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Posted to issues@spark.apache.org by "caoli (JIRA)" <ji...@apache.org> on 2014/06/17 02:55:02 UTC

[jira] [Created] (SPARK-2160) error of Decision tree algorithm in Spark MLlib

caoli created SPARK-2160:
----------------------------

             Summary: error of  Decision tree algorithm  in Spark MLlib 
                 Key: SPARK-2160
                 URL: https://issues.apache.org/jira/browse/SPARK-2160
             Project: Spark
          Issue Type: Bug
          Components: MLlib
    Affects Versions: 1.0.0
            Reporter: caoli
             Fix For: 1.1.0


the error of comput rightNodeAgg about  Decision tree algorithm  in Spark MLlib  , in the function extractLeftRightNodeAggregates() ,when compute rightNodeAgg  used bindata index is error. in the DecisionTree.scala file about  Line980:

             rightNodeAgg(featureIndex)(2 * (numBins - 2 - splitIndex)) =
                binData(shift + (2 * (numBins - 2 - splitIndex))) +
                  rightNodeAgg(featureIndex)(2 * (numBins - 1 - splitIndex))    

 the   binData(shift + (2 * (numBins - 2 - splitIndex)))  index compute is error, so the result of rightNodeAgg  include  repeated data about "bins"  



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