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https://issues.apache.org/jira/browse/SYSTEMML-1747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16159670#comment-16159670
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Glenn Weidner commented on SYSTEMML-1747:
-----------------------------------------
Related commit
[988366d|https://github.com/apache/systemml/commit/988366de0300c43ec5b01e129576278c59fa49be].
> 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
>
> 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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