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https://issues.apache.org/jira/browse/MAHOUT-1580?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sebastian Schelter resolved MAHOUT-1580.
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Resolution: Fixed
> 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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