weka.attributeSelection

Class FilteredSubsetEval

java.lang.Object

weka.attributeSelection.ASEvaluation

weka.attributeSelection.FilteredSubsetEval

All Implemented Interfaces:

Serializable, SubsetEvaluator, CapabilitiesHandler, OptionHandler, RevisionHandler

public class FilteredSubsetEval
extends ASEvaluation
implements Serializable, SubsetEvaluator, OptionHandler

Class for running an arbitrary subset 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.CfsSubsetEval -L"

 -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
FilteredSubsetEval()

Method Summary

Modifier and Type	Method and Description
void	buildEvaluator(Instances data) Initializes a filtered attribute evaluator.
double	evaluateSubset(BitSet subset) evaluates a subset of attributes
String	filterTipText() Returns the tip text for this property
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.
ASEvaluation	getSubsetEvaluator() Get the subset evaluator to use
String	globalInfo()
Enumeration	listOptions() Returns an enumeration describing the available options.
static void	main(String[] args) Main method for testing this class.
void	setFilter(Filter newFilter) Set the filter to use
void	setOptions(String[] options) Parses a given list of options.
void	setSubsetEvaluator(ASEvaluation newEvaluator) Set the subset evaluator to use
String	subsetEvaluatorTipText() Returns the tip text for this property
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

FilteredSubsetEval

public FilteredSubsetEval()

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.CfsSubsetEval -L"

 -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

subsetEvaluatorTipText

public String subsetEvaluatorTipText()

Returns the tip text for this property

Returns:

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

setSubsetEvaluator

public void setSubsetEvaluator(ASEvaluation newEvaluator)

Set the subset evaluator to use

Parameters:

newEvaluator - the subset evaluator to use

getSubsetEvaluator

public ASEvaluation getSubsetEvaluator()

Get the subset evaluator to use

Returns:

the subset 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

evaluateSubset

public double evaluateSubset(BitSet subset)
                      throws Exception

evaluates a subset of attributes

Specified by:

evaluateSubset in interface SubsetEvaluator

Parameters:

subset - a bitset representing the attribute subset to be evaluated

Returns:

the "merit" of the subset

Throws:

Exception - if the subset 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