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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SYSTEMML-1956) Performance sparse reshape w/o unnecessary reallocations
Date Sat, 14 Oct 2017 06:22:00 GMT

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

Matthias Boehm resolved SYSTEMML-1956.
--------------------------------------
       Resolution: Done
         Assignee: Matthias Boehm
    Fix Version/s: SystemML 1.0

> 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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