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File org.dgpf.gp.automaton.fitness.MemorySizePressure.java

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/*
 * Copyright (c) 2006 Thomas Weise
 *
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-03-19 13:53:00
 * Original Filename: org.dgpf.automaton.fitness.MemorySizePressure.java
 * Version          : 2.3.1
 * Last modification: 2006-05-12
 *                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.automaton.fitness;

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

/**
 * The memory size pressure fitness function is used to prevent programs
 * from using too much memory.
 *
 * @author Thomas Weise
 */

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

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

/**
 * The maximum amount of memory that a program is allowed to use.
 */

  private final int m_max_mem  ;

/**
 * Create a new memory size pressure fitness function.
 * @param p_max_memory  The maximum memory size a program is allowed to use.
 * @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  MemorySizePressure(final int p_max_memory,
                             final double p_precision)
    {
    super(-1, -1);
    this.m_max_mem = ((p_max_memory > 0) ? p_max_memory : Integer.MAX_VALUE);
    }

/**
 * 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)
    {
    p_fitness.set_fitness(
                1.0d / (1 + p_context.get_current().get_memory_size()));
    }

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

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

/**
 * Perform a sanity check if there is any use in simulating this individual.
 * @param p_individual  The individual to be sanity-checked.
 * @return  <code>true</code> if and only if the individual shall be
 *          evaluated, <code>false</code> to abort evaluation of the
 *          individual because it is wack for some reason.
 */

  @Override
  protected  final  boolean should_simulate (final Program p_individual)
    {
    int l_i;

    l_i = p_individual.get_memory_size();
    return ((l_i > 0) && (l_i <= this.m_max_mem));
    }
  }

File Information:

file name:MemorySizePressure.java
package:org.dgpf.gp.automaton.fitness
qualified name:org.dgpf.gp.automaton.fitness.MemorySizePressure.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/gp/automaton/fitness/MemorySizePressure.java
size:4.045 KB (4143 B)
uploaded: 2015-07-22 04:10:55 GMT+0000
last update: 2006-08-22 11:01:24 GMT+0000
last access: 2017-11-18 23:04:58 GMT+0000

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