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https://issues.apache.org/jira/browse/SYSTEMML-1956?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-1956.
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> Performance sparse reshape w/o unnecessary reallocations
> --------------------------------------------------------
>
> Key: SYSTEMML-1956
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1956
> Project: SystemML
> Issue Type: Sub-task
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Fix For: SystemML 1.0
>
>
> Often reshape operations convert from n1 to n1*n2 columns. In this special
> case where we have a N:1 mapping of input to output rows, we should determine
> the number of nnz per output row exactly and allocate it once in order to
> reduce unnecessary garbage collection overhead.
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