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https://issues.apache.org/jira/browse/SYSTEMML-2161?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Janardhan resolved SYSTEMML-2161.
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Resolution: Fixed
Fix Version/s: SystemML 1.1
resolved by marking the cost as *-1* instead of *0* .
commit -
https://github.com/apache/systemml/commit/53175c00ec4738138985630b888d9b337d7a2ed4
> 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
> Fix For: SystemML 1.1
>
>
> 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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