types
Class LinearClassifier

java.lang.Object
  types.LinearClassifier

public class LinearClassifier
extends Object

A linear model for classification. It has the form h(x) = arg_max_y f(x,y).w

Author:

kuzman

Field Summary

double[]	w
Alphabet	xAlphabet
Alphabet	yAlphabet

Constructor Summary

LinearClassifier(Alphabet xAlpha, Alphabet yAlpha, FeatureFunction fxy)

Method Summary

int	label(SparseVector x) computes the classification according to this linear classifier.
void	readObject(ObjectInputStream in)
double[]	scores(SparseVector x) computes the score of each label 'y' defined as f(x,y) .
void	writeObject(ObjectOutputStream out)

Methods inherited from class java.lang.Object

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

Field Detail

w

public double[] w

yAlphabet

public Alphabet yAlphabet

xAlphabet

public Alphabet xAlphabet

Constructor Detail

LinearClassifier

public LinearClassifier(Alphabet xAlpha,
                        Alphabet yAlpha,
                        FeatureFunction fxy)

Method Detail

scores

public double[] scores(SparseVector x)

computes the score of each label 'y' defined as f(x,y) . w

Parameters:

x -

Returns:

[f(x,0).w, f(x,1).w, ...]

label

public int label(SparseVector x)

computes the classification according to this linear classifier. arg_max_y f(x,y) . w

Parameters:

x -

Returns:

y that maximizes f(x,y) . w

writeObject

public void writeObject(ObjectOutputStream out)
                 throws IOException

Throws:

IOException

readObject

public void readObject(ObjectInputStream in)
                throws IOException,
                       ClassNotFoundException

Throws:

IOException

ClassNotFoundException