Github user yanboliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/7694#discussion_r35959932
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/model/InformationGainStats.scala
---
@@ -76,3 +77,52 @@ private[spark] object InformationGainStats {
val invalidInformationGainStats = new
InformationGainStats(Double.MinValue, -1.0, -1.0, -1.0,
new Predict(0.0, 0.0), new Predict(0.0, 0.0))
}
+
+class ImpurityStats(
+ val gain: Double,
+ val impurity: Double,
+ val impurityCalculator: ImpurityCalculator,
+ val leftImpurityCalculator: ImpurityCalculator,
+ val rightImpurityCalculator: ImpurityCalculator) extends Serializable {
+
+ override def toString: String = {
+ s"gain = $gain, impurity = $impurity, left impurity = $leftImpurity, "
+
+ s"right impurity = $rightImpurity"
+ }
+
+ def leftImpurity: Double = leftImpurityCalculator.calculate()
+
+ def rightImpurity: Double = rightImpurityCalculator.calculate()
+
+ override def equals(o: Any): Boolean = o match {
+ case other: ImpurityStats =>
+ gain == other.gain &&
--- End diff --
done
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