Github user sethah commented on a diff in the pull request: https://github.com/apache/spark/pull/8734#discussion_r50361275 --- Diff: mllib/src/main/scala/org/apache/spark/ml/tree/impl/RandomForest.scala --- @@ -740,7 +740,7 @@ private[ml] object RandomForest extends Logging { val categoryStats = binAggregates.getImpurityCalculator(nodeFeatureOffset, featureValue) val centroid = if (categoryStats.count != 0) { - categoryStats.predict + categoryStats.prob(categoryStats.predict) --- End diff -- Finding the _proportion_ falling in outcome class 1 simply requires division of the counts by a constant. Since we're just using that number for an ordering, constant division won't matter. They are the same. My initial comment has a typo. It should say for a "binary **outcome**", not "binary category".
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