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https://issues.apache.org/jira/browse/MAHOUT-2051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16549288#comment-16549288
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ASF GitHub Bot commented on MAHOUT-2051:
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Github user rawkintrevo commented on the issue:
https://github.com/apache/mahout/pull/357
Hey @pschaumann welcome to the community!
Map-Reduce based PRs were stopped in 2014 or 2015.
Here's a quora question answered by two of the PMCs from around that time
explaining why.
https://www.quora.com/Why-Apache-Mahout-stopped-MapReduce-support-for-it-new-algorithms
As Sean said, "No one interested in maintaining it" was one of the main
reasons. We're _considering_ opening it back up for small fixes like this in a
"community maintained" sort of way in an upcoming release, but afaik I'm the
only one who is strongly positive on that idea, other PMCs range from neutral
to negative.
If you check out https://github.com/apache/mahout/tree/branch-0.14.0 make
your PR against that (or perhaps until we've released 0.14.0 and rebase your
master) and _if_ we decide to let PRs like this in then we can merge it against
that.
Thanks again!
> MixedGradient throws a random IllegalStateException
> ---------------------------------------------------
>
> Key: MAHOUT-2051
> URL: https://issues.apache.org/jira/browse/MAHOUT-2051
> Project: Mahout
> Issue Type: Bug
> Components: Classification
> Affects Versions: 1.0.0, 0.12.0, 0.11.2, 0.12.1, 0.13.0, 0.12.2, 0.14.0,
> 0.13.1, 0.13.2
> Reporter: Peter Schaumann
> Priority: Minor
> Fix For: 1.0.0, 0.12.0, 0.11.2, 0.12.1, 0.13.0, 0.12.2, 0.14.0,
> 0.13.1, 0.13.2
>
>
> The function _apply_ in the class _MixedGradient_ throws an exception when
> both variables _hasZero_ and _hasOne_ are _false_. In order for both of them
> to be _true_, the RNG has to pick the basic gradient until both are set to
> _true,_ otherwise _an IllegalStateException_ is thrown.
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