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https://issues.apache.org/jira/browse/SYSTEMML-1747?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-1747.
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Resolution: Fixed
Assignee: Matthias Boehm
Fix Version/s: SystemML 0.15
> New rewrite and performance binary outer operations
> ---------------------------------------------------
>
> Key: SYSTEMML-1747
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1747
> Project: SystemML
> Issue Type: Task
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Fix For: SystemML 0.15
>
>
> In a number of scripts we see unnecessary column replication as a
> pre-processing steps for matrix-vector operations although these operations
> could be directly realized via {{outer}}. Hence, this task aims to
> automatically rewrite such patterns as follows
> {code}
> (a %*% ones) == b) -> outer(a, b, "==")
> {code}
> which applies to any binary comparison, arithmetic or builtin operation.
> Furthermore, this task should also cleanup unnecessary inefficiencies in the
> existing outer operations (e.g., unnecessary deep vector copies, avoid binary
> search for small number of rhs columns).
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