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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