Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/19433#discussion_r150352747
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/model/InformationGainStats.scala
---
@@ -112,7 +113,7 @@ private[spark] object ImpurityStats {
* minimum number of instances per node.
*/
def getInvalidImpurityStats(impurityCalculator: ImpurityCalculator):
ImpurityStats = {
- new ImpurityStats(Double.MinValue, impurityCalculator.calculate(),
+ new ImpurityStats(Double.MinValue, impurity = -1,
--- End diff --
Q: Why -1 here?
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