[jira] [Closed] (SYSTEMML-1747) New rewrite and performance binary outer operations

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

     [ https://issues.apache.org/jira/browse/SYSTEMML-1747?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias Boehm closed SYSTEMML-1747.
------------------------------------
       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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