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From "Dmitriy Lyubimov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAHOUT-376) Implement Map-reduce version of stochastic SVD
Date Thu, 02 Dec 2010 02:01:11 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12965963#action_12965963
] 

Dmitriy Lyubimov commented on MAHOUT-376:
-----------------------------------------

Although can one really implement a streaming read of a value for a mapper value? I am not
sure. i guess i need to look at implementation of sparse sequential vector. It would seem
to me though that sequenceFile.next() requires deserialization of the whole record, doesn't
it? so reading mapper value in a streaming fashion should not be possible, not without some
sort of a hack, right? 

> 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-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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