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[SPARK-12182][ML] Distributed binning for trees in spark.ml
This PR changes the `findSplits` method in spark.ml to perform split calculations on the workers. This PR is meant to copy [PR-8246](https://github.com/apache/spark/pull/8246) which added the same feature for MLlib. Author: sethah <seth.hendrickson16@gmail.com> Closes #10231 from sethah/SPARK-12182.
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- mllib/src/main/scala/org/apache/spark/ml/tree/impl/RandomForest.scala 54 additions, 56 deletions...in/scala/org/apache/spark/ml/tree/impl/RandomForest.scala
- mllib/src/main/scala/org/apache/spark/mllib/tree/DecisionTree.scala 6 additions, 5 deletions...main/scala/org/apache/spark/mllib/tree/DecisionTree.scala
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