org.encog.mathutil.matrices.hessian

Class BasicHessian

java.lang.Object

org.encog.mathutil.matrices.hessian.BasicHessian

All Implemented Interfaces:

ComputeHessian

Direct Known Subclasses:

HessianCR, HessianFD

public abstract class BasicHessian
extends java.lang.Object
implements ComputeHessian

Some basic code used to calculate Hessian matrixes.

Constructor Summary

Constructors

Constructor and Description
BasicHessian()

Method Summary

Modifier and Type	Method and Description
void	clear() Clear the Hessian and gradients.
double[]	getGradients() The gradeints.
double[][]	getHessian()
Matrix	getHessianMatrix()
double	getSSE()
void	init(BasicNetwork theNetwork, MLDataSet theTraining) Init the class.
void	updateHessian(double[] d) Update the Hessian, sum's with what is in the Hessian already.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.encog.mathutil.matrices.hessian.ComputeHessian

compute

Constructor Detail

BasicHessian

public BasicHessian()

Method Detail

init

public void init(BasicNetwork theNetwork,
                 MLDataSet theTraining)

Init the class.

Specified by:

init in interface ComputeHessian

Parameters:

theNetwork - The neural network to train.

theTraining - The training set to train with.

getGradients

public double[] getGradients()

The gradeints.

Specified by:

getGradients in interface ComputeHessian

Returns:

The gradients for the Hessian.

getHessianMatrix

public Matrix getHessianMatrix()

Specified by:

getHessianMatrix in interface ComputeHessian

Returns:

The Hessian matrix.

getHessian

public double[][] getHessian()

Specified by:

getHessian in interface ComputeHessian

Returns:

Get the Hessian as a 2d array.

clear

public void clear()

Clear the Hessian and gradients.

Specified by:

clear in interface ComputeHessian

getSSE

public double getSSE()

Specified by:

getSSE in interface ComputeHessian

Returns:

The sum of squares error over all of the training elements.

updateHessian

public void updateHessian(double[] d)

Update the Hessian, sum's with what is in the Hessian already. Call clear to clear out old Hessian.

Parameters:

d - Vector to update with.