Github user zhengruifeng commented on the issue:
https://github.com/apache/spark/pull/17910
@hhbyyh I find that param in `ALS` and `treeParams` is lowered in the
getter, and the getter instead of the param is used in the algs.
https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala#L125
https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/ml/tree/treeParams.scala#L236
I think it maybe better to follow this way.
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