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## 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
`CostSensitiveAttributeEval()` Default constructor.

Method Summary
`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
`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

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