weka.attributeSelection

Class FilteredAttributeEval

java.lang.Object

weka.attributeSelection.ASEvaluation

weka.attributeSelection.FilteredAttributeEval

All Implemented Interfaces:

Serializable, AttributeEvaluator, CapabilitiesHandler, OptionHandler, RevisionHandler

public class FilteredAttributeEval
extends ASEvaluation
implements Serializable, AttributeEvaluator, OptionHandler

Class for running an arbitrary attribute evaluator on data that has been passed through an arbitrary filter (note: filters that alter the order or number of attributes are not allowed). Like the evaluator, the structure of the filter is based exclusively on the training data.

Valid options are:

 -W <evaluator specification>
  Full name of base evaluator to use, followed by evaluator options.
  eg: "weka.attributeSelection.InfoGainAttributeEval -M"

 -F <filter specification>
  Full class name of filter to use, followed
  by filter options.
  eg: "weka.filters.supervised.instance.SpreadSubsample -M 1"

Version:

$Revision: 5562 $

Author:

Mark Hall (mhall{[at]}pentaho{[dot]}com)

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
FilteredAttributeEval()

Method Summary

Modifier and Type	Method and Description
String	attributeEvaluatorTipText() Returns the tip text for this property
void	buildEvaluator(Instances data) Initializes a filtered attribute evaluator.
double	evaluateAttribute(int attribute) Evaluates an individual attribute by delegating to the base evaluator.
String	filterTipText() Returns the tip text for this property
ASEvaluation	getAttributeEvaluator() Get the attribute evaluator to use
Capabilities	getCapabilities() Returns default capabilities of the evaluator.
Filter	getFilter() Get the filter to use
String[]	getOptions() Gets the current settings of the subset evaluator.
String	getRevision() Returns the revision string.
String	globalInfo()
Enumeration	listOptions() Returns an enumeration describing the available options.
static void	main(String[] args) Main method for testing this class.
void	setAttributeEvaluator(ASEvaluation newEvaluator) Set the attribute evaluator to use
void	setFilter(Filter newFilter) Set the filter to use
void	setOptions(String[] options) Parses a given list of options.
String	toString() Describe the attribute evaluator

Methods inherited from class weka.attributeSelection.ASEvaluation

clean, forName, makeCopies, postProcess

Methods inherited from class java.lang.Object

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

Constructor Detail

FilteredAttributeEval

public FilteredAttributeEval()

Method Detail

getCapabilities

public Capabilities getCapabilities()

Returns default capabilities of the evaluator.

Specified by:

getCapabilities in interface CapabilitiesHandler

Overrides:

getCapabilities in class ASEvaluation

Returns:

the capabilities of this evaluator.

See Also:

Capabilities

globalInfo

public String globalInfo()

Returns:

a description of the evaluator suitable for displaying in the explorer/experimenter gui

listOptions

public 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(String[] options)
                throws Exception

Parses a given list of options.

Valid options are:

 -W <evaluator specification>
  Full name of base evaluator to use, followed by evaluator options.
  eg: "weka.attributeSelection.InfoGainAttributeEval -M"

 -F <filter specification>
  Full class name of filter to use, followed
  by filter options.
  eg: "weka.filters.supervised.instance.SpreadSubsample -M 1"

Specified by:

setOptions in interface OptionHandler

Parameters:

options - the list of options as an array of strings

Throws:

Exception - if an option is not supported

getOptions

public String[] getOptions()

Gets the current settings of the subset evaluator.

Specified by:

getOptions in interface OptionHandler

Returns:

an array of strings suitable for passing to setOptions

attributeEvaluatorTipText

public String attributeEvaluatorTipText()

Returns the tip text for this property

Returns:

tip text for this property suitable for displaying in the explorer/experimenter gui

setAttributeEvaluator

public void setAttributeEvaluator(ASEvaluation newEvaluator)

Set the attribute evaluator to use

Parameters:

newEvaluator - the attribute evaluator to use

getAttributeEvaluator

public ASEvaluation getAttributeEvaluator()

Get the attribute evaluator to use

Returns:

the attribute evaluator to use

filterTipText

public String filterTipText()

Returns the tip text for this property

Returns:

tip text for this property suitable for displaying in the explorer/experimenter gui

setFilter

public void setFilter(Filter newFilter)

Set the filter to use

Parameters:

newFilter - the filter to use

getFilter

public Filter getFilter()

Get the filter to use

Returns:

the filter to use

getRevision

public String getRevision()

Returns the revision string.

Specified by:

getRevision in interface RevisionHandler

Overrides:

getRevision in class ASEvaluation

Returns:

the revision

buildEvaluator

public void buildEvaluator(Instances data)
                    throws Exception

Initializes a filtered attribute evaluator.

Specified by:

buildEvaluator in class ASEvaluation

Parameters:

data - set of instances serving as training data

Throws:

Exception - if the evaluator has not been generated successfully

evaluateAttribute

public double evaluateAttribute(int attribute)
                         throws Exception

Evaluates an individual attribute by delegating to the base evaluator.

Specified by:

evaluateAttribute in interface AttributeEvaluator

Parameters:

attribute - the index of the attribute to be evaluated

Returns:

the merit of the attribute according to the base evaluator

Throws:

Exception - if the attribute could not be evaluated

toString

public String toString()

Describe the attribute evaluator

Overrides:

toString in class Object

Returns:

a description of the attribute evaluator as a string

main

public static void main(String[] args)

Main method for testing this class.

Parameters:

args - the options