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https://issues.apache.org/jira/browse/MAHOUT-1729?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitriy Lyubimov resolved MAHOUT-1729.
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Resolution: Fixed
> Straighten out behavior of Matrix.iterator() and iterateNonEmpty()
> ------------------------------------------------------------------
>
> Key: MAHOUT-1729
> URL: https://issues.apache.org/jira/browse/MAHOUT-1729
> Project: Mahout
> Issue Type: Bug
> Reporter: Dmitriy Lyubimov
> Assignee: Dmitriy Lyubimov
> Fix For: 0.10.2
>
>
> SparseMatrix in particular does iterateNonEmpty() instead of iterating over
> all rows in default iterator. This creates contract inconsistency leading to
> computational errors.
> so... this fixes to guarantee that
> for (row <- mxA)
> visits ALL rows in the mxA (even if they are totally empty).
> If it is ok not to process completely 0ed rows, then the following form
> should be used:
> for (row <- mxA.iterateNonEmpty) ...
> PR https://github.com/apache/mahout/pull/135
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