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## weka.classifiers.bayes.net.search.global
Class GlobalScoreSearchAlgorithm

    java.lang.Object
      weka.classifiers.bayes.net.search.SearchAlgorithm
          weka.classifiers.bayes.net.search.global.GlobalScoreSearchAlgorithm

All Implemented Interfaces:
  java.io.Serializable, OptionHandler, RevisionHandler

Direct Known Subclasses:
  GeneticSearch, HillClimber, K2, SimulatedAnnealing, TAN

    public class GlobalScoreSearchAlgorithm

extends SearchAlgorithm

This Bayes Network learning algorithm uses cross validation to estimate classification accuracy.

Valid options are:

     -mbc
      Applies a Markov Blanket correction to the network structure,
      after a network structure is learned. This ensures that all
      nodes in the network are part of the Markov blanket of the
      classifier node.

     -S [LOO-CV|k-Fold-CV|Cumulative-CV]
      Score type (LOO-CV,k-Fold-CV,Cumulative-CV)

     -Q
      Use probabilistic or 0/1 scoring.
      (default probabilistic scoring)

Version:
  $Revision: 1.10 $
Author:
  Remco Bouckaert
See Also:
  Serialized Form

Field Summary
`static Tag[]` | `TAGS_CV_TYPE` the score types

Constructor Summary
`GlobalScoreSearchAlgorithm()`

Method Summary
`double` | `calcScore(BayesNet bayesNet)` performCV returns the accuracy calculated using cross validation.
`double` | `calcScoreWithExtraParent(int nNode, int nCandidateParent)` Calc Node Score With Added Parent
`double` | `calcScoreWithMissingParent(int nNode, int nCandidateParent)` Calc Node Score With Parent Deleted
`double` | `calcScoreWithReversedParent(int nNode, int nCandidateParent)` Calc Node Score With Arrow reversed
`double` | `cumulativeCV(BayesNet bayesNet)` CumulativeCV returns the accuracy calculated using cumulative cross validation.
`java.lang.String` | `CVTypeTipText()`
`SelectedTag` | `getCVType()` get cross validation strategy to be used in searching for networks.
`boolean` | `getMarkovBlanketClassifier()`
`java.lang.String[]` | `getOptions()` Gets the current settings of the search algorithm.
`java.lang.String` | `getRevision()` Returns the revision string.
`boolean` | `getUseProb()`
`java.lang.String` | `globalInfo()` This will return a string describing the search algorithm.
`double` | `kFoldCV(BayesNet bayesNet, int nNrOfFolds)` kFoldCV uses k-fold cross validation to measure the accuracy of a Bayes network classifier.
`double` | `leaveOneOutCV(BayesNet bayesNet)` LeaveOneOutCV returns the accuracy calculated using Leave One Out cross validation.
`java.util.Enumeration` | `listOptions()` Returns an enumeration describing the available options
`java.lang.String` | `markovBlanketClassifierTipText()`
`void` | `setCVType(SelectedTag newCVType)` set cross validation strategy to be used in searching for networks.
`void` | `setMarkovBlanketClassifier(boolean bMarkovBlanketClassifier)`
`void` | `setOptions(java.lang.String[] options)` Parses a given list of options.
`void` | `setUseProb(boolean useProb)`
`java.lang.String` | `useProbTipText()`

Methods inherited from class weka.classifiers.bayes.net.search.SearchAlgorithm
`buildStructure, initAsNaiveBayesTipText, maxNrOfParentsTipText, toString`

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

Field Detail

### TAGS_CV_TYPE

    public static final Tag[] TAGS_CV_TYPE

  the score types

Constructor Detail

### GlobalScoreSearchAlgorithm

    public GlobalScoreSearchAlgorithm()

Method Detail

### calcScore

    public double calcScore(BayesNet bayesNet)
                     throws java.lang.Exception

  performCV returns the accuracy calculated using cross validation. The dataset used is m_Instances associated with the Bayes Network.

  Parameters:
    `bayesNet` - : Bayes Network containing structure to evaluate
  Returns:
    accuracy (in interval 0..1) measured using cv.
  Throws:
    `java.lang.Exception` - whn m_nCVType is invalided + exceptions passed on by updateClassifier

### calcScoreWithExtraParent

    public double calcScoreWithExtraParent(int nNode,
                                           int nCandidateParent)
                                    throws java.lang.Exception

  Calc Node Score With Added Parent

  Parameters:
    `nNode` - node for which the score is calculate
    `nCandidateParent` - candidate parent to add to the existing parent set
  Returns:
    log score
  Throws:
    `java.lang.Exception` - if something goes wrong

### calcScoreWithMissingParent

    public double calcScoreWithMissingParent(int nNode,
                                             int nCandidateParent)
                                      throws java.lang.Exception

  Calc Node Score With Parent Deleted

  Parameters:
    `nNode` - node for which the score is calculate
    `nCandidateParent` - candidate parent to delete from the existing parent set
  Returns:
    log score
  Throws:
    `java.lang.Exception` - if something goes wrong

### calcScoreWithReversedParent

    public double calcScoreWithReversedParent(int nNode,
                                              int nCandidateParent)
                                       throws java.lang.Exception

  Calc Node Score With Arrow reversed

  Parameters:
    `nNode` - node for which the score is calculate
    `nCandidateParent` - candidate parent to delete from the existing parent set
  Returns:
    log score
  Throws:
    `java.lang.Exception` - if something goes wrong

### leaveOneOutCV

    public double leaveOneOutCV(BayesNet bayesNet)
                         throws java.lang.Exception

  LeaveOneOutCV returns the accuracy calculated using Leave One Out cross validation. The dataset used is m_Instances associated with the Bayes Network.

  Parameters:
    `bayesNet` - : Bayes Network containing structure to evaluate
  Returns:
    accuracy (in interval 0..1) measured using leave one out cv.
  Throws:
    `java.lang.Exception` - passed on by updateClassifier

### cumulativeCV

    public double cumulativeCV(BayesNet bayesNet)
                        throws java.lang.Exception

  CumulativeCV returns the accuracy calculated using cumulative cross validation. The idea is to run through the data set and try to classify each of the instances based on the previously seen data. The data set used is m_Instances associated with the Bayes Network.

  Parameters:
    `bayesNet` - : Bayes Network containing structure to evaluate
  Returns:
    accuracy (in interval 0..1) measured using leave one out cv.
  Throws:
    `java.lang.Exception` - passed on by updateClassifier

### kFoldCV

    public double kFoldCV(BayesNet bayesNet,
                          int nNrOfFolds)
                   throws java.lang.Exception

  kFoldCV uses k-fold cross validation to measure the accuracy of a Bayes network classifier.

  Parameters:
    `bayesNet` - : Bayes Network containing structure to evaluate
    `nNrOfFolds` - : the number of folds k to perform k-fold cv
  Returns:
    accuracy (in interval 0..1) measured using leave one out cv.
  Throws:
    `java.lang.Exception` - passed on by updateClassifier

### getUseProb

    public boolean getUseProb()

  Returns:
    use probabilities or not in accuracy estimate

### setUseProb

    public void setUseProb(boolean useProb)

  Parameters:
    `useProb` - : use probabilities or not in accuracy estimate

### setCVType

    public void setCVType(SelectedTag newCVType)

  set cross validation strategy to be used in searching for networks.

  Parameters:
    `newCVType` - : cross validation strategy

### getCVType

    public SelectedTag getCVType()

  get cross validation strategy to be used in searching for networks.

  Returns:
    cross validation strategy

### setMarkovBlanketClassifier

    public void setMarkovBlanketClassifier(boolean bMarkovBlanketClassifier)

  Parameters:
    `bMarkovBlanketClassifier` -

### getMarkovBlanketClassifier

    public boolean getMarkovBlanketClassifier()

  Returns:

### listOptions

    public java.util.Enumeration listOptions()

  Returns an enumeration describing the available options

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

       -mbc
        Applies a Markov Blanket correction to the network structure,
        after a network structure is learned. This ensures that all
        nodes in the network are part of the Markov blanket of the
        classifier node.

       -S [LOO-CV|k-Fold-CV|Cumulative-CV]
        Score type (LOO-CV,k-Fold-CV,Cumulative-CV)

       -Q
        Use probabilistic or 0/1 scoring.
        (default probabilistic scoring)

  Specified by:
    `setOptions` in interface `OptionHandler`
  Overrides:
    `setOptions` in class `SearchAlgorithm`
  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 search algorithm.

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

### CVTypeTipText

    public java.lang.String CVTypeTipText()

  Returns:
    a string to describe the CVType option.

### useProbTipText

    public java.lang.String useProbTipText()

  Returns:
    a string to describe the UseProb option.

### globalInfo

    public java.lang.String globalInfo()

  This will return a string describing the search algorithm.

  Returns:
    The string.

### markovBlanketClassifierTipText

    public java.lang.String markovBlanketClassifierTipText()

  Returns:
    a string to describe the MarkovBlanketClassifier option.

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

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

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