Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/21163#discussion_r185628460
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/tree/impl/RandomForest.scala ---
@@ -22,12 +22,11 @@ import java.io.IOException
import scala.collection.mutable
import scala.util.Random
-import org.apache.spark.internal.Logging
import org.apache.spark.ml.classification.DecisionTreeClassificationModel
import org.apache.spark.ml.feature.LabeledPoint
import org.apache.spark.ml.regression.DecisionTreeRegressionModel
import org.apache.spark.ml.tree._
-import org.apache.spark.ml.util.Instrumentation
+import org.apache.spark.ml.util.{Instrumentation, OptionalInstrumentation}
--- End diff --
Instrumentation is no longer needed
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