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Posted to issues@systemml.apache.org by "Matthias Boehm (JIRA)" <ji...@apache.org> on 2017/10/11 21:30:00 UTC

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

Matthias Boehm created SYSTEMML-1956:
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             Summary: 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


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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