Github user yanboliang commented on a diff in the pull request: https://github.com/apache/spark/pull/14717#discussion_r75573599 --- Diff: mllib/src/main/scala/org/apache/spark/ml/regression/LinearRegression.scala --- @@ -172,6 +173,17 @@ class LinearRegression @Since("1.3.0") (@Since("1.3.0") override val uid: String def setSolver(value: String): this.type = set(solver, value) setDefault(solver -> "auto") + /** + * Suggested depth for treeAggregate (>= 2). + * If the dimensions of features or the number of partitions are large, + * this param could be adjusted to a larger size. + * Default is 2. + * @group expertParam --- End diff -- ```expertSetParam```
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