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## weka.classifiers.meta
Class CVParameterSelection

    java.lang.Object
      weka.classifiers.Classifier
          weka.classifiers.SingleClassifierEnhancer
              weka.classifiers.RandomizableSingleClassifierEnhancer
                  weka.classifiers.meta.CVParameterSelection

All Implemented Interfaces:
  java.io.Serializable, java.lang.Cloneable, CapabilitiesHandler, Drawable, OptionHandler, Randomizable, RevisionHandler, Summarizable, TechnicalInformationHandler

    public class CVParameterSelection

extends RandomizableSingleClassifierEnhancer
implements Drawable, Summarizable, TechnicalInformationHandler

Class for performing parameter selection by cross-validation for any classifier.
For more information, see:
R. Kohavi (1995). Wrappers for Performance Enhancement and Oblivious Decision Graphs. Department of Computer Science, Stanford University.

BibTeX:

     @phdthesis{Kohavi1995,
        address = {Department of Computer Science, Stanford University},
        author = {R. Kohavi},
        school = {Stanford University},
        title = {Wrappers for Performance Enhancement and Oblivious Decision Graphs},
        year = {1995}
     }

Valid options are:

     -X <number of folds>
      Number of folds used for cross validation (default 10).

     -P <classifier parameter>
      Classifier parameter options.
      eg: "N 1 5 10" Sets an optimisation parameter for the
      classifier with name -N, with lower bound 1, upper bound
      5, and 10 optimisation steps. The upper bound may be the
      character 'A' or 'I' to substitute the number of
      attributes or instances in the training data,
      respectively. This parameter may be supplied more than
      once to optimise over several classifier options
      simultaneously.

     -S <num>
      Random number seed.
      (default 1)

     -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.rules.ZeroR)

     Options specific to classifier weka.classifiers.rules.ZeroR:

     -D
      If set, classifier is run in debug mode and
      may output additional info to the console

Options after -- are passed to the designated sub-classifier.

Version:
  $Revision: 8180 $
Author:
  Len Trigg (trigg@cs.waikato.ac.nz)
See Also:
  Serialized Form

Field Summary

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

Constructor Summary
`CVParameterSelection()`

Method Summary
`void` | `addCVParameter(java.lang.String cvParam)` Adds a scheme parameter to the list of parameters to be set by cross-validation
`void` | `buildClassifier(Instances instances)` Generates the classifier.
`java.lang.String` | `CVParametersTipText()` Returns the tip text for this property
`double[]` | `distributionForInstance(Instance instance)` Predicts the class distribution for the given test instance.
`java.lang.String[]` | `getBestClassifierOptions()` Returns (a copy of) the best options found for the classifier.
`Capabilities` | `getCapabilities()` Returns default capabilities of the classifier.
`java.lang.String` | `getCVParameter(int index)` Gets the scheme paramter with the given index.
`java.lang.Object[]` | `getCVParameters()` Get method for CVParameters.
`int` | `getNumFolds()` Gets the number of folds for the cross-validation.
`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.
`java.lang.String` | `globalInfo()` Returns a string describing this classifier
`java.lang.String` | `graph()` Returns graph describing the classifier (if possible).
`int` | `graphType()` Returns the type of graph this classifier represents.
`java.util.Enumeration` | `listOptions()` Returns an enumeration describing the available options.
`static void` | `main(java.lang.String[] argv)` Main method for testing this class.
`java.lang.String` | `numFoldsTipText()` Returns the tip text for this property
`void` | `setCVParameters(java.lang.Object[] params)` Set method for CVParameters.
`void` | `setNumFolds(int numFolds)` Sets the number of folds for the cross-validation.
`void` | `setOptions(java.lang.String[] options)` Parses a given list of options.
`java.lang.String` | `toString()` Returns description of the cross-validated classifier.
`java.lang.String` | `toSummaryString()` A concise description of the model.

Methods inherited from class weka.classifiers.RandomizableSingleClassifierEnhancer
`getSeed, seedTipText, setSeed`

Methods inherited from class weka.classifiers.SingleClassifierEnhancer
`classifierTipText, getClassifier, setClassifier`

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

### CVParameterSelection

    public CVParameterSelection()

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

### listOptions

    public java.util.Enumeration listOptions()

  Returns an enumeration describing the available options.

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

       -X <number of folds>
        Number of folds used for cross validation (default 10).

       -P <classifier parameter>
        Classifier parameter options.
        eg: "N 1 5 10" Sets an optimisation parameter for the
        classifier with name -N, with lower bound 1, upper bound
        5, and 10 optimisation steps. The upper bound may be the
        character 'A' or 'I' to substitute the number of
        attributes or instances in the training data,
        respectively. This parameter may be supplied more than
        once to optimise over several classifier options
        simultaneously.

       -S <num>
        Random number seed.
        (default 1)

       -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.rules.ZeroR)

       Options specific to classifier weka.classifiers.rules.ZeroR:

       -D
        If set, classifier is run in debug mode and
        may output additional info to the console

  Options after -- are passed to the designated sub-classifier.

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

### getBestClassifierOptions

    public java.lang.String[] getBestClassifierOptions()

  Returns (a copy of) the best options found for the classifier.

  Returns:
    the best options

### 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:
    `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

### distributionForInstance

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

  Predicts the class distribution for the given test instance.

  Overrides:
    `distributionForInstance` in class `Classifier`
  Parameters:
    `instance` - the instance to be classified
  Returns:
    the predicted class value
  Throws:
    `java.lang.Exception` - if an error occurred during the prediction

### addCVParameter

    public void addCVParameter(java.lang.String cvParam)
                        throws java.lang.Exception

  Adds a scheme parameter to the list of parameters to be set by cross-validation

  Parameters:
    `cvParam` - the string representation of a scheme parameter. The format is:
    param_char lower_bound upper_bound number_of_steps
    eg to search a parameter -P from 1 to 10 by increments of 1:
    P 1 10 11
  Throws:
    `java.lang.Exception` - if the parameter specifier is of the wrong format

### getCVParameter

    public java.lang.String getCVParameter(int index)

  Gets the scheme paramter with the given index.

  Parameters:
    `index` - the index for the parameter
  Returns:
    the scheme parameter

### CVParametersTipText

    public java.lang.String CVParametersTipText()

  Returns the tip text for this property

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

### getCVParameters

    public java.lang.Object[] getCVParameters()

  Get method for CVParameters.

  Returns:
    the CVParameters

### setCVParameters

    public void setCVParameters(java.lang.Object[] params)
                         throws java.lang.Exception

  Set method for CVParameters.

  Parameters:
    `params` - the CVParameters to use
  Throws:
    `java.lang.Exception` - if the setting of the CVParameters fails

### numFoldsTipText

    public java.lang.String numFoldsTipText()

  Returns the tip text for this property

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

### getNumFolds

    public int getNumFolds()

  Gets the number of folds for the cross-validation.

  Returns:
    the number of folds for the cross-validation

### setNumFolds

    public void setNumFolds(int numFolds)
                     throws java.lang.Exception

  Sets the number of folds for the cross-validation.

  Parameters:
    `numFolds` - the number of folds for the cross-validation
  Throws:
    `java.lang.Exception` - if parameter illegal

### graphType

    public int graphType()

  Returns the type of graph this classifier represents.

  Specified by:
    `graphType` in interface `Drawable`
  Returns:
    the type of graph this classifier represents

### graph

    public java.lang.String graph()
                           throws java.lang.Exception

  Returns graph describing the classifier (if possible).

  Specified by:
    `graph` in interface `Drawable`
  Returns:
    the graph of the classifier in dotty format
  Throws:
    `java.lang.Exception` - if the classifier cannot be graphed

### toString

    public java.lang.String toString()

  Returns description of the cross-validated classifier.

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

### toSummaryString

    public java.lang.String toSummaryString()

  A concise description of the model.

  Specified by:
    `toSummaryString` in interface `Summarizable`
  Returns:
    a concise description of the model

### 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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