[jira] [Assigned] (SYSTEMML-488) Generalized wdivmm w/ 4 operands

["Matthias Boehm (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SYSTEMML-488?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias Boehm reassigned SYSTEMML-488:
---------------------------------------

    Assignee: Matthias Boehm

> Generalized wdivmm w/ 4 operands
> --------------------------------
>
>                 Key: SYSTEMML-488
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-488
>             Project: SystemML
>          Issue Type: Task
>          Components: Compiler, Runtime
>            Reporter: Matthias Boehm
>            Assignee: Matthias Boehm
>
> The physical operator wdivmm currently supports only three operands or four operands where one operands is derived with (X!=0) from another operand X. However, there are various algorithms, where we have patterns as follows:
> {code}
> (W * (L %*% t(R) - X)) %*% R
> t(t(L) %*% W * (L %*% t(R) - X))
> {code} 
> In order to support arbitrary W in above patterns, we need to generalize the compiler/runtime (of all backends) to support 4 operands similar to the existing wsloss operator.



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