Distributed Genetic Programming Framework
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File org.dgpf.gp.vm.fitness.CostPressure.java

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 * Copyright (c) 2006 Thomas Weise
 * E-Mail           : tweise@gmx.de
 * Last modification: 2006-07-03
 * Original Filename: org.dgpf.vm.fitness.CostPressure.java
 * Version          : 1.0.0
 * Last modification: 2006-07-03
 *                by: Thomas Weise
 *                    Version 2.1, February 1999
 *                    You should have received a copy of this license along
 *                    with this library; if not, write to the Free Software
 *                    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *                    MA 02111-1307, USA or download the license under
 *                    http://www.gnu.org/copyleft/lesser.html.
 * Warranty         : This software is provided "as is" without any
 *                    warranty; without even the implied warranty of
 *                    merchantability or fitness for a particular purpose.
 *                    See the Gnu Lesser General Public License for more
 *                    details.

package org.dgpf.gp.vm.fitness;

import org.dgpf.gp.vm.base.Program;
import org.dgpf.gp.vm.base.VMContext;
import org.dgpf.search.api.FitnessData;
import org.dgpf.search.api.FitnessFunction;
import org.dgpf.search.api.SearchContext;

 * This fitness function applies parsimony pressure to the costs of
 * executing a program.
 * @author Thomas Weise

public class CostPressure extends FitnessFunction<Program,
 * The globally shared instance of the cost pressure fitness function.

  public  static  final FitnessFunction<Program, FitnessData<Program>>
    DEFAULT_INSTANCE = new CostPressure(-1);


 * Create a new cost pressure fitness function.
 * @param p_precision   The precision of this fitness function. This is the
 *                      count of levels to be used for the calculation.
 *                      If this parameter is <= 0.0d, the full precision
 *                      available will be used.

  public  CostPressure(final double p_precision)
    super(-1, p_precision);

 * This method is called when a simulation has come to an end.
 * You must use this method to store a fitness value into the fitness
 * record <code>p_fitness</code>. Use <code>set_fitness</code> for this.
 * @param p_fitness       The fitness data record that was used in this
 *                        simulation.
 * @param p_context       The context that has driven the simulation.
 * @see FitnessData#set_fitness(double)

  protected  final  void end_simulation(
                            final FitnessData<Program>    p_fitness,
                            final SearchContext<Program>  p_context)
           1.0d / (1.0d + ((VMContext)p_context).get_consumed_costs() ) ) ; 

 * Returns a human readable name of this fitness function.
 * @return A human readable name of this fitness function.

  public  final  String  toString  ()
    return "cost";

File Information:

file name:CostPressure.java
qualified name:org.dgpf.gp.vm.fitness.CostPressure.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/gp/vm/fitness/CostPressure.java
size:3.153 KB (3229 B)
uploaded: 2018-01-07 12:03:34 GMT+0000
last update: 2006-08-22 10:54:50 GMT+0000
last access: 2018-04-25 06:25:41 GMT+0000

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