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From "Glenn Weidner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SYSTEMML-1747) New rewrite and performance binary outer operations
Date Sat, 09 Sep 2017 02:07:00 GMT

    [ https://issues.apache.org/jira/browse/SYSTEMML-1747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16159670#comment-16159670
] 

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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