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Posted to issues@systemml.apache.org by "Matthias Boehm (JIRA)" <ji...@apache.org> on 2017/10/14 06:22:00 UTC

[jira] [Closed] (SYSTEMML-1956) Performance sparse reshape w/o unnecessary reallocations

     [ https://issues.apache.org/jira/browse/SYSTEMML-1956?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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