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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