Github user MLnick commented on the issue:
https://github.com/apache/spark/pull/17306
I commented on the linked JIRA also.
In principle I think this can be a useful enhancement and yes the better
efficiency on the caching side is a good benefit. I'd actually been thinking
about a (simpler) version that would allow multiple`Predictors` to be the last
stages of a pipeline, and return the best from those - so evaluating a set of
algorithms at the same time (but keeping the preceding pipeline stages common).
This is a generalization of that idea.
I think it gels with
[SPARK-19071](https://issues.apache.org/jira/browse/SPARK-19071) and the next
phase of that work that would look at smarter caching & re-use of stages in the
pipeline. Also related to the subtask of that ticket - the parallel CV work in
[SPARK-19357](https://issues.apache.org/jira/browse/SPARK-19357).
Since Spark 2.2 code freeze is imminent, I think this will have to be
delayed a little but it would be good to coordinate with #16774 where
appropriate.
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