dmi_aboutfitnessalgorithms.java

使用java编写的关于通讯及串口编程所必需的类库

/*
 * DMI_AboutFitnessAlgorithms.java
 *
 * Created on March 11, 2003, 9:19 PM
 */

package com.adaptiveview.ospso.dmi;

/** Documentation: About <b>PSO Fitness Algorithms</b>.
 *<p>If you've taken a look at the FitnessAlgorithm classes in the .test package
 * you may think that what we are calling Fitness Algorithms would be more 
 * appropriately named Problem Definitions. From the perspective of the particles,
 * though, they don't know -- and they don't need to know -- anything about the
 * problem you're using PSO to find solutions for. All they need to know is how
 * their location compares in terms of "fitness" with other locations. How you
 * use the coordinates of their location to determine a fitness value is up to
 * you so long as the comparison of fitness values for different locations
 * accurately indicates which location has the better fitness value.
 *
 *<p>In general, it's up to you to define how fitness values are ranked. However,
 * the implementation used in these programs assumes that a <b>higher</b> fitness value
 * (closer to positive infinity) <b>is better</b> than a lower one and, in practice, we
 * tend to use zero (0) as the target fitness value and negative fitness values
 * for all sub-optimal solutions. Therefore, for a function like <code>x/y = Math.PI</code>,
 * for example, we calculate the fitness using: 
 * <code>fitness = 0.0 - Math.abs(Math.PI - (x/y));</code>.
 *
 *<p>It's important to keep in mind that no matter how close two particles get to
 * each other in the solution space if one of the particle's coordinates yield a 
 * better solution then that particle's location must get a higher fitness. The
 * Move Algorithm is desinged to <i>favor</i> heading in the direction of locations with
 * higher fitness values. If you create a fitness function that gives <i>every</i> wrong
 * solution the same fitness value (e.g., -10.0) the Move Algorithm won't be able to tell if 
 * one location is better than another (unless a particle happens to land on the
 * coordinates of a solution). 
 *
 * @author  AdaptiveView.com
 */
public interface DMI_AboutFitnessAlgorithms extends DMI {}