Class GainRatioAttributeEval

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void buildEvaluator​(Instances data)
      Initializes a gain ratio attribute evaluator.
      double evaluateAttribute​(int attribute)
      evaluates an individual attribute by measuring the gain ratio of the class given the attribute.
      Capabilities getCapabilities()
      Returns the capabilities of this evaluator.
      boolean getMissingMerge()
      get whether missing values are being distributed or not
      java.lang.String[] getOptions()
      Gets the current settings of WrapperSubsetEval.
      java.lang.String getRevision()
      Returns the revision string.
      java.lang.String globalInfo()
      Returns a string describing this attribute evaluator
      java.util.Enumeration listOptions()
      Returns an enumeration describing the available options.
      static void main​(java.lang.String[] args)
      Main method.
      java.lang.String missingMergeTipText()
      Returns the tip text for this property
      int[] postProcess​(int[] attributeSet)
      Provides a chance for a attribute evaluator to do any special post processing of the selected attribute set.
      void setMissingMerge​(boolean b)
      distribute the counts for missing values across observed values
      void setOptions​(java.lang.String[] options)
      Parses a given list of options.
      java.lang.String toString()
      Return a description of the evaluator
      • Methods inherited from class java.lang.Object

        equals, getClass, hashCode, notify, notifyAll, wait, wait, wait
    • Constructor Detail

      • GainRatioAttributeEval

        public GainRatioAttributeEval()
        Constructor
    • Method Detail

      • globalInfo

        public java.lang.String globalInfo()
        Returns a string describing this attribute evaluator
        Returns:
        a description of the evaluator suitable for displaying in the explorer/experimenter gui
      • listOptions

        public java.util.Enumeration listOptions()
        Returns an enumeration describing the available options.
        Specified by:
        listOptions in interface OptionHandler
        Returns:
        an enumeration of all the available options.
      • setOptions

        public void setOptions​(java.lang.String[] options)
                        throws java.lang.Exception
        Parses a given list of options.

        Valid options are:

         -M
          treat missing values as a seperate value.
         
        Specified by:
        setOptions in interface OptionHandler
        Parameters:
        options - the list of options as an array of strings
        Throws:
        java.lang.Exception - if an option is not supported
      • missingMergeTipText

        public java.lang.String missingMergeTipText()
        Returns the tip text for this property
        Returns:
        tip text for this property suitable for displaying in the explorer/experimenter gui
      • setMissingMerge

        public void setMissingMerge​(boolean b)
        distribute the counts for missing values across observed values
        Parameters:
        b - true=distribute missing values.
      • getMissingMerge

        public boolean getMissingMerge()
        get whether missing values are being distributed or not
        Returns:
        true if missing values are being distributed.
      • getOptions

        public java.lang.String[] getOptions()
        Gets the current settings of WrapperSubsetEval.
        Specified by:
        getOptions in interface OptionHandler
        Returns:
        an array of strings suitable for passing to setOptions()
      • buildEvaluator

        public void buildEvaluator​(Instances data)
                            throws java.lang.Exception
        Initializes a gain ratio attribute evaluator. Discretizes all attributes that are numeric.
        Specified by:
        buildEvaluator in class ASEvaluation
        Parameters:
        data - set of instances serving as training data
        Throws:
        java.lang.Exception - if the evaluator has not been generated successfully
      • evaluateAttribute

        public double evaluateAttribute​(int attribute)
                                 throws java.lang.Exception
        evaluates an individual attribute by measuring the gain ratio of the class given the attribute.
        Specified by:
        evaluateAttribute in interface AttributeEvaluator
        Parameters:
        attribute - the index of the attribute to be evaluated
        Returns:
        the gain ratio
        Throws:
        java.lang.Exception - if the attribute could not be evaluated
      • toString

        public java.lang.String toString()
        Return a description of the evaluator
        Overrides:
        toString in class java.lang.Object
        Returns:
        description as a string
      • postProcess

        public int[] postProcess​(int[] attributeSet)
        Description copied from class: ASEvaluation
        Provides a chance for a attribute evaluator to do any special post processing of the selected attribute set.
        Overrides:
        postProcess in class ASEvaluation
        Parameters:
        attributeSet - the set of attributes found by the search
        Returns:
        a possibly ranked list of postprocessed attributes
      • main

        public static void main​(java.lang.String[] args)
        Main method.
        Parameters:
        args - the options -t training file