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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-1508) Performance problems with sparse matrices
Date Sat, 12 Apr 2014 12:53:15 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-1508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13967494#comment-13967494
] 

Hudson commented on MAHOUT-1508:
--------------------------------

SUCCESS: Integrated in Mahout-Quality #2563 (See [https://builds.apache.org/job/Mahout-Quality/2563/])
MAHOUT-1508: Performance problems with sparse matrices (ssc: rev 1586851)
* /mahout/trunk/CHANGELOG
* /mahout/trunk/core/src/main/java/org/apache/mahout/math/MatrixWritable.java
* /mahout/trunk/core/src/test/java/org/apache/mahout/math/MatrixWritableTest.java
* /mahout/trunk/math/src/main/java/org/apache/mahout/math/RandomAccessSparseVector.java
* /mahout/trunk/math/src/main/java/org/apache/mahout/math/SequentialAccessSparseVector.java
* /mahout/trunk/math/src/main/java/org/apache/mahout/math/SparseMatrix.java
* /mahout/trunk/math/src/test/java/org/apache/mahout/math/TestSparseMatrix.java


> Performance problems with sparse matrices
> -----------------------------------------
>
>                 Key: MAHOUT-1508
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1508
>             Project: Mahout
>          Issue Type: Bug
>          Components: Math
>            Reporter: Sebastian Schelter
>            Assignee: Sebastian Schelter
>            Priority: Blocker
>             Fix For: 1.0
>
>
> I'm currently working with the new Scala DSL and running into a problem with SparseMatrix
and SparseRowMatrix.
> The problem is that they don't implement a specialized assign(Matrix other, DoubleDoubleFunction
f) function, but use the implementation from AbstractMatrix which loops through all (!) possible
entries. 
> We have to fix this asap.



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