Github user zhengruifeng commented on the issue:
https://github.com/apache/spark/pull/22087
Sounds good to design a universal prediction model as a super-class.
BTW, I think we can also create a new class `ProbabilisticPredictionModel`
(as a subclass of `PredictionModel`), so that we can let soft-clustering model
extends it to expose method `predictProbability`.
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