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https://issues.apache.org/jira/browse/MAHOUT-1574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14020670#comment-14020670
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Hudson commented on MAHOUT-1574:
--------------------------------
FAILURE: Integrated in Mahout-Quality #2637 (See
[https://builds.apache.org/job/Mahout-Quality/2637/])
MAHOUT-1574 - Add sparse handling to rows and columns of DiagonalMatrix
(tdunning: rev dd78ed9479559cd222f24fa0be57655cf2e3075b)
* math/src/main/java/org/apache/mahout/math/DiagonalMatrix.java
* math/src/test/java/org/apache/mahout/math/DiagonalMatrixTest.java
MAHOUT-1574 - Make SparseRowMatrix handle multiplication efficiently for
special cases of SRM, DenseMatrix and other kinds of sparse matrices. Speedup
on the given test is at least several thousand x (tdunning: rev
0f4f5dec7f3a7de7161d1fabf3e02418099f4446)
* math/src/main/java/org/apache/mahout/math/SparseRowMatrix.java
MAHOUT-1574 - Add tests to demonstrate correctness and efficiency (tdunning:
rev 5083f58359dd103ac6d8e72a50c53bb20a5df14e)
* math/src/test/java/org/apache/mahout/math/TestSparseRowMatrix.java
> SparseRowMatrix needs performance improvement for times()
> ---------------------------------------------------------
>
> Key: MAHOUT-1574
> URL: https://issues.apache.org/jira/browse/MAHOUT-1574
> Project: Mahout
> Issue Type: Bug
> Reporter: Ted Dunning
>
> According to ssc,
> > * SparseRowMatrix with sequential vectors times SparseRowMatrix with
> > sequential vectors is totally broken, it uses three nested loops and uses
> > get(row, col) on the matrices, which internally uses binary search...
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