zhengruifeng created SPARK-29116:
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Summary: Refactor py classes related to DecisionTree
Key: SPARK-29116
URL: https://issues.apache.org/jira/browse/SPARK-29116
Project: Spark
Issue Type: Sub-task
Components: ML, PySpark
Affects Versions: 3.0.0
Reporter: zhengruifeng
1, Like the scala side, move related classes to a seperate file 'tree.py'
2, add method 'predictLeaf' in 'DecisionTreeModel' & 'TreeEnsembleModel'
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