iactivationfunction.java

利用Java实现的神经网络工具箱

/*
 * $RCSfile: IActivationFunction.java,v $
 * $Revision: 1.2 $
 * $Date: 2004/10/17 01:35:30 $
 *
 * NeuralNetworkToolkit
 * Copyright (C) 2004 Universidade de Brasília
 *
 * This file is part of NeuralNetworkToolkit.
 *
 * NeuralNetworkToolkit is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * NeuralNetworkToolkit is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with NeuralNetworkToolkit; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 - USA.
 */

package neuralnetworktoolkit.activationfunctions;

/**
 * Interface that defines some basic features of an activation
 * function.
 * 
 * @version $Revision: 1.2 $ - $Date: 2004/10/17 01:35:30 $
 * 
 * @author <a href="mailto:[e-mail]">Hugo Iver V. Gonçalves</a>
 * @author <a href="mailto:[e-mail]">Rodrigo C. M. Coimbra</a>
 */
public interface IActivationFunction {
	
	/**
	 * Returns activation function value corresponding to input.
	 * 
	 * @param input Input value to function.
	 * 
	 * @return Function calculated value.
	 */
	public double functionValue(double input);
	
	/**
	 * Returns activation function derivative value corresponding
	 * to input.
	 * 
	 * @param input Input value to function derivative.
	 * 
	 * @return Function derivative calculated value.
	 */
	public double functionDerivative(double input);
	
	/**
	 * Returns the function name.
	 * 
	 * @return Function name.
	 */
	public String getFunctionName();
	
	/**
	 * Returns the function expression.
	 * 
	 * @return Function expression.
	 */
	public String getFunctionExpression();
	
	/**
	 * Returns the function derivative expression.
	 * 
	 * @return Function derivative expression.
	 */
	public String getFunctionDerivativeExpression();

} //IActivationFunction()