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https://issues.apache.org/jira/browse/MAHOUT-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13724942#comment-13724942
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Hudson commented on MAHOUT-1298:
--------------------------------
SUCCESS: Integrated in Mahout-Quality #2176 (See
[https://builds.apache.org/job/Mahout-Quality/2176/])
MAHOUT-1298: SparseRowMatrix,SparseColMatrix: optimize transpose()
Squashed commit of the following:
commit 809fa0105897113e44f7e55af611ed61d1746cb8
Merge: 9f963f8 21486b9
Author: Dmitriy Lyubimov <[email protected]>
Date: Tue Jul 30 22:51:53 2013 -0700
Merge branch 'trunk' into MAHOUT-1298
commit 9f963f83b942c2bccade9dfd860ef2ff19687bbc
Author: Dmitriy Lyubimov <[email protected]>
Date: Mon Jul 29 16:53:12 2013 -0700
Reverting whatever changes to SparseRowMatrixTest
commit 69e8c7655939ad3fe3072422b70e6fccfd6ce946
Author: Dmitriy Lyubimov <[email protected]>
Date: Mon Jul 29 16:47:13 2013 -0700
implementation; specific tests are not required (already implemented in
abstract matrix test) (dlyubimov: rev 1508733)
*
/mahout/trunk/math/src/main/java/org/apache/mahout/math/SparseColumnMatrix.java
* /mahout/trunk/math/src/main/java/org/apache/mahout/math/SparseRowMatrix.java
> SparseRowMatrix,SparseColMatrix: optimize transpose()
> -----------------------------------------------------
>
> Key: MAHOUT-1298
> URL: https://issues.apache.org/jira/browse/MAHOUT-1298
> Project: Mahout
> Issue Type: New Feature
> Components: Math
> Affects Versions: 0.8
> Reporter: Dmitriy Lyubimov
> Assignee: Dmitriy Lyubimov
> Fix For: 0.9
>
> Attachments: MAHOUT-1298.path
>
>
> these matrices lack optimized transpose and rely onto AbstractMatrix's O(mn)
> implementation which is not cool for very sparse subblocks.
> proposal is to implement a custom transpose with two things in mind:
> 1) transpose result to row sparse matrix should be col sparse matrix, and
> vice versa (and not from default like() as default implementation would take);
> 2) obviously, iterate only thru non-zero elements only of all rows(columns).
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