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From "Dmitriy Lyubimov (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (MAHOUT-376) Implement Map-reduce version of stochastic SVD
Date Sun, 10 Oct 2010 05:09:30 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12919567#action_12919567
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Dmitriy Lyubimov edited comment on MAHOUT-376 at 10/10/10 1:08 AM:
-------------------------------------------------------------------

ok, i got to BBt normalized for rank deficiences in Q blocks. 

What eigensolver should i use in context of Mahout? I know there's something in that Cern
library but it is all deprecateed. There's also a solver in apache commons, but it is not
readily imported into the mahout core.

Thanks.

PS. i tried EigenvalueDecomposition from cern library. I know i am quite likely providing
an ill-conditioned matrix in my unit test but strange thing is that eigen values are not always
in descending order. i thought they were supposed to come out in descending order?

      was (Author: dlyubimov2):
    ok, i got to BBt normalized for rank deficiences in Q blocks. 

What eigensolver should i use in context of Mahout? I know there's something in that Cern
library but it is all deprecateed. There's also a solver in apache commons, but it is not
readily imported into the mahout core.

Thanks.
  
> Implement Map-reduce version of stochastic SVD
> ----------------------------------------------
>
>                 Key: MAHOUT-376
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-376
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Math
>            Reporter: Ted Dunning
>            Assignee: Ted Dunning
>             Fix For: 0.5
>
>         Attachments: MAHOUT-376.patch, sd-bib.bib, sd.pdf, sd.tex, Stochastic SVD using
eigensolver trick.pdf
>
>
> See attached pdf for outline of proposed method.
> All comments are welcome.

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