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https://issues.apache.org/jira/browse/MAHOUT-923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13167337#comment-13167337
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Lance Norskog commented on MAHOUT-923:
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MatrixRowMeanJob writes <NullWritable,VectorWritable> but the convention for
Mahout jobs is <IntWritable,VectorWritable>. Should it use an IntWritable
instead for consistency? The Int would be one.
Can MatrixRowMeanJob have a Combiner? Would this help with performance in the
standard use cases? The key would still be NullWritable. value would be a
VectorWritable and a counter. The Reducer would include the counters for each
input Vector.
Should MatrixRowMeanJob have a configurable class for the ouput vector?
> 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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