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https://issues.apache.org/jira/browse/SYSTEMML-1663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16045463#comment-16045463
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Dylan Hutchison commented on SYSTEMML-1663:
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See PR at https://github.com/apache/systemml/pull/540
> 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
> 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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