Janardhan reassigned SYSTEMML-2161:

    Assignee: Matthias Boehm

> 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
>            Assignee: Matthias Boehm
>            Priority: Major
> 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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