Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/19950
And, these items added cannot cover the case in `MultilayerPeceptron`. Look
at `FeedForwardTrainer.train`, the persisted stacked `trainData`, the format is
`RDD[(Double, mllib.Vector)]`. The registered classes here do not cover this.
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