Github user leifker commented on the issue:
https://github.com/apache/spark/pull/17306
Sorry of the delayed response @BryanCutler, that's pretty neat, however
this will perform unneeded work as it will execute nonsensical combinations of
parameters. For example, if pipeline2 is executed (decision tree), the code
will run the pipeline with lr.regParam set to 0.1 and 0.01 which doesn't matter
since we're using the decision tree algorithm.
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