Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6536#discussion_r31387956
--- Diff:
examples/src/main/scala/org/apache/spark/examples/mllib/DecisionTreeRunner.scala
---
@@ -354,7 +353,11 @@ object DecisionTreeRunner {
/**
* Calculates the mean squared error for regression.
+ *
+ * This is just for demo purpose. In general, don't copy this code
because it is NOT efficient
--- End diff --
cc @mengxr @jkbradley
this is bad ... hopefully nobody cares about performance here.
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