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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