOUT-1300:
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One thing i am not sure about is that we seem to have practice of using RandomGenerator from apache commons although this does not consistently apply to murmur utils. So fixing seed for tests does not seem to be consistent.

                
> Support for easy functional matrix views and some of their derivatives
> ----------------------------------------------------------------------
>
>                 Key: MAHOUT-1300
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1300
>             Project: Mahout
>          Issue Type: Improvement
>    Affects Versions: 0.8
>            Reporter: Dmitriy Lyubimov
>            Assignee: Dmitriy Lyubimov
>             Fix For: 0.9
>
>         Attachments: MAHOUT-1300.patch
>
>
> Support for easy matrix views based on (Int,Int)=>Double function. 
> Current derived views: 
> (1) general functional view
> (2) transposed matrix view
> (3) uniform matrix view (based on function composition over symmetric uniform)
> (4) symmetric uniform matrix view (based on murmur64)
> (5) random gaussian matrix view.
> I know that there's a trinary random matrix as well which could be scripted out as a view as well (methinks), as well as Omega thing in distributed SSVD which also perhaps could be replaced by a symmetric uniform view.

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