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https://issues.apache.org/jira/browse/MAHOUT-923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13167341#comment-13167341
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Raphael Cendrillon commented on MAHOUT-923:
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Thanks Lance. A combiner is definitely the next step. One question, is there
already a writable for tuples of e.g. int and Vector, or should I just write
one from scratch? I know there is TupleWritable, but from what I've read online
it's better to avoid that unless you're doing a multiple input join.
Regarding the class for the output vector, are you saying that instead of
inhereting the class from the rows of the DistributedRowMatrix you'd rather be
able to specify this manually?
> 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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