Package weka.classifiers.meta

Class OrdinalClassClassifier

java.lang.Object
weka.classifiers.Classifier
weka.classifiers.SingleClassifierEnhancer
weka.classifiers.meta.OrdinalClassClassifier
All Implemented Interfaces:
Serializable, Cloneable, CapabilitiesHandler, OptionHandler, RevisionHandler, TechnicalInformationHandler
public class OrdinalClassClassifier extends SingleClassifierEnhancer implements OptionHandler, TechnicalInformationHandler
Meta classifier that allows standard classification algorithms to be applied to ordinal class problems.

For more information see:

Eibe Frank, Mark Hall: A Simple Approach to Ordinal Classification. In: 12th European Conference on Machine Learning, 145-156, 2001.

BibTeX: 

 @inproceedings{Frank2001,
    author = {Eibe Frank and Mark Hall},
    booktitle = {12th European Conference on Machine Learning},
    pages = {145-156},
    publisher = {Springer},
    title = {A Simple Approach to Ordinal Classification},
    year = {2001}
 }

Valid options are: 

 -D
  If set, classifier is run in debug mode and
  may output additional info to the console
 -W
  Full name of base classifier.
  (default: weka.classifiers.trees.J48)
 
 Options specific to classifier weka.classifiers.trees.J48:
 
 -U
  Use unpruned tree.
 -C <pruning confidence>
  Set confidence threshold for pruning.
  (default 0.25)
 -M <minimum number of instances>
  Set minimum number of instances per leaf.
  (default 2)
 -R
  Use reduced error pruning.
 -N <number of folds>
  Set number of folds for reduced error
  pruning. One fold is used as pruning set.
  (default 3)
 -B
  Use binary splits only.
 -S
  Don't perform subtree raising.
 -L
  Do not clean up after the tree has been built.
 -A
  Laplace smoothing for predicted probabilities.
 -Q <seed>
  Seed for random data shuffling (default 1).
Version:
$Revision 1.0 $
Author:
Mark Hall
See Also:

  • Constructor Details

    • OrdinalClassClassifier

      public OrdinalClassClassifier()
      Default constructor.

  • Method Details

    • 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

    • getTechnicalInformation

      public TechnicalInformation getTechnicalInformation()
      Returns an instance of a TechnicalInformation object, containing detailed information about the technical background of this class, e.g., paper reference or book this class is based on.
      Specified by:
      getTechnicalInformation in interface TechnicalInformationHandler
      Returns:
      the technical information about this class

    • getCapabilities

      public Capabilities getCapabilities()
      Returns default capabilities of the classifier.
      Specified by:
      getCapabilities in interface CapabilitiesHandler
      Overrides:
      getCapabilities in class SingleClassifierEnhancer
      Returns:
      the capabilities of this classifier
      See Also:

    • buildClassifier

      public void buildClassifier(Instances insts) throws Exception
      Builds the classifiers.
      Specified by:
      buildClassifier in class Classifier
      Parameters:
      insts - the training data.
      Throws:
      Exception - if a classifier can't be built

    • distributionForInstance

      public double[] distributionForInstance(Instance inst) throws Exception
      Returns the distribution for an instance.
      Overrides:
      distributionForInstance in class Classifier
      Parameters:
      inst - the instance to compute the distribution for
      Returns:
      the class distribution for the given instance
      Throws:
      Exception - if the distribution can't be computed successfully

    • listOptions

      public Enumeration listOptions()
      Returns an enumeration describing the available options.
      Specified by:
      listOptions in interface OptionHandler
      Overrides:
      listOptions in class SingleClassifierEnhancer
      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: 

       -D
  If set, classifier is run in debug mode and
  may output additional info to the console
       -W
  Full name of base classifier.
  (default: weka.classifiers.trees.J48)
       
 Options specific to classifier weka.classifiers.trees.J48:
 
       -U
  Use unpruned tree.
       -C <pruning confidence>
  Set confidence threshold for pruning.
  (default 0.25)
       -M <minimum number of instances>
  Set minimum number of instances per leaf.
  (default 2)
       -R
  Use reduced error pruning.
       -N <number of folds>
  Set number of folds for reduced error
  pruning. One fold is used as pruning set.
  (default 3)
       -B
  Use binary splits only.
       -S
  Don't perform subtree raising.
       -L
  Do not clean up after the tree has been built.
       -A
  Laplace smoothing for predicted probabilities.
       -Q <seed>
  Seed for random data shuffling (default 1).
      Specified by:
      setOptions in interface OptionHandler
      Overrides:
      setOptions in class SingleClassifierEnhancer
      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 Classifier.
      Specified by:
      getOptions in interface OptionHandler
      Overrides:
      getOptions in class SingleClassifierEnhancer
      Returns:
      an array of strings suitable for passing to setOptions

    • toString

      public String toString()
      Prints the classifiers.
      Overrides:
      toString in class Object
      Returns:
      a string representation of this classifier

    • getRevision

      public String getRevision()
      Returns the revision string.
      Specified by:
      getRevision in interface RevisionHandler
      Overrides:
      getRevision in class Classifier
      Returns:
      the revision

    • main

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