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https://issues.apache.org/jira/browse/SYSTEMML-488?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm resolved SYSTEMML-488.
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Resolution: Done
> 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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