Package weka.attributeSelection

Class CostSensitiveAttributeEval

  • All Implemented Interfaces:
    java.io.Serializable, AttributeEvaluator, CapabilitiesHandler, OptionHandler, RevisionHandler
    public class CostSensitiveAttributeEval
extends CostSensitiveASEvaluation
implements java.io.Serializable, AttributeEvaluator, OptionHandler
    A meta subset evaluator that makes its base subset evaluator cost-sensitive.

    Valid options are: 

     -C <cost file name>
  File name of a cost matrix to use. If this is not supplied,
  a cost matrix will be loaded on demand. The name of the
  on-demand file is the relation name of the training data
  plus ".cost", and the path to the on-demand file is
  specified with the -N option.
     -N <directory>
  Name of a directory to search for cost files when loading
  costs on demand (default current directory).
     -cost-matrix <matrix>
  The cost matrix in Matlab single line format.
     -S <integer>
  The seed to use for random number generation.
     -W
  Full name of base evaluator.
  (default: weka.attributeSelection.ReliefFAttributeEval)
     
 Options specific to evaluator weka.attributeSelection.ReliefFAttributeEval:
 
     -M <num instances>
  Specify the number of instances to
  sample when estimating attributes.
  If not specified, then all instances
  will be used.
     -D <seed>
  Seed for randomly sampling instances.
  (Default = 1)
     -K <number of neighbours>
  Number of nearest neighbours (k) used
  to estimate attribute relevances
  (Default = 10).
     -W
  Weight nearest neighbours by distance
     -A <num>
  Specify sigma value (used in an exp
  function to control how quickly
  weights for more distant instances
  decrease. Use in conjunction with -W.
  Sensible value=1/5 to 1/10 of the
  number of nearest neighbours.
  (Default = 2)
    Version:
    $Revision: 5562 $
    Author:
    Mark Hall (mhall{[at]}pentaho{[dot]}com)
    See Also:
    Serialized Form

    • Constructor Detail

      • CostSensitiveAttributeEval

        public CostSensitiveAttributeEval()
        Default constructor.

    • Method Detail

      • setEvaluator

        public void setEvaluator​(ASEvaluation newEvaluator)
                  throws java.lang.IllegalArgumentException
        Set the base evaluator.
        Overrides:
        setEvaluator in class CostSensitiveASEvaluation
        Parameters:
        newEvaluator - the evaluator to use.
        Throws:
        java.lang.IllegalArgumentException - if the evaluator is not an instance of AttributeEvaluator

      • evaluateAttribute

        public double evaluateAttribute​(int attribute)
                         throws java.lang.Exception
        Evaluates an individual attribute. Delegates the actual evaluation to the base attribute evaluator.
        Specified by:
        evaluateAttribute in interface AttributeEvaluator
        Parameters:
        attribute - the index of the attribute to be evaluated
        Returns:
        the "merit" of the attribute
        Throws:
        java.lang.Exception - if the attribute could not be evaluated

      • main

        public static void main​(java.lang.String[] args)
        Main method for testing this class.
        Parameters:
        args - the options