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https://issues.apache.org/jira/browse/MAHOUT-923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13167293#comment-13167293
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jirapos...@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 2011-12-12 00:30:24.091994)
Review request for mahout.
Summary
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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/main/java/org/apache/mahout/math/hadoop/DistributedRowMatrix.java
1213095
/trunk/core/src/main/java/org/apache/mahout/math/hadoop/MatrixRowMeanJob.java
PRE-CREATION
/trunk/core/src/test/java/org/apache/mahout/math/hadoop/TestDistributedRowMatrix.java
1213095
Diff: https://reviews.apache.org/r/3147/diff
Testing
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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
>
>
> Add map reduce job for calculating mean row (column-wise mean) of a
> Distributed Row Matrix for use in PCA.
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