类 GainRatioAttributeEval
java.lang.Object
weka.attributeSelection.ASEvaluation
weka.attributeSelection.GainRatioAttributeEval
public class GainRatioAttributeEval
extends ASEvaluation
implements AttributeEvaluator, OptionHandler
GainRatioAttributeEval :
Evaluates the worth of an attribute by measuring the gain ratio with respect to the class.
GainR(Class, Attribute) = (H(Class) - H(Class | Attribute)) / H(Attribute).
Valid options are:
Evaluates the worth of an attribute by measuring the gain ratio with respect to the class.
GainR(Class, Attribute) = (H(Class) - H(Class | Attribute)) / H(Attribute).
Valid options are:
-M treat missing values as a seperate value.
- 版本:
- $Revision: 11219 $
- 作者:
- Mark Hall (mhall@cs.waikato.ac.nz)
- 另请参阅:
-
构造器概要
构造器 -
方法概要
修饰符和类型方法说明void
buildEvaluator
(Instances data) Initializes a gain ratio attribute evaluator.double
evaluateAttribute
(int attribute) evaluates an individual attribute by measuring the gain ratio of the class given the attribute.Returns the capabilities of this evaluator.boolean
get whether missing values are being distributed or notString[]
Gets the current settings of WrapperSubsetEval.Returns the revision string.Returns a string describing this attribute evaluatorReturns an enumeration describing the available options.static void
Main method.Returns the tip text for this propertyint[]
postProcess
(int[] attributeSet) Provides a chance for a attribute evaluator to do any special post processing of the selected attribute set.void
setMissingMerge
(boolean b) distribute the counts for missing values across observed valuesvoid
setOptions
(String[] options) Parses a given list of options.toString()
Return a description of the evaluator从类继承的方法 weka.attributeSelection.ASEvaluation
clean, forName, makeCopies
-
构造器详细资料
-
GainRatioAttributeEval
public GainRatioAttributeEval()Constructor
-
-
方法详细资料
-
globalInfo
Returns a string describing this attribute evaluator- 返回:
- a description of the evaluator suitable for displaying in the explorer/experimenter gui
-
listOptions
Returns an enumeration describing the available options.- 指定者:
listOptions
在接口中OptionHandler
- 返回:
- an enumeration of all the available options.
-
setOptions
Parses a given list of options. Valid options are:-M treat missing values as a seperate value.
- 指定者:
setOptions
在接口中OptionHandler
- 参数:
options
- the list of options as an array of strings- 抛出:
Exception
- if an option is not supported
-
missingMergeTipText
Returns the tip text for this property- 返回:
- tip text for this property suitable for displaying in the explorer/experimenter gui
-
setMissingMerge
public void setMissingMerge(boolean b) distribute the counts for missing values across observed values- 参数:
b
- true=distribute missing values.
-
getMissingMerge
public boolean getMissingMerge()get whether missing values are being distributed or not- 返回:
- true if missing values are being distributed.
-
getOptions
Gets the current settings of WrapperSubsetEval.- 指定者:
getOptions
在接口中OptionHandler
- 返回:
- an array of strings suitable for passing to setOptions()
-
getCapabilities
Returns the capabilities of this evaluator.- 指定者:
getCapabilities
在接口中CapabilitiesHandler
- 覆盖:
getCapabilities
在类中ASEvaluation
- 返回:
- the capabilities of this evaluator
- 另请参阅:
-
buildEvaluator
Initializes a gain ratio attribute evaluator. Discretizes all attributes that are numeric.- 指定者:
buildEvaluator
在类中ASEvaluation
- 参数:
data
- set of instances serving as training data- 抛出:
Exception
- if the evaluator has not been generated successfully
-
evaluateAttribute
evaluates an individual attribute by measuring the gain ratio of the class given the attribute.- 指定者:
evaluateAttribute
在接口中AttributeEvaluator
- 参数:
attribute
- the index of the attribute to be evaluated- 返回:
- the gain ratio
- 抛出:
Exception
- if the attribute could not be evaluated
-
toString
Return a description of the evaluator -
getRevision
Returns the revision string.- 指定者:
getRevision
在接口中RevisionHandler
- 覆盖:
getRevision
在类中ASEvaluation
- 返回:
- the revision
-
postProcess
public int[] postProcess(int[] attributeSet) 从类复制的说明:ASEvaluation
Provides a chance for a attribute evaluator to do any special post processing of the selected attribute set.- 覆盖:
postProcess
在类中ASEvaluation
- 参数:
attributeSet
- the set of attributes found by the search- 返回:
- a possibly ranked list of postprocessed attributes
-
main
Main method.- 参数:
args
- the options -t training file
-