Package weka.attributeSelection

Class ClassifierSubsetEval

  • All Implemented Interfaces:
    Serializable, ErrorBasedMeritEvaluator, SubsetEvaluator, CapabilitiesHandler, CapabilitiesIgnorer, CommandlineRunnable, OptionHandler, RevisionHandler
    public class ClassifierSubsetEval
extends HoldOutSubsetEvaluator
implements OptionHandler, ErrorBasedMeritEvaluator
    Classifier subset evaluator:

    Evaluates attribute subsets on training data or a separate hold out testing set. Uses a classifier to estimate the 'merit' of a set of attributes.

    Valid options are: 

     -B <classifier>
  class name of the classifier to use for accuracy estimation.
  Place any classifier options LAST on the command line
  following a "--". eg.:
   -B weka.classifiers.bayes.NaiveBayes ... -- -K
  (default: weka.classifiers.rules.ZeroR)
     -T
  Use the training data to estimate accuracy.
     -H <filename>
  Name of the hold out/test set to 
  estimate accuracy on.
     -percentage-split
  Perform a percentage split on the training data.
  Use in conjunction with -T.
     -P
  Split percentage to use (default = 90).
     -S
  Random seed for percentage split (default = 1).
     -E <DEFAULT|ACC|RMSE|MAE|F-MEAS|AUC|AUPRC|CORR-COEFF>
  Performance evaluation measure to use for selecting attributes.
  (Default = default: accuracy for discrete class and rmse for numeric class)
     -IRclass <label | index>
  Optional class value (label or 1-based index) to use in conjunction with
  IR statistics (f-meas, auc or auprc). Omitting this option will use
  the class-weighted average.
     
 Options specific to scheme weka.classifiers.rules.ZeroR:
 
     -output-debug-info
  If set, classifier is run in debug mode and
  may output additional info to the console
     -do-not-check-capabilities
  If set, classifier capabilities are not checked before classifier is built
  (use with caution).
     -num-decimal-places
  The number of decimal places for the output of numbers in the model (default 2).
     -batch-size
  The desired batch size for batch prediction  (default 100).
    Version:
    $Revision: 10332 $
    Author:
    Mark Hall (mhall@cs.waikato.ac.nz)
    See Also:
    Serialized Form

    • Constructor Detail

      • ClassifierSubsetEval

        public ClassifierSubsetEval()

    • Method Detail

      • globalInfo

        public String globalInfo()
        Returns a string describing this attribute evaluator
        Returns:
        a description of the evaluator suitable for displaying in the explorer/experimenter gui

      • setOptions

        public void setOptions​(String[] options)
                throws Exception
        Parses a given list of options.

        Valid options are: 

         -B <classifier>
  class name of the classifier to use for accuracy estimation.
  Place any classifier options LAST on the command line
  following a "--". eg.:
   -B weka.classifiers.bayes.NaiveBayes ... -- -K
  (default: weka.classifiers.rules.ZeroR)
         -T
  Use the training data to estimate accuracy.
         -H <filename>
  Name of the hold out/test set to 
  estimate accuracy on.
         -percentage-split
  Perform a percentage split on the training data.
  Use in conjunction with -T.
         -P
  Split percentage to use (default = 90).
         -S
  Random seed for percentage split (default = 1).
         -E <DEFAULT|ACC|RMSE|MAE|F-MEAS|AUC|AUPRC|CORR-COEFF>
  Performance evaluation measure to use for selecting attributes.
  (Default = default: accuracy for discrete class and rmse for numeric class)
         -IRclass <label | index>
  Optional class value (label or 1-based index) to use in conjunction with
  IR statistics (f-meas, auc or auprc). Omitting this option will use
  the class-weighted average.
         
 Options specific to scheme weka.classifiers.rules.ZeroR:
 
         -output-debug-info
  If set, classifier is run in debug mode and
  may output additional info to the console
         -do-not-check-capabilities
  If set, classifier capabilities are not checked before classifier is built
  (use with caution).
         -num-decimal-places
  The number of decimal places for the output of numbers in the model (default 2).
         -batch-size
  The desired batch size for batch prediction  (default 100).
        Specified by:
        setOptions in interface OptionHandler
        Overrides:
        setOptions in class ASEvaluation
        Parameters:
        options - the list of options as an array of strings
        Throws:
        Exception - if an option is not supported

      • seedTipText

        public String seedTipText()
        Returns the tip text for this property
        Returns:
        tip text for this property suitable for displaying in the explorer/experimenter gui

      • setSeed

        public void setSeed​(int s)
        Set the random seed used to randomize the data before performing a percentage split
        Parameters:
        s - the seed to use

      • getSeed

        public int getSeed()
        Get the random seed used to randomize the data before performing a percentage split
        Returns:
        the seed to use

      • usePercentageSplitTipText

        public String usePercentageSplitTipText()
        Returns the tip text for this property
        Returns:
        tip text for this property suitable for displaying in the explorer/experimenter gui

      • setUsePercentageSplit

        public void setUsePercentageSplit​(boolean p)
        Set whether to perform a percentage split on the training data for evaluation
        Parameters:
        p - true if a percentage split is to be performed

      • getUsePercentageSplit

        public boolean getUsePercentageSplit()
        Get whether to perform a percentage split on the training data for evaluation
        Returns:
        true if a percentage split is to be performed

      • splitPercentTipText

        public String splitPercentTipText()
        Returns the tip text for this property
        Returns:
        tip text for this property suitable for displaying in the explorer/experimenter gui

      • setSplitPercent

        public void setSplitPercent​(String sp)
        Set the split percentage to use
        Parameters:
        sp - the split percentage to use

      • getSplitPercent

        public String getSplitPercent()
        Get the split percentage to use
        Returns:
        the split percentage to use

      • setIRClassValue

        public void setIRClassValue​(String val)
        Set the class value (label or index) to use with IR metric evaluation of subsets. Leaving this unset will result in the class weighted average for the IR metric being used.
        Parameters:
        val - the class label or 1-based index of the class label to use when evaluating subsets with an IR metric

      • getIRClassValue

        public String getIRClassValue()
        Get the class value (label or index) to use with IR metric evaluation of subsets. Leaving this unset will result in the class weighted average for the IR metric being used.
        Returns:
        the class label or 1-based index of the class label to use when evaluating subsets with an IR metric

      • IRClassValueTipText

        public String IRClassValueTipText()
        Returns the tip text for this property
        Returns:
        tip text for this property suitable for displaying in the explorer/experimenter gui

      • evaluationMeasureTipText

        public String evaluationMeasureTipText()
        Returns the tip text for this property
        Returns:
        tip text for this property suitable for displaying in the explorer/experimenter gui

      • getEvaluationMeasure

        public SelectedTag getEvaluationMeasure()
        Gets the currently set performance evaluation measure used for selecting attributes for the decision table
        Returns:
        the performance evaluation measure

      • setEvaluationMeasure

        public void setEvaluationMeasure​(SelectedTag newMethod)
        Sets the performance evaluation measure to use for selecting attributes for the decision table
        Parameters:
        newMethod - the new performance evaluation metric to use

      • classifierTipText

        public String classifierTipText()
        Returns the tip text for this property
        Returns:
        tip text for this property suitable for displaying in the explorer/experimenter gui

      • setClassifier

        public void setClassifier​(Classifier newClassifier)
        Set the classifier to use for accuracy estimation
        Parameters:
        newClassifier - the Classifier to use.

      • getClassifier

        public Classifier getClassifier()
        Get the classifier used as the base learner.
        Returns:
        the classifier used as the classifier

      • holdOutFileTipText

        public String holdOutFileTipText()
        Returns the tip text for this property
        Returns:
        tip text for this property suitable for displaying in the explorer/experimenter gui

      • getHoldOutFile

        public File getHoldOutFile()
        Gets the file that holds hold out/test instances.
        Returns:
        File that contains hold out instances

      • setHoldOutFile

        public void setHoldOutFile​(File h)
        Set the file that contains hold out/test instances
        Parameters:
        h - the hold out file

      • useTrainingTipText

        public String useTrainingTipText()
        Returns the tip text for this property
        Returns:
        tip text for this property suitable for displaying in the explorer/experimenter gui

      • getUseTraining

        public boolean getUseTraining()
        Get if training data is to be used instead of hold out/test data
        Returns:
        true if training data is to be used instead of hold out data

      • setUseTraining

        public void setUseTraining​(boolean t)
        Set if training data is to be used instead of hold out/test data
        Parameters:
        t - true if training data is to be used instead of hold out data

      • getOptions

        public String[] getOptions()
        Gets the current settings of ClassifierSubsetEval
        Specified by:
        getOptions in interface OptionHandler
        Overrides:
        getOptions in class ASEvaluation
        Returns:
        an array of strings suitable for passing to setOptions()

      • buildEvaluator

        public void buildEvaluator​(Instances data)
                    throws Exception
        Generates a attribute evaluator. Has to initialize all fields of the evaluator that are not being set via options.
        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 error rate
        Throws:
        Exception - if the subset could not be evaluated

      • evaluateSubset

        public double evaluateSubset​(BitSet subset,
                             Instances holdOut)
                      throws Exception
        Evaluates a subset of attributes with respect to a set of instances. Calling this function overrides any test/hold out instances set from setHoldOutFile.
        Specified by:
        evaluateSubset in class HoldOutSubsetEvaluator
        Parameters:
        subset - a bitset representing the attribute subset to be evaluated
        holdOut - a set of instances (possibly separate and distinct from those use to build/train the evaluator) with which to evaluate the merit of the subset
        Returns:
        the "merit" of the subset on the holdOut data
        Throws:
        Exception - if the subset cannot be evaluated

      • evaluateSubset

        public double evaluateSubset​(BitSet subset,
                             Instance holdOut,
                             boolean retrain)
                      throws Exception
        Evaluates a subset of attributes with respect to a single instance. Calling this function overides any hold out/test instances set through setHoldOutFile.
        Specified by:
        evaluateSubset in class HoldOutSubsetEvaluator
        Parameters:
        subset - a bitset representing the attribute subset to be evaluated
        holdOut - a single instance (possibly not one of those used to build/train the evaluator) with which to evaluate the merit of the subset
        retrain - true if the classifier should be retrained with respect to the new subset before testing on the holdOut instance.
        Returns:
        the "merit" of the subset on the holdOut instance
        Throws:
        Exception - if the subset cannot be evaluated

      • toString

        public String toString()
        Returns a string describing classifierSubsetEval
        Overrides:
        toString in class Object
        Returns:
        the description as a string

      • main

        public static void main​(String[] args)
        Main method for testing this class.
        Parameters:
        args - the options