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https://issues.apache.org/jira/browse/MAHOUT-1723?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Suneel Marthi closed MAHOUT-1723.
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> Optional structural "flavor" abstraction for in-core matrices.
> --------------------------------------------------------------
>
> Key: MAHOUT-1723
> URL: https://issues.apache.org/jira/browse/MAHOUT-1723
> Project: Mahout
> Issue Type: Improvement
> Reporter: Dmitriy Lyubimov
> Assignee: Dmitriy Lyubimov
> Fix For: 0.10.2
>
>
> This is structural abstraction (which is optional for a matrix but
> implemented for most we use) that allows to interrogate matrix operands
> whether they are dense or sparse, row or column-major or diagonal etc.
> without coding to a concrete matrix implementation class.
> this allows to build structure-optimized iterations.
> PR https://github.com/apache/mahout/pull/135
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