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 2018/02/23 21:39:00 UTC

[jira] [Created] (SYSTEMML-2161) Suboptimal codegen plans for ALS due to wrong cost model memoization

Matthias Boehm created SYSTEMML-2161:
----------------------------------------

             Summary: Suboptimal codegen plans for ALS due to wrong cost model memoization
                 Key: SYSTEMML-2161
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2161
             Project: SystemML
          Issue Type: Bug
            Reporter: Matthias Boehm


Due to a change from 1 to 0-based ID sequences in SystemML, there is a codegen cost model memoization issue for special cases of the first cost vector per optimization problem. For ALS-CG over amazon this has severe performance implications causing a slowdown of more than 2x.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)