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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SYSTEMML-1547) Cache-conscious post processing tsmm
Date Wed, 19 Apr 2017 22:57:04 GMT
Matthias Boehm created SYSTEMML-1547:
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             Summary: Cache-conscious post processing tsmm
                 Key: SYSTEMML-1547
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1547
             Project: SystemML
          Issue Type: Task
            Reporter: Matthias Boehm


For scenarios like tsmm outer products t(X) %*% X, where X is a row vector, the post-processing
in terms of (1) copying the upper to lower triangle, and (2) nnz recomputation significantly
contribute to the execution time.

This task aims at a cache-conscious copy of upper to lower triangles similar to dense-dense
transpose as well as fusing the nnz recompuation into either the computation or copy operation.



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