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From "Dylan Hutchison (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SYSTEMML-1663) New simplification rewrite for binary multiplication chains
Date Sat, 15 Jul 2017 05:15:01 GMT

    [ https://issues.apache.org/jira/browse/SYSTEMML-1663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16088466#comment-16088466
] 

Dylan Hutchison commented on SYSTEMML-1663:
-------------------------------------------

Now resolved

> New simplification rewrite for binary multiplication chains
> -----------------------------------------------------------
>
>                 Key: SYSTEMML-1663
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1663
>             Project: SystemML
>          Issue Type: Sub-task
>          Components: Compiler
>            Reporter: Matthias Boehm
>            Assignee: Dylan Hutchison
>              Labels: beginner
>             Fix For: SystemML 1.0
>
>
> There are various scripts that use chains of binary element-wise multiplications such
as {{A * B * B}} or {{B * A * B}}, which are currently compiled to {{(A * B) * B}} and {{(B
* A) * B}}, respectively. We should explicitly reason about and simply this to expose the
unary operation {{B^2}} which can be evaluated much more efficiently, in case of both singlenode
and distributed operations. 



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