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https://issues.apache.org/jira/browse/MAHOUT-1719?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitriy Lyubimov resolved MAHOUT-1719.
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Resolution: Fixed
> Unary elementwise function operator and function fusions
> --------------------------------------------------------
>
> Key: MAHOUT-1719
> URL: https://issues.apache.org/jira/browse/MAHOUT-1719
> Project: Mahout
> Issue Type: Improvement
> Reporter: Dmitriy Lyubimov
> Assignee: Dmitriy Lyubimov
> Fix For: 0.10.2
>
>
> optimizer rewrites for something like 1 + drmX * dexp(drmX) => collapse into
> elementwiseFunc(f1(f2(drmX)) where f1 = 1 + x and f2 = exp(x). Also absolutes
> current scalar-elementwise physical operators used for stull like 1+drmX .
> PR https://github.com/apache/mahout/pull/135
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