huaxingao opened a new pull request #25929: [SPARK-29116][PYTHON][ML] Refactor py classes related to DecisionTree URL: https://github.com/apache/spark/pull/25929 ### What changes were proposed in this pull request? - Move tree related classes to a separate file ```tree.py``` - add method ```predictLeaf``` in ```DecisionTreeModel```& ```TreeEnsembleModel``` ### Why are the changes needed? - keep parity between scala and python - easy code maintenance ### Does this PR introduce any user-facing change? Yes add method ```predictLeaf``` in ```DecisionTreeModel```& ```TreeEnsembleModel``` add ```setMinWeightFractionPerNode``` in ```DecisionTreeClassifier``` and ```DecisionTreeRegressor``` ### How was this patch tested? add some doc tests
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