BayesNetGenerator

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## weka.classifiers.bayes.net
Class BayesNetGenerator

    java.lang.Object
      weka.classifiers.Classifier
          weka.classifiers.bayes.BayesNet
              weka.classifiers.bayes.net.EditableBayesNet
                  weka.classifiers.bayes.net.BayesNetGenerator

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

    public class BayesNetGenerator

extends EditableBayesNet

Bayes Network learning using various search algorithms and quality measures.
Base class for a Bayes Network classifier. Provides datastructures (network structure, conditional probability distributions, etc.) and facilities common to Bayes Network learning algorithms like K2 and B.
For more information see:
http://www.cs.waikato.ac.nz/~remco/weka.pdf

Valid options are:

     -B
      Generate network (instead of instances)

     -N <integer>
      Nr of nodes

     -A <integer>
      Nr of arcs

     -M <integer>
      Nr of instances

     -C <integer>
      Cardinality of the variables

     -S <integer>
      Seed for random number generator

     -F <file>
      The BIF file to obtain the structure from.

Version:
  $Revision: 1.14 $
Author:
  Remco Bouckaert (rrb@xm.co.nz)
See Also:
  Serialized Form

Field Summary

Fields inherited from class weka.classifiers.bayes.BayesNet
`m_Distributions, m_Instances`

Fields inherited from interface weka.core.Drawable
`BayesNet, NOT_DRAWABLE, TREE`

Constructor Summary
`BayesNetGenerator()` Constructor for BayesNetGenerator.

Method Summary
`void` | `generateInstances()` GenerateInstances generates random instances sampling from the distribution represented by the Bayes network structure.
`void` | `generateRandomNetwork()` Generate random connected Bayesian network with discrete nodes having all the same cardinality.
`void` | `generateRandomNetworkStructure(int nNodes, int nArcs)` GenerateRandomNetworkStructure generate random connected Bayesian network
`java.lang.String[]` | `getOptions()` Gets the current settings of the classifier.
`java.lang.String` | `getRevision()` Returns the revision string.
`void` | `Init(int nNodes, int nValues)` Init defines a minimal Bayes net with no arcs
`java.util.Enumeration` | `listOptions()` Returns an enumeration describing the available options
`static void` | `main(java.lang.String[] args)` Main method
`void` | `setOptions(java.lang.String[] options)` Parses a given list of options.
`java.lang.String` | `toString()` Returns either the net (if BIF format) or the generated instances

Methods inherited from class weka.classifiers.bayes.net.EditableBayesNet
`addArc, addArc, addArc, addNode, addNode, addNodeValue, alignBottom, alignLeft, alignRight, alignTop, canRedo, canUndo, centerHorizontal, centerVertical, clearUndoStack, deleteArc, deleteArc, deleteNode, deleteNode, deleteSelection, delNodeValue, getChildren, getContent, getDistribution, getDistribution, getEvidence, getMargin, getNode, getNode2, getPositionX, getPositionY, getValueName, getValues, getValues, isChanged, isSaved, lastActionMsg, layoutGraph, paste, redo, renameNodeValue, setData, setDistribution, setDistribution, setEvidence, setMargin, setNodeName, setPosition, setPosition, spaceHorizontal, spaceVertical, toXMLBIF03, toXMLBIF03, undo`

Methods inherited from class weka.classifiers.bayes.BayesNet
`BIFFileTipText, buildClassifier, buildStructure, countsForInstance, distributionForInstance, enumerateMeasures, estimateCPTs, estimatorTipText, getADTree, getBIFFile, getBIFHeader, getCapabilities, getCardinality, getDistributions, getEstimator, getMeasure, getName, getNodeName, getNodeValue, getNrOfNodes, getNrOfParents, getParent, getParentCardinality, getParentSet, getParentSets, getProbability, getSearchAlgorithm, getUseADTree, globalInfo, graph, graphType, initCPTs, initStructure, measureAICScore, measureBayesScore, measureBDeuScore, measureDivergence, measureEntropyScore, measureExtraArcs, measureMDLScore, measureMissingArcs, measureReversedArcs, partitionOptions, searchAlgorithmTipText, setBIFFile, setEstimator, setSearchAlgorithm, setUseADTree, updateClassifier, useADTreeTipText`

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

### BayesNetGenerator

    public BayesNetGenerator()

  Constructor for BayesNetGenerator.

Method Detail

### generateRandomNetwork

    public void generateRandomNetwork()
                               throws java.lang.Exception

  Generate random connected Bayesian network with discrete nodes having all the same cardinality.

  Throws:
    `java.lang.Exception` - if something goes wrong

### Init

    public void Init(int nNodes,
                     int nValues)
              throws java.lang.Exception

  Init defines a minimal Bayes net with no arcs

  Parameters:
    `nNodes` - number of nodes in the Bayes net
    `nValues` - number of values each of the nodes can take
  Throws:
    `java.lang.Exception` - if something goes wrong

### generateRandomNetworkStructure

    public void generateRandomNetworkStructure(int nNodes,
                                               int nArcs)
                                        throws java.lang.Exception

  GenerateRandomNetworkStructure generate random connected Bayesian network

  Parameters:
    `nNodes` - number of nodes in the Bayes net to generate
    `nArcs` - number of arcs to generate. Must be between nNodes - 1 and nNodes * (nNodes-1) / 2
  Throws:
    `java.lang.Exception` - if number of arcs is incorrect

### generateInstances

    public void generateInstances()
                           throws java.lang.Exception

  GenerateInstances generates random instances sampling from the distribution represented by the Bayes network structure. It assumes a Bayes network structure has been initialized

  Throws:
    `java.lang.Exception` - if something goes wrong

### toString

    public java.lang.String toString()

  Returns either the net (if BIF format) or the generated instances

  Overrides:
    `toString` in class `BayesNet`
  Returns:
    either the net or the generated instances

### listOptions

    public java.util.Enumeration listOptions()

  Returns an enumeration describing the available options

  Specified by:
    `listOptions` in interface `OptionHandler`
  Overrides:
    `listOptions` in class `BayesNet`
  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:

       -B
        Generate network (instead of instances)

       -N <integer>
        Nr of nodes

       -A <integer>
        Nr of arcs

       -M <integer>
        Nr of instances

       -C <integer>
        Cardinality of the variables

       -S <integer>
        Seed for random number generator

       -F <file>
        The BIF file to obtain the structure from.

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

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

  Specified by:
    `getRevision` in interface `RevisionHandler`
  Overrides:
    `getRevision` in class `EditableBayesNet`
  Returns:
    the revision

### main

    public static void main(java.lang.String[] args)

  Main method

  Parameters:
    `args` - the commandline parameters

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