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Java Source Code / Java Documentation » Science » weka » weka.classifiers.bayes 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   weka.classifiers.Classifier
      weka.classifiers.bayes.ComplementNaiveBayes

ComplementNaiveBayes
public class ComplementNaiveBayes extends Classifier implements OptionHandler,WeightedInstancesHandler,TechnicalInformationHandler(Code)
Class for building and using a Complement class Naive Bayes classifier.

For more information see,

Jason D. Rennie, Lawrence Shih, Jaime Teevan, David R. Karger: Tackling the Poor Assumptions of Naive Bayes Text Classifiers. In: ICML, 616-623, 2003.

P.S.: TF, IDF and length normalization transforms, as described in the paper, can be performed through weka.filters.unsupervised.StringToWordVector.

BibTeX:

 @inproceedings{Rennie2003,
 author = {Jason D. Rennie and Lawrence Shih and Jaime Teevan and David R. Karger},
 booktitle = {ICML},
 pages = {616-623},
 publisher = {AAAI Press},
 title = {Tackling the Poor Assumptions of Naive Bayes Text Classifiers},
 year = {2003}
 }
 

Valid options are:

 -N
 Normalize the word weights for each class
 
 -S
 Smoothing value to avoid zero WordGivenClass probabilities (default=1.0).
 

author:
   Ashraf M. Kibriya (amk14@cs.waikato.ac.nz)
version:
   $Revision: 1.8 $


Field Summary
final static  longserialVersionUID
    


Method Summary
public  voidbuildClassifier(Instances instances)
     Generates the classifier.
public  doubleclassifyInstance(Instance instance)
     Classifies a given instance.
public  CapabilitiesgetCapabilities()
     Returns default capabilities of the classifier.
public  booleangetNormalizeWordWeights()
    
public  String[]getOptions()
     Gets the current settings of the classifier.
public  doublegetSmoothingParameter()
     Gets the smoothing value to be used to avoid zero WordGivenClass probabilities.
public  TechnicalInformationgetTechnicalInformation()
     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.
public  StringglobalInfo()
    
public  java.util.EnumerationlistOptions()
     Returns an enumeration describing the available options.
public static  voidmain(String[] argv)
     Main method for testing this class.
public  StringnormalizeWordWeightsTipText()
    
public  voidsetNormalizeWordWeights(boolean doNormalize)
    
public  voidsetOptions(String[] options)
     Parses a given list of options.
public  voidsetSmoothingParameter(double val)
    
public  StringsmoothingParameterTipText()
    
public  StringtoString()
     Prints out the internal model built by the classifier.

Field Detail
serialVersionUID
final static long serialVersionUID(Code)
for serialization





Method Detail
buildClassifier
public void buildClassifier(Instances instances) throws Exception(Code)
Generates the classifier.
Parameters:
  instances - set of instances serving as training data
throws:
  Exception - if the classifier has not been built successfully



classifyInstance
public double classifyInstance(Instance instance) throws Exception(Code)
Classifies a given instance.

The classification rule is:
MinC(forAllWords(ti*Wci))
where
ti is the frequency of word i in the given instance
Wci is the weight of word i in Class c.

For more information see section 4.4 of the paper mentioned above in the classifiers description.
Parameters:
  instance - the instance to classify the index of the class the instance is most likely to belong.
throws:
  Exception - if the classifier has not been built yet.




getCapabilities
public Capabilities getCapabilities()(Code)
Returns default capabilities of the classifier. the capabilities of this classifier



getNormalizeWordWeights
public boolean getNormalizeWordWeights()(Code)
Returns true if the word weights for each class are to be normalized true if the word weights are normalized



getOptions
public String[] getOptions()(Code)
Gets the current settings of the classifier. an array of strings suitable for passing to setOptions



getSmoothingParameter
public double getSmoothingParameter()(Code)
Gets the smoothing value to be used to avoid zero WordGivenClass probabilities. the smoothing value



getTechnicalInformation
public TechnicalInformation getTechnicalInformation()(Code)
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. the technical information about this class



globalInfo
public String globalInfo()(Code)
Returns a string describing this classifier a description of the classifier suitable fordisplaying in the explorer/experimenter gui



listOptions
public java.util.Enumeration listOptions()(Code)
Returns an enumeration describing the available options. an enumeration of all the available options.



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



normalizeWordWeightsTipText
public String normalizeWordWeightsTipText()(Code)
Returns the tip text for this property tip text for this property suitable fordisplaying in the explorer/experimenter gui



setNormalizeWordWeights
public void setNormalizeWordWeights(boolean doNormalize)(Code)
Sets whether if the word weights for each class should be normalized
Parameters:
  doNormalize - whether the word weights are to be normalized



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

Valid options are:

 -N
 Normalize the word weights for each class
 
 -S
 Smoothing value to avoid zero WordGivenClass probabilities (default=1.0).
 

Parameters:
  options - the list of options as an array of strings
throws:
  Exception - if an option is not supported



setSmoothingParameter
public void setSmoothingParameter(double val)(Code)
Sets the smoothing value used to avoid zero WordGivenClass probabilities
Parameters:
  val - the new smooting value



smoothingParameterTipText
public String smoothingParameterTipText()(Code)
Returns the tip text for this property tip text for this property suitable fordisplaying in the explorer/experimenter gui



toString
public String toString()(Code)
Prints out the internal model built by the classifier. In this case it prints out the word weights calculated when building the classifier.



Fields inherited from weka.classifiers.Classifier
protected boolean m_Debug(Code)(Java Doc)

Methods inherited from weka.classifiers.Classifier
abstract public void buildClassifier(Instances data) throws Exception(Code)(Java Doc)
public double classifyInstance(Instance instance) throws Exception(Code)(Java Doc)
public String debugTipText()(Code)(Java Doc)
public double[] distributionForInstance(Instance instance) throws Exception(Code)(Java Doc)
public static Classifier forName(String classifierName, String[] options) throws Exception(Code)(Java Doc)
public Capabilities getCapabilities()(Code)(Java Doc)
public boolean getDebug()(Code)(Java Doc)
public String[] getOptions()(Code)(Java Doc)
public Enumeration listOptions()(Code)(Java Doc)
public static Classifier[] makeCopies(Classifier model, int num) throws Exception(Code)(Java Doc)
public static Classifier makeCopy(Classifier model) throws Exception(Code)(Java Doc)
protected static void runClassifier(Classifier classifier, String[] options)(Code)(Java Doc)
public void setDebug(boolean debug)(Code)(Java Doc)
public void setOptions(String[] options) throws Exception(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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