opennlp.tools.ml.maxent.quasinewton

Class NegLogLikelihood

java.lang.Object

opennlp.tools.ml.maxent.quasinewton.NegLogLikelihood

All Implemented Interfaces:

Function

Direct Known Subclasses:

ParallelNegLogLikelihood

public class NegLogLikelihood
extends java.lang.Object
implements Function

Evaluate negative log-likelihood and its gradient from DataIndexer.

Constructor Summary

Constructors

Constructor and Description
NegLogLikelihood(DataIndexer indexer)

Method Summary

Modifier and Type	Method and Description
int	getDimension()
double[]	getInitialPoint()
double[]	gradientAt(double[] x) Compute gradient
double	valueAt(double[] x) Negative log-likelihood

Methods inherited from class java.lang.Object

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

Constructor Detail

NegLogLikelihood

public NegLogLikelihood(DataIndexer indexer)

Method Detail

getDimension

public int getDimension()

Specified by:

getDimension in interface Function

getInitialPoint

public double[] getInitialPoint()

valueAt

public double valueAt(double[] x)

Negative log-likelihood

Specified by:

valueAt in interface Function

gradientAt

public double[] gradientAt(double[] x)

Compute gradient

Specified by:

gradientAt in interface Function