Matthias Boehm created SYSTEMML-2054:
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Summary: Performance features sparse-sparse leftindexing
Key: SYSTEMML-2054
URL: https://issues.apache.org/jira/browse/SYSTEMML-2054
Project: SystemML
Issue Type: Task
Reporter: Matthias Boehm
This task aims to improve the sparse-sparse left indexing performance, which
includes:
* Shallow copy of sparse rows into empty target rows (0 aligned)
* Exact preallocation of sparse rows for coping rows into empty target rows
(not 0 aligned)
* New set index range with input sparse row to avoid repeated binary search and
shifting.
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