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https://issues.apache.org/jira/browse/MAHOUT-1580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14036386#comment-14036386
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Hudson commented on MAHOUT-1580:
--------------------------------
SUCCESS: Integrated in Mahout-Quality #2664 (See
[https://builds.apache.org/job/Mahout-Quality/2664/])
MAHOUT-1580 Optimize getNumNonZeroElements() closes apache/mahout#17 (ssc: rev
45d88031c8e782a624eaf6cefea9700600805647)
* CHANGELOG
* math/src/main/java/org/apache/mahout/math/SequentialAccessSparseVector.java
* math/src/test/java/org/apache/mahout/math/VectorTest.java
* math/src/main/java/org/apache/mahout/math/DenseVector.java
* math/src/main/java/org/apache/mahout/math/RandomAccessSparseVector.java
* math/src/main/java/org/apache/mahout/math/PermutedVectorView.java
> Optimize getNumNonZeroElements
> ------------------------------
>
> Key: MAHOUT-1580
> URL: https://issues.apache.org/jira/browse/MAHOUT-1580
> Project: Mahout
> Issue Type: Improvement
> Components: Math
> Reporter: Sebastian Schelter
> Assignee: Sebastian Schelter
> Fix For: 1.0
>
>
> getNumNonZeroElements in AbstractVector uses the nonZeroes -iterator
> internally which adds a lot of overhead for certain types of vectors, e.g.
> the dense ones. We should add custom implementations here.
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