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https://issues.apache.org/jira/browse/MAHOUT-923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13169868#comment-13169868
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jirapos...@reviews.apache.org commented on MAHOUT-923:
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Looks much better from the trivial formatting standpoint.
- Ted
On 2011-12-13 17:53:35, Raphael Cendrillon wrote:
bq.
bq. -----------------------------------------------------------
bq. This is an automatically generated e-mail. To reply, visit:
bq. https://reviews.apache.org/r/3147/
bq. -----------------------------------------------------------
bq.
bq. (Updated 2011-12-13 17:53:35)
bq.
bq.
bq. Review request for mahout, lancenorskog and Dmitriy Lyubimov.
bq.
bq.
bq. Summary
bq. -------
bq.
bq. 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.
bq.
bq.
bq. This addresses bug MAHOUT-923.
bq. https://issues.apache.org/jira/browse/MAHOUT-923
bq.
bq.
bq. Diffs
bq. -----
bq.
bq.
/trunk/core/src/test/java/org/apache/mahout/math/hadoop/TestDistributedRowMatrix.java
1213474
bq.
/trunk/core/src/main/java/org/apache/mahout/math/hadoop/MatrixColumnMeansJob.java
PRE-CREATION
bq.
/trunk/core/src/main/java/org/apache/mahout/math/hadoop/DistributedRowMatrix.java
1213474
bq.
bq. Diff: https://reviews.apache.org/r/3147/diff
bq.
bq.
bq. Testing
bq. -------
bq.
bq. Junit test
bq.
bq.
bq. Thanks,
bq.
bq. Raphael
bq.
bq.
> 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, 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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