edu.stanford.nlp.classify

Class KNNClassifier<K,V>

java.lang.Object

edu.stanford.nlp.classify.KNNClassifier<K,V>

Type Parameters:

K - Class label type

V - Feature vector dimension type

All Implemented Interfaces:

Classifier<K,V>, java.io.Serializable

public class KNNClassifier<K,V>
extends java.lang.Object
implements Classifier<K,V>

A simple k-NN classifier, with the options of using unit votes, or weighted votes (by similarity value). Use the KNNClassifierFactory class to train and instantiate a new classifier. NOTE: partially generified, waiting for final generification of classifiers package.

Author:

Eric Yeh

See Also:

Serialized Form

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	KNNClassifier(int k, boolean weightedVotes, boolean l2Normalize)

Method Summary

Modifier and Type	Method and Description
protected void	addInstances(java.util.Collection<RVFDatum<K,V>> datums)
K	classOf(Datum<K,V> example) NOTE: currently does not support standard Datums, only RVFDatums.
java.util.Collection<K>	labels()
static void	main(java.lang.String[] args)
ClassicCounter<K>	scoresOf(Datum<K,V> datum) Given an instance to classify, scores and returns score by class.

Methods inherited from class java.lang.Object

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

Methods inherited from interface edu.stanford.nlp.classify.Classifier

evaluateAccuracy, evaluatePrecisionAndRecall

Constructor Detail

KNNClassifier

protected KNNClassifier(int k,
                        boolean weightedVotes,
                        boolean l2Normalize)

Method Detail

labels

public java.util.Collection<K> labels()

Specified by:

labels in interface Classifier<K,V>

addInstances

protected void addInstances(java.util.Collection<RVFDatum<K,V>> datums)

classOf

public K classOf(Datum<K,V> example)

NOTE: currently does not support standard Datums, only RVFDatums.

Specified by:

classOf in interface Classifier<K,V>

scoresOf

public ClassicCounter<K> scoresOf(Datum<K,V> datum)

Given an instance to classify, scores and returns score by class. NOTE: supports only RVFDatums

Specified by:

scoresOf in interface Classifier<K,V>

main

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