Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/19586
and in `ml`, if we want to register class before running algos, Some other
classes like `LabeledPoint`, `Instance` also need registered.
and there're some class temporary defined in some ml algos (when using RDD).
Maybe better way is to register classes automatically if possible. E.g.
when using kyro, auto detecting which classes are used frequently, and register
them?
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