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https://issues.apache.org/jira/browse/SYSTEMML-471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-471.
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> COO sparse matrix block
> -----------------------
>
> Key: SYSTEMML-471
> URL: https://issues.apache.org/jira/browse/SYSTEMML-471
> Project: SystemML
> Issue Type: Task
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Fix For: SystemML 0.10
>
>
> Given the new sparse matrix block abstraction defined in [SYSTEMML-378], it
> would be nice to support the COO sparse matrix format for ultra-sparse
> matrices as well. CSR is memory-efficient for sparse matrices but incurs
> unnecessary overhead for ultra-sparse matrices. For example, consider a 1k x
> 1k matrix with a sparsity of (10^-5), i.e, 10 non-zero values. CSR would
> require roughly 1k*4B+10*12B = 4120B, while COO would require only 10*16B =
> 160B.
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