Package weka.classifiers.trees.m5

Class CorrelationSplitInfo

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Cloneable, SplitEvaluate, RevisionHandler
    public final class CorrelationSplitInfo
extends java.lang.Object
implements java.lang.Cloneable, java.io.Serializable, SplitEvaluate, RevisionHandler
    Finds split points using correlation.
    Version:
    $Revision: 1.4 $
    Author:
    Mark Hall (mhall@cs.waikato.ac.nz)
    See Also:
    Serialized Form

    • Constructor Summary

      Constructors 
      Constructor Description
      CorrelationSplitInfo​(int low, int high, int attr)
      Constructs an object which contains the split information

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void attrSplit​(int attr, Instances inst)
      Finds the best splitting point for an attribute in the instances
      SplitEvaluate copy()
      Makes a copy of this CorrelationSplitInfo object
      java.lang.String getRevision()
      Returns the revision string.
      void initialize​(int low, int high, int attr)
      Resets the object of split information
      double maxImpurity()
      Returns the impurity of this split
      int position()
      Returns the position of the split in the sorted values.
      int splitAttr()
      Returns the attribute used in this split
      double splitValue()
      Returns the split value

      • Methods inherited from class java.lang.Object

        equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • CorrelationSplitInfo

        public CorrelationSplitInfo​(int low,
                            int high,
                            int attr)
        Constructs an object which contains the split information
        Parameters:
        low - the index of the first instance
        high - the index of the last instance
        attr - an attribute

    • Method Detail

      • copy

        public final SplitEvaluate copy()
                         throws java.lang.Exception
        Makes a copy of this CorrelationSplitInfo object
        Specified by:
        copy in interface SplitEvaluate
        Returns:
        a copy of the object
        Throws:
        java.lang.Exception

      • initialize

        public final void initialize​(int low,
                             int high,
                             int attr)
        Resets the object of split information
        Parameters:
        low - the index of the first instance
        high - the index of the last instance
        attr - the attribute

      • attrSplit

        public final void attrSplit​(int attr,
                            Instances inst)
                     throws java.lang.Exception
        Finds the best splitting point for an attribute in the instances
        Specified by:
        attrSplit in interface SplitEvaluate
        Parameters:
        attr - the splitting attribute
        inst - the instances
        Throws:
        java.lang.Exception - if something goes wrong

      • maxImpurity

        public double maxImpurity()
        Returns the impurity of this split
        Specified by:
        maxImpurity in interface SplitEvaluate
        Returns:
        the impurity of this split

      • splitAttr

        public int splitAttr()
        Returns the attribute used in this split
        Specified by:
        splitAttr in interface SplitEvaluate
        Returns:
        the attribute used in this split

      • position

        public int position()
        Returns the position of the split in the sorted values. -1 indicates that a split could not be found.
        Specified by:
        position in interface SplitEvaluate
        Returns:
        an int value

      • splitValue

        public double splitValue()
        Returns the split value
        Specified by:
        splitValue in interface SplitEvaluate
        Returns:
        the split value

      • getRevision

        public java.lang.String getRevision()
        Returns the revision string.
        Specified by:
        getRevision in interface RevisionHandler
        Returns:
        the revision