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

] commented on MAHOUT-923:

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(Updated 2011-12-13 17:53:35.691333)

Review request for mahout, lancenorskog and Dmitriy Lyubimov.


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


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.

Diffs (updated)

  /trunk/core/src/test/java/org/apache/mahout/math/hadoop/ 1213474

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

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



Junit test



> Row mean job for PCA
> --------------------
>                 Key: MAHOUT-923
>                 URL:
>             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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