Joseph K. Bradley created SPARK-9077:
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             Summary: Improve error message for decision trees when numExamples 
< maxCategoriesPerFeature
                 Key: SPARK-9077
                 URL: https://issues.apache.org/jira/browse/SPARK-9077
             Project: Spark
          Issue Type: Improvement
          Components: MLlib
            Reporter: Joseph K. Bradley
            Priority: Trivial


See [SPARK-9075]'s discussion for details.  We should improve the current error 
message to recommend that the user remove the high-arity categorical features.



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