weka.classifiers.meta

## Class AdaBoostM1

- java.lang.Object
- - weka.classifiers.AbstractClassifier
  - - weka.classifiers.SingleClassifierEnhancer
    - - weka.classifiers.IteratedSingleClassifierEnhancer
      - - weka.classifiers.RandomizableIteratedSingleClassifierEnhancer
        - - weka.classifiers.meta.AdaBoostM1

- All Implemented Interfaces:
    java.io.Serializable, java.lang.Cloneable, Classifier, IterativeClassifier, Sourcable, CapabilitiesHandler, CapabilitiesIgnorer, OptionHandler, Randomizable, RevisionHandler, TechnicalInformationHandler, WeightedInstancesHandler

      public class AdaBoostM1
      extends RandomizableIteratedSingleClassifierEnhancer
      implements WeightedInstancesHandler, Sourcable, TechnicalInformationHandler, IterativeClassifier

  Class for boosting a nominal class classifier using the Adaboost M1 method. Only nominal class problems can be tackled. Often dramatically improves performance, but sometimes overfits.
  For more information, see
  Yoav Freund, Robert E. Schapire: Experiments with a new boosting algorithm. In: Thirteenth International Conference on Machine Learning, San Francisco, 148-156, 1996.

  BibTeX:

       @inproceedings{Freund1996,
          address = {San Francisco},
          author = {Yoav Freund and Robert E. Schapire},
          booktitle = {Thirteenth International Conference on Machine Learning},
          pages = {148-156},
          publisher = {Morgan Kaufmann},
          title = {Experiments with a new boosting algorithm},
          year = {1996}
       }

  Valid options are:

       -P <num>
        Percentage of weight mass to base training on.
        (default 100, reduce to around 90 speed up)

       -Q
        Use resampling for boosting.

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

       -I <num>
        Number of iterations.
        (default 10)

       -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.trees.DecisionStump)

       Options specific to classifier weka.classifiers.trees.DecisionStump:

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

  Options after -- are passed to the designated classifier.

  Version:
    $Revision: 10969 $
  Author:
    Eibe Frank (eibe@cs.waikato.ac.nz), Len Trigg (trigg@cs.waikato.ac.nz)
  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `AdaBoostM1()` Constructor.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `buildClassifier(Instances data)` Method used to build the classifier.
    `double[]` | `distributionForInstance(Instance instance)` Calculates the class membership probabilities for the given test instance.
    `void` | `done()` Clean up after boosting.
    `Capabilities` | `getCapabilities()` Returns default capabilities of the classifier.
    `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` | `getUseResampling()` Get whether resampling is turned on
    `int` | `getWeightThreshold()` Get the degree of weight thresholding
    `java.lang.String` | `globalInfo()` Returns a string describing classifier
    `void` | `initializeClassifier(Instances data)` Initialize the classifier.
    `java.util.Enumeration<Option>` | `listOptions()` Returns an enumeration describing the available options.
    `static void` | `main(java.lang.String[] argv)` Main method for testing this class.
    `boolean` | `next()` Perform the next boosting iteration.
    `void` | `setOptions(java.lang.String[] options)` Parses a given list of options.
    `void` | `setUseResampling(boolean r)` Set resampling mode
    `void` | `setWeightThreshold(int threshold)` Set weight threshold
    `java.lang.String` | `toSource(java.lang.String className)` Returns the boosted model as Java source code.
    `java.lang.String` | `toString()` Returns description of the boosted classifier.
    `java.lang.String` | `useResamplingTipText()` Returns the tip text for this property
    `java.lang.String` | `weightThresholdTipText()` Returns the tip text for this property

    - ### Methods inherited from class weka.classifiers.RandomizableIteratedSingleClassifierEnhancer

      `getSeed, seedTipText, setSeed`

    - ### Methods inherited from class weka.classifiers.IteratedSingleClassifierEnhancer

      `getNumIterations, numIterationsTipText, setNumIterations`

    - ### Methods inherited from class weka.classifiers.SingleClassifierEnhancer

      `classifierTipText, getClassifier, setClassifier`

    - ### Methods inherited from class weka.classifiers.AbstractClassifier

      `classifyInstance, debugTipText, doNotCheckCapabilitiesTipText, forName, getDebug, getDoNotCheckCapabilities, makeCopies, makeCopy, runClassifier, setDebug, setDoNotCheckCapabilities`

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

    - ### Methods inherited from interface weka.classifiers.Classifier

      `classifyInstance`

- - ### Constructor Detail

    - #### AdaBoostM1

          public AdaBoostM1()

      Constructor.

  - ### Method Detail

    - #### globalInfo

          public java.lang.String globalInfo()

      Returns a string describing classifier
      Returns:
        a description 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<Option> listOptions()

      Returns an enumeration describing the available options.
      Specified by:
        `listOptions` in interface `OptionHandler`
      Overrides:
        `listOptions` in class `RandomizableIteratedSingleClassifierEnhancer`
      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:

           -P <num>
            Percentage of weight mass to base training on.
            (default 100, reduce to around 90 speed up)

           -Q
            Use resampling for boosting.

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

           -I <num>
            Number of iterations.
            (default 10)

           -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.trees.DecisionStump)

           Options specific to classifier weka.classifiers.trees.DecisionStump:

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

      Options after -- are passed to the designated classifier.

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

    - #### weightThresholdTipText

          public java.lang.String weightThresholdTipText()

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

    - #### setWeightThreshold

          public void setWeightThreshold(int threshold)

      Set weight threshold
      Parameters:
        `threshold` - the percentage of weight mass used for training

    - #### getWeightThreshold

          public int getWeightThreshold()

      Get the degree of weight thresholding
      Returns:
        the percentage of weight mass used for training

    - #### useResamplingTipText

          public java.lang.String useResamplingTipText()

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

    - #### setUseResampling

          public void setUseResampling(boolean r)

      Set resampling mode
      Parameters:
        `r` - true if resampling should be done

    - #### getUseResampling

          public boolean getUseResampling()

      Get whether resampling is turned on
      Returns:
        true if resampling output is on

    - #### getCapabilities

          public Capabilities getCapabilities()

      Returns default capabilities of the classifier.
      Specified by:
        `getCapabilities` in interface `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 data)
                               throws java.lang.Exception

      Method used to build the classifier.
      Specified by:
        `buildClassifier` in interface `Classifier`
      Overrides:
        `buildClassifier` in class `IteratedSingleClassifierEnhancer`
      Parameters:
        `data` - the training data to be used for generating the bagged classifier.
      Throws:
        `java.lang.Exception` - if the classifier could not be built successfully

    - #### initializeClassifier

          public void initializeClassifier(Instances data)
                                    throws java.lang.Exception

      Initialize the classifier.
      Specified by:
        `initializeClassifier` in interface `IterativeClassifier`
      Parameters:
        `data` - the training data to be used for generating the boosted classifier.
      Throws:
        `java.lang.Exception` - if the classifier could not be built successfully

    - #### next

          public boolean next()
                       throws java.lang.Exception

      Perform the next boosting iteration.
      Specified by:
        `next` in interface `IterativeClassifier`
      Returns:
        false if no further iterations could be performed, true otherwise
      Throws:
        `java.lang.Exception` - if an unforeseen problem occurs

    - #### done

          public void done()

      Clean up after boosting.
      Specified by:
        `done` in interface `IterativeClassifier`

    - #### distributionForInstance

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

      Calculates the class membership probabilities for the given test instance.
      Specified by:
        `distributionForInstance` in interface `Classifier`
      Overrides:
        `distributionForInstance` in class `AbstractClassifier`
      Parameters:
        `instance` - the instance to be classified
      Returns:
        predicted class probability distribution
      Throws:
        `java.lang.Exception` - if instance could not be classified successfully

    - #### toSource

          public java.lang.String toSource(java.lang.String className)
                                    throws java.lang.Exception

      Returns the boosted model as Java source code.
      Specified by:
        `toSource` in interface `Sourcable`
      Parameters:
        `className` - the classname of the generated class
      Returns:
        the tree as Java source code
      Throws:
        `java.lang.Exception` - if something goes wrong

    - #### toString

          public java.lang.String toString()

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

    - #### getRevision

          public java.lang.String getRevision()

      Returns the revision string.
      Specified by:
        `getRevision` in interface `RevisionHandler`
      Overrides:
        `getRevision` in class `AbstractClassifier`
      Returns:
        the revision

    - #### main

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

      Main method for testing this class.
      Parameters:
        `argv` - the options