Github user rdelassus commented on the issue:
https://github.com/apache/spark/pull/14640
There is an infinite number of ways to make folds. Until now we had the
mlutils kfold. You want to add the groupedKfold. But I don't think we should
add one by one every folding method that can be useful, thus adding (like you
did) "if my method else if this othermethod [...] else kfold". It would be far
better to make the folding method independant from the crossvalidator class,
and pass it as an argument for example.
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