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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