ComputeJacobian.java

/*
 * Encog(tm) Core v2.5 - Java Version
 * http://www.heatonresearch.com/encog/
 * http://code.google.com/p/encog-java/
 
 * Copyright 2008-2010 Heaton Research, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
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package org.encog.neural.networks.training.lma;

/**
 * Calculate the Jacobian.
 */
public interface ComputeJacobian {

	/**
	 * Calculate the Jacobian.
	 * @param weights The neural network weights and bias values.
	 * @return The sum of squared errors.
	 */
	double calculate(double[] weights);

	/**
	 * @return The Jacobian matrix after it is calculated.
	 */
	double[][] getJacobian();

	/**
	 * @return The errors for each row of the matrix.
	 */
	double[] getRowErrors();

}