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https://issues.apache.org/jira/browse/SYSTEMML-1955?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm resolved SYSTEMML-1955.
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Resolution: Done
Assignee: Matthias Boehm
Fix Version/s: SystemML 1.0
> 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
> Assignee: Matthias Boehm
> Fix For: SystemML 1.0
>
>
> 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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