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From nseggert <>
Subject SPARK-17455 Isotonic Regression fix languishing
Date Tue, 13 Dec 2016 16:31:23 GMT
I have PR that has been sitting untouched for months. Could someone please
take a look at it? (SPARK-17455) in JIRA.

This PR fixes problems with the way isotonic regression was implemented that
caused it to take exponential time for some inputs. This problem made it
unusable for me, because I occasionally hit those cases. I'd assume it's
very likely to affect others as well. 

My patch just translates the scikit-learn implementation into Scala, so I
think it should be fairly uncontroversial.

Also note that although this is a change to the mllib code, this is one of
those cases where the ml implementation just calls the mllib version.

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