Github user MLnick commented on the pull request:
https://github.com/apache/spark/pull/11216#issuecomment-187700646
@mengxr I could see value `1` being used in a cross-validation setup. But
do we really want to allow `<=0` param values? I don't think it makes a lot of
sense to return a zero-length vector for a non-zero length input. There's no
real use case for this.
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