Github user sethah commented on a diff in the pull request:
https://github.com/apache/spark/pull/20632#discussion_r171071028
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/tree/impl/RandomForest.scala ---
@@ -92,6 +92,7 @@ private[spark] object RandomForest extends Logging {
featureSubsetStrategy: String,
seed: Long,
instr: Option[Instrumentation[_]],
+ prune: Boolean = true,
--- End diff --
how about a comment here: `prune: Boolean = true, // exposed for testing
only, real trees are always pruned`
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