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From "jiraposter@reviews.apache.org (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-923) Row mean job for PCA
Date Tue, 13 Dec 2011 17:54:32 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13168543#comment-13168543
] 

jiraposter@reviews.apache.org commented on MAHOUT-923:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/3147/
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(Updated 2011-12-13 17:53:35.691333)


Review request for mahout, lancenorskog and Dmitriy Lyubimov.


Changes
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Changed method name to columnMeans(). Removed trailing whitespaces.


Summary
-------

Here's a patch with a simple job to calculate the row mean (column-wise mean). One outstanding
issue is the combiner, this requires a wrtiable class IntVectorTupleWritable, where the Int
stores the number of rows, and the Vector stores the column-wise sum.


This addresses bug MAHOUT-923.
    https://issues.apache.org/jira/browse/MAHOUT-923


Diffs (updated)
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  /trunk/core/src/test/java/org/apache/mahout/math/hadoop/TestDistributedRowMatrix.java 1213474

  /trunk/core/src/main/java/org/apache/mahout/math/hadoop/MatrixColumnMeansJob.java PRE-CREATION

  /trunk/core/src/main/java/org/apache/mahout/math/hadoop/DistributedRowMatrix.java 1213474


Diff: https://reviews.apache.org/r/3147/diff


Testing
-------

Junit test


Thanks,

Raphael


                
> Row mean job for PCA
> --------------------
>
>                 Key: MAHOUT-923
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-923
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Math
>    Affects Versions: 0.6
>            Reporter: Raphael Cendrillon
>            Assignee: Raphael Cendrillon
>             Fix For: Backlog
>
>         Attachments: MAHOUT-923.patch, MAHOUT-923.patch
>
>
> Add map reduce job for calculating mean row (column-wise mean) of a Distributed Row Matrix
for use in PCA.

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