Github user yanboliang commented on the pull request:

    https://github.com/apache/spark/pull/9954#issuecomment-159784336
  
    @jkbradley Users can use ```decision_tree_classification_example.py``` and 
```decision_tree_regression_example.py``` instead to illustrate the usage of 
decision tree algorithm and model. Further more, there is little different 
between these two kind of examples for Java/Python. I still keep the example 
application (with command-line tools one) which has more complete input params 
for Scala one. So I think removing the Java and Python ones is make sense.


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