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// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
//-----------------------------------------------------------------------------
// eoEasyPSO.h
// (c) OPAC 2007
/*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Contact: thomas.legrand@lifl.fr
*/
//-----------------------------------------------------------------------------
#ifndef _EOEASYPSO_H
#define _EOEASYPSO_H
//-----------------------------------------------------------------------------
#include <eoContinue.h>
#include <eoPSO.h>
#include <eoVelocity.h>
#include <eoFlight.h>
//-----------------------------------------------------------------------------
/** An easy-to-use particle swarm algorithm.
* Use any particle, any flight, any topology...
*
* The main steps are :
* (The population is expected to be already evaluated)
* - for each generation and each particle pi
* - evaluate the velocities
* -- perform the fligth of pi
* -- evaluate pi
* -- update the neighborhoods
*
* @ingroup Algorithms
*/
template < class POT > class eoEasyPSO:public eoPSO < POT >
{
public:
/** Full constructor
* @param _init - An eoInitializerBase that initializes the topology, velocity, best particle(s)
* @param _continuator - An eoContinue that manages the stopping criterion and the checkpointing system
* @param _eval - An eoEvalFunc: the evaluation performer
* @param _velocity - An eoVelocity that defines how to compute the velocities
* @param _flight - An eoFlight that defines how to make the particle flying: that means how
* to modify the positions according to the velocities
*/
eoEasyPSO (
eoInitializerBase <POT> &_init,
eoContinue < POT > &_continuator,
eoEvalFunc < POT > &_eval,
eoVelocity < POT > &_velocity,
eoFlight < POT > &_flight):
init(_init),
continuator (_continuator),
eval (_eval),
velocity (_velocity),
flight (_flight)
{}
/** Constructor without eoFlight. For special cases when the flight is performed withing the velocity.
* @param _init - An eoInitializerBase that initializes the topology, velocity, best particle(s)
* @param _continuator - An eoContinue that manages the stopping criterion and the checkpointing system
* @param _eval - An eoEvalFunc: the evaluation performer
* @param _velocity - An eoVelocity that defines how to compute the velocities
*/
eoEasyPSO (
eoInitializerBase <POT> &_init,
eoContinue < POT > &_continuator,
eoEvalFunc < POT > &_eval,
eoVelocity < POT > &_velocity):
init(_init),
continuator (_continuator),
eval (_eval),
velocity (_velocity),
flight (dummyFlight)
{}
/* Constructor without eoInitializerBase. Assume the initialization is done before running the algorithm
* @param _continuator - An eoContinue that manages the stopping criterion and the checkpointing system
* @param _eval - An eoEvalFunc: the evaluation performer
* @param _velocity - An eoVelocity that defines how to compute the velocities
* @param _flight - An eoFlight that defines how to make the particle flying: that means how
* to modify the positions according to the velocities
*/
eoEasyPSO (
eoContinue < POT > &_continuator,
eoEvalFunc < POT > &_eval,
eoVelocity < POT > &_velocity,
eoFlight < POT > &_flight):
init(dummyInit),
continuator (_continuator),
eval (_eval),
velocity (_velocity),
flight (_flight)
{}
/** Constructor without eoFlight nor eoInitializerBase. For special cases when the flight is performed withing the velocity.
* @param _continuator - An eoContinue that manages the stopping criterion and the checkpointing system
* @param _eval - An eoEvalFunc: the evaluation performer
* @param _velocity - An eoVelocity that defines how to compute the velocities
*/
eoEasyPSO (
eoContinue < POT > &_continuator,
eoEvalFunc < POT > &_eval,
eoVelocity < POT > &_velocity):
init(dummyInit),
continuator (_continuator),
eval (_eval),
velocity (_velocity),
flight (dummyFlight)
{}
/// Apply a few iteration of flight to the population (=swarm).
virtual void operator () (eoPop < POT > &_pop)
{
try
{
// initializes the topology, velocity, best particle(s)
init();
do
{
// loop over all the particles for the current iteration
for (unsigned idx = 0; idx < _pop.size (); idx++)
{
// perform velocity evaluation
velocity (_pop[idx],idx);
// apply the flight
flight (_pop[idx]);
// evaluate the position
eval (_pop[idx]);
// update the topology (particle and local/global best(s))
velocity.updateNeighborhood(_pop[idx],idx);
}
}
while (continuator (_pop));
}
catch (std::exception & e)
{
std::string s = e.what ();
s.append (" in eoEasyPSO");
throw std::runtime_error (s);
}
}
protected:
eoInitializerBase <POT> &init;
eoContinue < POT > &continuator;
eoEvalFunc < POT > &eval;
eoVelocity < POT > &velocity;
eoFlight < POT > &flight;
// if the flight does not need to be used, use the dummy flight instance
class eoDummyFlight:public eoFlight < POT >
{
public:
eoDummyFlight () {}
void operator () (POT & _po) {}
}dummyFlight;
// if the initializer does not need to be used, use the dummy one instead
class eoDummyInitializer:public eoInitializerBase < POT >
{
public:
eoDummyInitializer () {}
void operator () (POT & _po) {}
}dummyInit;
};
/**
* @example t-eoEasyPSO.cpp
* Example of a test program building a PSO algorithm.
*/
#endif /*_EOEASYPSO_H*/