Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/5510#issuecomment-93056773
@srowen @petro-rudenko My only question about this patch is what to do with
CrossValidator. Users will likely try passing an empty grid to CrossValidator
sometime in the future. Should CrossValidator fail with an error message, or
should it train with the estimator's built-in parameters?
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