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https://issues.apache.org/jira/browse/SYSTEMML-1641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16028608#comment-16028608
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Matthias Boehm commented on SYSTEMML-1641:
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Btw, an example where this issue led to disastrous performance was PageRank.
> Matrix multiplication chain opt not applied
> -------------------------------------------
>
> Key: SYSTEMML-1641
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1641
> Project: SystemML
> Issue Type: Bug
> Affects Versions: SystemML 0.14
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Fix For: SystemML 1.0
>
>
> A recent change in SystemML 0.14 that simplified the hop visit status
> introduced a bug in our matrix multiplication chain optimization rewrite,
> which effectively disabled this rewrite altogether.
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