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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SYSTEMML-1955) Ultra-sparse matrix multiply for large ultra-sparse matrices
Date Wed, 11 Oct 2017 18:48:00 GMT
Matthias Boehm created SYSTEMML-1955:
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             Summary: Ultra-sparse matrix multiply for large ultra-sparse matrices
                 Key: SYSTEMML-1955
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1955
             Project: SystemML
          Issue Type: Sub-task
            Reporter: Matthias Boehm


Our code path for ultra-sparse matrix multiplies has a condition on the sparsity but also
the absolute number of non-zeros in order to avoid unnecessary overhead in CP where the entire
matrix is a single block. However, there are use cases, where this approach leads to large
allocated dense outputs although the output is sparse as well.



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