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From "Janardhan (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SYSTEMML-2161) Suboptimal codegen plans for ALS due to wrong cost model memoization
Date Sat, 24 Feb 2018 05:27:00 GMT

     [ https://issues.apache.org/jira/browse/SYSTEMML-2161?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Janardhan resolved SYSTEMML-2161.
---------------------------------
       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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