Github user petro-rudenko commented on the pull request:
https://github.com/apache/spark/pull/5510#issuecomment-94418041
For my case i can live with default behaviour. It's just not intuitive that
empty ParamGridBuilder returns array of size 1 and also not clear how to handle
just 1 parameter. E.g. if there's only 1 param just set it explicitly and not
use crossvalidation.
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