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File org.dgpf.gp.netvm.fitness.ErrorPressure.java

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/*
 * Copyright (c) 2006 Thomas Weise
 *
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-07-08 11:53:00
 * Original Filename: org.dgpf.netvm.fitness.MinimizeTransmissionPressure.java
 * Version          : 1.0.0
 * Last modification: 2006-07-08
 *                by: Thomas Weise
 *
 * License          : GNU LESSER GENERAL PUBLIC LICENSE
 *                    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.netvm.fitness;

import org.dgpf.gp.netvm.base.NetVMContext;
import org.dgpf.gp.vm.base.Program;
import org.dgpf.gp.vm.base.VM;
import org.dgpf.search.api.FitnessData;
import org.dgpf.search.api.FitnessFunction;
import org.dgpf.search.api.SearchContext;


/**
 * The transmission pressure fitness function is used to prevent programs
 * from producing too much errors.
 *
 * @author Thomas Weise
 */

public class ErrorPressure extends FitnessFunction<Program,
                                                      FitnessData<Program>>
  {
/**
 * The globally shared instance of the transmission pressure fitness
 * function.
 */

  public  static  final FitnessFunction<Program, FitnessData<Program>>
    DEFAULT_INSTANCE = new ErrorPressure(5.0d);

/**
 * Create a new transmission 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  ErrorPressure(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)
 */

  @Override
  protected  final  void end_simulation(
                            final FitnessData<Program>    p_fitness,
                            final SearchContext<Program>  p_context)
    {
    NetVMContext l_c;
    int          l_i;
    VM           l_v;
    long         l_e, l_cc;
    
    l_c  = ((NetVMContext)p_context);
    l_cc = 0L;
    l_e  = 0L;
    for(l_i = (l_c.get_vm_count()-1); l_i >= 0; l_i--)
      {
      l_v = l_c.get_vm(l_i);
      
      l_cc += l_v.get_frame_errors();
      l_e  += l_v.get_mem_errors();
      }
       
    
    p_fitness.set_fitness(((l_e > 0) || (l_cc > 0)) ? (1.0d/(l_e+l_cc))
                                                    : 1.0d); 
    }

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

  @Override
  public  final  String  toString  ()
    {
    return "error";
    }
  }

File Information:

file name:ErrorPressure.java
package:org.dgpf.gp.netvm.fitness
qualified name:org.dgpf.gp.netvm.fitness.ErrorPressure.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/gp/netvm/fitness/ErrorPressure.java
size:3.655 KB (3743 B)
uploaded: 2015-07-22 04:10:56 GMT+0000
last update: 2006-08-23 07:07:19 GMT+0000
last access: 2017-11-22 09:26:37 GMT+0000

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