[jira] [Assigned] (MAHOUT-797) MapReduce SSVD: provide alternative B-pipeline per B=R' ^{-1} Y'A

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

     [ https://issues.apache.org/jira/browse/MAHOUT-797?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dmitriy Lyubimov reassigned MAHOUT-797:
---------------------------------------

    Assignee: Dmitriy Lyubimov

> MapReduce SSVD: provide alternative B-pipeline per B=R' ^{-1} Y'A
> -----------------------------------------------------------------
>
>                 Key: MAHOUT-797
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-797
>             Project: Mahout
>          Issue Type: Improvement
>            Reporter: Dmitriy Lyubimov
>            Assignee: Dmitriy Lyubimov
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> Since alternative flow using Cholesky decomposition is extremely easy to add to existing computations of BB', I am thinking of just adding an option that chooses between B-pipeline with QR step and B-pipeline with Y'Y-Cholesky step. 
> Ongoing work and some initial code (Y'Y step) is here https://github.com/dlyubimov/mahout-commits/tree/MAHOUT-797.
> I also want to fix what's left unfixed in MAHOUT-638.

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