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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 Fri, 03 Dec 2010 16:47:11 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12966576#action_12966576
] 

Dmitriy Lyubimov edited comment on MAHOUT-376 at 12/3/10 11:45 AM:
-------------------------------------------------------------------

Patch update

* eliminates use of combiners. Combiner's code moved back to mapper of the same task. This
makes first stage of hierarchical R merges more efficient and consistent with MR spec.

Retested with 100k rows matrix.I will be updating working notes to reflect the change shortly.

      was (Author: dlyubimov2):
    Patch update

* eliminates use of combiners. Combiner's code moved back to mapper of the same task. This
make first stage of hierarchical R merges both efficient and consistent with MR spec.

Retested with 100k matrix.I will be updating working notes to reflect the change shortly.
  
> 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, Modified stochastic svd algorithm for mapreduce.pdf,
QR decomposition for Map.pdf, QR decomposition for Map.pdf, QR decomposition for Map.pdf,
sd-bib.bib, sd.pdf, sd.pdf, sd.pdf, sd.pdf, sd.tex, sd.tex, sd.tex, sd.tex, SSVD working notes.pdf,
SSVD working notes.pdf, SSVD working notes.pdf, ssvd-CDH3-or-0.21.patch.gz, ssvd-CDH3-or-0.21.patch.gz,
ssvd-CDH3-or-0.21.patch.gz, ssvd-m1.patch.gz, ssvd-m2.patch.gz, ssvd-m3.patch.gz, Stochastic
SVD using eigensolver trick.pdf
>
>
> See attached pdf for outline of proposed method.
> All comments are welcome.

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