Github user lucio-yz commented on a diff in the pull request: https://github.com/apache/spark/pull/20472#discussion_r165595281 --- Diff: mllib/src/main/scala/org/apache/spark/ml/tree/impl/RandomForest.scala --- @@ -1002,10 +1008,14 @@ private[spark] object RandomForest extends Logging { val numSplits = metadata.numSplits(featureIndex) // get count for each distinct value - val (valueCountMap, numSamples) = featureSamples.foldLeft((Map.empty[Double, Int], 0)) { + var (valueCountMap, numSamples) = featureSamples.foldLeft((Map.empty[Double, Int], 0)) { --- End diff -- problem has been solved
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