Github user zhengruifeng commented on the issue:
https://github.com/apache/spark/pull/22974
I am not sure, but maybe all serializable classes need to be registered.
Since `MultivariateGaussian` is a public class, so I think we need to add
it.
I also wonder whether a test is needed. If no longer needed, I can list all
other public ones in ML in this PR.
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