edu.umass.cs.mallet.base.classify

Class AdaBoostM2

java.lang.Object

edu.umass.cs.mallet.base.classify.Classifier

edu.umass.cs.mallet.base.classify.AdaBoostM2

All Implemented Interfaces:

Serializable

public class AdaBoostM2
extends Classifier
implements Serializable

AdaBoostM2

Yoav Freund and Robert E. Schapire "Experiments with a New Boosting Algorithm" In Journal of Machine Learning: Proceedings of the 13th International Conference, 1996 http://www.cs.princeton.edu/~schapire/papers/FreundSc96b.ps.Z

Author:

Gary Huang ghuang@cs.umass.edu

See Also:

Serialized Form

Field Summary

Fields inherited from class edu.umass.cs.mallet.base.classify.Classifier

instancePipe

Constructor Summary

Constructors

Constructor and Description
AdaBoostM2(Pipe instancePipe, Classifier[] weakClassifiers, double[] alphas)

Method Summary

Modifier and Type	Method and Description
Classification	classify(Instance inst)
Classification	classify(Instance inst, int numWeakClassifiersToUse) Classify the given instance using only the first numWeakClassifiersToUse classifiers trained during boosting
int	getNumWeakClassifiers() Get the number of weak classifiers in this ensemble classifier
AdaBoostM2	getTrimmedClassifier(int numWeakClassifiersToUse) Return an AdaBoostM2 classifier that uses only the first numWeakClassifiersToUse weak learners.

Methods inherited from class edu.umass.cs.mallet.base.classify.Classifier

classify, classify, classify, getAccuracy, getAccuracy, getAlphabet, getF1, getF1, getF1, getF1, getInstancePipe, getLabelAlphabet, getPrecision, getPrecision, getPrecision, getPrecision, getRecall, getRecall, getRecall, getRecall, print, print

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AdaBoostM2

public AdaBoostM2(Pipe instancePipe,
                  Classifier[] weakClassifiers,
                  double[] alphas)

Method Detail

getNumWeakClassifiers

public int getNumWeakClassifiers()

Get the number of weak classifiers in this ensemble classifier

getTrimmedClassifier

public AdaBoostM2 getTrimmedClassifier(int numWeakClassifiersToUse)

Return an AdaBoostM2 classifier that uses only the first numWeakClassifiersToUse weak learners.

The returned classifier's Pipe and weak classifiers are backed by the respective objects of this classifier, so changes to the returned classifier's Pipe and weak classifiers are reflected in this classifier, and vice versa.

classify

public Classification classify(Instance inst)

Specified by:

classify in class Classifier

classify

public Classification classify(Instance inst,
                               int numWeakClassifiersToUse)

Classify the given instance using only the first numWeakClassifiersToUse classifiers trained during boosting