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https://issues.apache.org/jira/browse/MAHOUT-1571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14018238#comment-14018238
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ASF GitHub Bot commented on MAHOUT-1571:
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Github user dlyubimov commented on the pull request:
https://github.com/apache/mahout/pull/9#issuecomment-45156215
FunctionalView matrix introduced general concept of dense/sparse matrix.
surprisingly, abstract matrix has none. So MatrixWritable just tries to look at
a row view to figure this out. Perhaps the isDense functionality should be
added to AbstractMatrix in the first place?
> Functional Views are not serialized as dense/sparse correctly
> -------------------------------------------------------------
>
> Key: MAHOUT-1571
> URL: https://issues.apache.org/jira/browse/MAHOUT-1571
> Project: Mahout
> Issue Type: Bug
> Affects Versions: 0.9
> Reporter: Dmitriy Lyubimov
> Assignee: Dmitriy Lyubimov
> Fix For: 1.0
>
>
> per [~ssc]
> - all entries of a TransposeView (and possibly other views) of a sparse
> matrix are serialized, resulting in OOM
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