Github user BryanCutler commented on the issue:
https://github.com/apache/spark/pull/18982
@holdenk , the error was because I was calling `setDefault` with a separate
`Param` and value. So for something like a `seed` param, the Long value would
get converted to an Int in the exchange to Java if using Python 3 and then
cause a cast error. The only solution I could find was to create another
method in Scala that takes a single `ParamPair` value because I just couldn't
get the existing `setDefault` for a list of `ParamPair`s to work. Let me know
if this sounds ok or you have another idea. Thanks!
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