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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SYSTEMML-2161) Suboptimal codegen plans for ALS due to wrong cost model memoization
Date Fri, 23 Feb 2018 21:39:00 GMT
Matthias Boehm created SYSTEMML-2161:
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             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.



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