Github user hqzizania commented on the issue:
https://github.com/apache/spark/pull/14640
This work may be similar with
[SPARK-8971](https://github.com/apache/spark/pull/14321) which is another
variation of KFold, and very significant in some cases. I suppose it is okay
to add to .mllib like the latter PR, but we could add its use to CrossValidator
in .ml. @sethah @MLnick @yanboliang
BTW, fortunately, it seems to be easier to implement than the
kFoldStratified, as it does not need to change underlying codes, such as in
rdd/PairRDDFunctions.
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