Github user sethah commented on a diff in the pull request:
https://github.com/apache/spark/pull/14717#discussion_r75505865
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/classification/LogisticRegression.scala
---
@@ -256,6 +256,15 @@ class LogisticRegression @Since("1.2.0") (
@Since("1.5.0")
override def getThresholds: Array[Double] = super.getThresholds
+ /**
+ * Set suggested depth for treeAggregate or treeReduce (>= 2).
+ * Default is 2.
+ * @group setParam
--- End diff --
This should really be an expert param. Unfortunately, it doesn't seem like
`SharedParamsCodeGen` supports that at the moment. We can either hard code
these to linear/logistic regression (which isn't a terrible idea since it's
hard to predict how reusable this really is) or we can update the code gen file
to support expert.
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