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## weka.classifiers.bayes
Class NaiveBayes

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

All Implemented Interfaces:
  java.io.Serializable, java.lang.Cloneable, CapabilitiesHandler, OptionHandler, RevisionHandler, TechnicalInformationHandler, WeightedInstancesHandler

Direct Known Subclasses:
  NaiveBayesUpdateable

    public class NaiveBayes

extends Classifier
implements OptionHandler, WeightedInstancesHandler, TechnicalInformationHandler

Class for a Naive Bayes classifier using estimator classes. Numeric estimator precision values are chosen based on analysis of the training data. For this reason, the classifier is not an UpdateableClassifier (which in typical usage are initialized with zero training instances) -- if you need the UpdateableClassifier functionality, use the NaiveBayesUpdateable classifier. The NaiveBayesUpdateable classifier will use a default precision of 0.1 for numeric attributes when buildClassifier is called with zero training instances.
For more information on Naive Bayes classifiers, see
George H. John, Pat Langley: Estimating Continuous Distributions in Bayesian Classifiers. In: Eleventh Conference on Uncertainty in Artificial Intelligence, San Mateo, 338-345, 1995.

BibTeX:

     @inproceedings{John1995,
        address = {San Mateo},
        author = {George H. John and Pat Langley},
        booktitle = {Eleventh Conference on Uncertainty in Artificial Intelligence},
        pages = {338-345},
        publisher = {Morgan Kaufmann},
        title = {Estimating Continuous Distributions in Bayesian Classifiers},
        year = {1995}
     }

Valid options are:

     -K
      Use kernel density estimator rather than normal
      distribution for numeric attributes

     -D
      Use supervised discretization to process numeric attributes

     -O
      Display model in old format (good when there are many classes)

Version:
  $Revision: 5516 $
Author:
  Len Trigg (trigg@cs.waikato.ac.nz), Eibe Frank (eibe@cs.waikato.ac.nz)
See Also:
  Serialized Form

Constructor Summary
`NaiveBayes()`

Method Summary
`void` | `buildClassifier(Instances instances)` Generates the classifier.
`java.lang.String` | `displayModelInOldFormatTipText()` Returns the tip text for this property
`double[]` | `distributionForInstance(Instance instance)` Calculates the class membership probabilities for the given test instance.
`Capabilities` | `getCapabilities()` Returns default capabilities of the classifier.
`boolean` | `getDisplayModelInOldFormat()` Get whether to display model output in the old, original format.
`java.lang.String[]` | `getOptions()` Gets the current settings of the classifier.
`java.lang.String` | `getRevision()` Returns the revision string.
`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.
`boolean` | `getUseKernelEstimator()` Gets if kernel estimator is being used.
`boolean` | `getUseSupervisedDiscretization()` Get whether supervised discretization is to be used.
`java.lang.String` | `globalInfo()` Returns a string describing this classifier
`java.util.Enumeration` | `listOptions()` Returns an enumeration describing the available options.
`static void` | `main(java.lang.String[] argv)` Main method for testing this class.
`void` | `setDisplayModelInOldFormat(boolean d)` Set whether to display model output in the old, original format.
`void` | `setOptions(java.lang.String[] options)` Parses a given list of options.
`void` | `setUseKernelEstimator(boolean v)` Sets if kernel estimator is to be used.
`void` | `setUseSupervisedDiscretization(boolean newblah)` Set whether supervised discretization is to be used.
`java.lang.String` | `toString()` Returns a description of the classifier.
`void` | `updateClassifier(Instance instance)` Updates the classifier with the given instance.
`java.lang.String` | `useKernelEstimatorTipText()` Returns the tip text for this property
`java.lang.String` | `useSupervisedDiscretizationTipText()` Returns the tip text for this property

Methods inherited from class weka.classifiers.Classifier
`classifyInstance, debugTipText, forName, getDebug, makeCopies, makeCopy, setDebug`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### NaiveBayes

    public NaiveBayes()

Method Detail

### globalInfo

    public java.lang.String globalInfo()

  Returns a string describing this classifier

  Returns:
    a description of the classifier 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 `Classifier`
  Returns:
    the capabilities of this classifier
  See Also:
    `Capabilities`

### buildClassifier

    public void buildClassifier(Instances instances)
                         throws java.lang.Exception

  Generates the classifier.

  Specified by:
    `buildClassifier` in class `Classifier`
  Parameters:
    `instances` - set of instances serving as training data
  Throws:
    `java.lang.Exception` - if the classifier has not been generated successfully

### updateClassifier

    public void updateClassifier(Instance instance)
                          throws java.lang.Exception

  Updates the classifier with the given instance.

  Parameters:
    `instance` - the new training instance to include in the model
  Throws:
    `java.lang.Exception` - if the instance could not be incorporated in the model.

### distributionForInstance

    public double[] distributionForInstance(Instance instance)
                                     throws java.lang.Exception

  Calculates the class membership probabilities for the given test instance.

  Overrides:
    `distributionForInstance` in class `Classifier`
  Parameters:
    `instance` - the instance to be classified
  Returns:
    predicted class probability distribution
  Throws:
    `java.lang.Exception` - if there is a problem generating the prediction

### listOptions

    public java.util.Enumeration listOptions()

  Returns an enumeration describing the available options.

  Specified by:
    `listOptions` in interface `OptionHandler`
  Overrides:
    `listOptions` in class `Classifier`
  Returns:
    an enumeration of all the available options.

### setOptions

    public void setOptions(java.lang.String[] options)
                    throws java.lang.Exception

  Parses a given list of options.

  Valid options are:

       -K
        Use kernel density estimator rather than normal
        distribution for numeric attributes

       -D
        Use supervised discretization to process numeric attributes

       -O
        Display model in old format (good when there are many classes)

  Specified by:
    `setOptions` in interface `OptionHandler`
  Overrides:
    `setOptions` in class `Classifier`
  Parameters:
    `options` - the list of options as an array of strings
  Throws:
    `java.lang.Exception` - if an option is not supported

### getOptions

    public java.lang.String[] getOptions()

  Gets the current settings of the classifier.

  Specified by:
    `getOptions` in interface `OptionHandler`
  Overrides:
    `getOptions` in class `Classifier`
  Returns:
    an array of strings suitable for passing to setOptions

### toString

    public java.lang.String toString()

  Returns a description of the classifier.

  Overrides:
    `toString` in class `java.lang.Object`
  Returns:
    a description of the classifier as a string.

### useKernelEstimatorTipText

    public java.lang.String useKernelEstimatorTipText()

  Returns the tip text for this property

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

### getUseKernelEstimator

    public boolean getUseKernelEstimator()

  Gets if kernel estimator is being used.

  Returns:
    Value of m_UseKernelEstimatory.

### setUseKernelEstimator

    public void setUseKernelEstimator(boolean v)

  Sets if kernel estimator is to be used.

  Parameters:
    `v` - Value to assign to m_UseKernelEstimatory.

### useSupervisedDiscretizationTipText

    public java.lang.String useSupervisedDiscretizationTipText()

  Returns the tip text for this property

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

### getUseSupervisedDiscretization

    public boolean getUseSupervisedDiscretization()

  Get whether supervised discretization is to be used.

  Returns:
    true if supervised discretization is to be used.

### setUseSupervisedDiscretization

    public void setUseSupervisedDiscretization(boolean newblah)

  Set whether supervised discretization is to be used.

  Parameters:
    `newblah` - true if supervised discretization is to be used.

### displayModelInOldFormatTipText

    public java.lang.String displayModelInOldFormatTipText()

  Returns the tip text for this property

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

### setDisplayModelInOldFormat

    public void setDisplayModelInOldFormat(boolean d)

  Set whether to display model output in the old, original format.

  Parameters:
    `d` - true if model ouput is to be shown in the old format

### getDisplayModelInOldFormat

    public boolean getDisplayModelInOldFormat()

  Get whether to display model output in the old, original format.

  Returns:
    true if model ouput is to be shown in the old format

### getRevision

    public java.lang.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(java.lang.String[] argv)

  Main method for testing this class.

  Parameters:
    `argv` - the options

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