weka.attributeSelection

Class CostSensitiveAttributeEval

java.lang.Object

weka.attributeSelection.ASEvaluation

weka.attributeSelection.CostSensitiveASEvaluation

weka.attributeSelection.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

Field Summary

Fields inherited from class weka.attributeSelection.CostSensitiveASEvaluation

MATRIX_ON_DEMAND, MATRIX_SUPPLIED, TAGS_MATRIX_SOURCE

Constructor Summary

Constructors

Constructor and Description
CostSensitiveAttributeEval() Default constructor.

Method Summary

Modifier and Type	Method and Description
java.lang.String	defaultEvaluatorString() Return the name of the default evaluator.
double	evaluateAttribute(int attribute) Evaluates an individual attribute.
java.lang.String	getRevision() Returns the revision string.
static void	main(java.lang.String[] args) Main method for testing this class.
void	setEvaluator(ASEvaluation newEvaluator) Set the base evaluator.

Methods inherited from class weka.attributeSelection.CostSensitiveASEvaluation

buildEvaluator, costMatrixSourceTipText, costMatrixTipText, evaluatorTipText, getCapabilities, getCostMatrix, getCostMatrixSource, getEvaluator, getOnDemandDirectory, getOptions, getSeed, globalInfo, listOptions, onDemandDirectoryTipText, postProcess, seedTipText, setCostMatrix, setCostMatrixSource, setOnDemandDirectory, setOptions, setSeed, toString

Methods inherited from class weka.attributeSelection.ASEvaluation

clean, forName, makeCopies

Methods inherited from class java.lang.Object

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

Methods inherited from interface weka.core.OptionHandler

getOptions, listOptions, setOptions

Constructor Detail

CostSensitiveAttributeEval

public CostSensitiveAttributeEval()

Default constructor.

Method Detail

defaultEvaluatorString

public java.lang.String defaultEvaluatorString()

Return the name of the default evaluator.

Overrides:

defaultEvaluatorString in class CostSensitiveASEvaluation

Returns:

the name of the default evaluator

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

getRevision

public java.lang.String getRevision()

Returns the revision string.

Specified by:

getRevision in interface RevisionHandler

Overrides:

getRevision in class CostSensitiveASEvaluation

Returns:

the revision

main

public static void main(java.lang.String[] args)

Main method for testing this class.

Parameters:

args - the options