Matthias Boehm created SYSTEMML-1954:
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Summary: Allocate rexpand output in CSR instead of MCSR
Key: SYSTEMML-1954
URL: https://issues.apache.org/jira/browse/SYSTEMML-1954
Project: SystemML
Issue Type: Sub-task
Reporter: Matthias Boehm
By default, we use the MCSR sparse format due to its flexibility on incremental
updates. However, for permutation tables often created via {{rexpand}} (i.e.,
via table(seq,v)), we have exactly one non-zero per row which is the worst-case
in terms of memory overhead. Since, we already have the abstract for different
sparse representations, we should create CSR outputs for operations that are
known to produce ultra sparse matrices.
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