You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@systemml.apache.org by "Matthias Boehm (JIRA)" <ji...@apache.org> on 2017/10/11 18:46:00 UTC

[jira] [Created] (SYSTEMML-1954) Allocate rexpand output in CSR instead of MCSR

Matthias Boehm created SYSTEMML-1954:
----------------------------------------

             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.



--
This message was sent by Atlassian JIRA
(v6.4.14#64029)