Github user zhengruifeng commented on the issue: https://github.com/apache/spark/pull/22974 @srowen Yes, this is the problem. I have to register `Param*` before any prediction model, but there are too many anonymous classes in `ParamValidators` and other places, and I have not found an efficient way to list those anonymous ones. So I wonder whether we could continue to register all of them. Or only list simple classes like `MultivariateGaussian `?
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