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https://issues.apache.org/jira/browse/MAHOUT-923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13167291#comment-13167291
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Raphael Cendrillon commented on MAHOUT-923:
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It might be worthwhile to pull this into a seperate issue. 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.
Does a class like this already exist?
> 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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