Constricted velocity performer for particle swarm optimization. More...

#include <eoConstrictedVelocity.h>

Inheritance diagram for eoConstrictedVelocity< POT >:

Public Types
typedef POT::ParticleVelocityType	VelocityType
Public Member Functions
	eoConstrictedVelocity (eoTopology< POT > &_topology, const VelocityType &_coeff, const VelocityType &_c1, const VelocityType &_c2, eoRealVectorBounds &_bounds, eoRealBoundModifier &_bndsModifier, eoRng &_gen=rng)
	Full constructor: Bounds and bound modifier required.
	eoConstrictedVelocity (eoTopology< POT > &_topology, const VelocityType &_coeff, const VelocityType &_c1, const VelocityType &_c2, eoRealVectorBounds &_bounds, eoRng &_gen=rng)
	Constructor: No bound updater required <-> fixed bounds.
	eoConstrictedVelocity (eoTopology< POT > &_topology, const VelocityType &_coeff, const VelocityType &_c1, const VelocityType &_c2, eoRng &_gen=rng)
	Constructor: Neither bounds nor bound updater required <-> free velocity.
void	operator() (POT &_po, unsigned _indice)
	Evaluate the new velocities of the given particle.
void	updateNeighborhood (POT &_po, unsigned _indice)
	Update the neighborhood of a particle.
eoTopology< POT > &	getTopology ()
	eoTopology<POT> getTopology
Protected Attributes
eoTopology< POT > &	topology
const VelocityType &	c1
const VelocityType &	c2
const VelocityType &	coeff
eoRng &	gen
eoRealVectorBounds &	bounds
eoRealBoundModifier &	bndsModifier
eoDummyRealBoundModifier	dummyModifier

Detailed Description

template<class POT>
class eoConstrictedVelocity< POT >

Constricted velocity performer for particle swarm optimization.

Derivated from abstract eoVelocity, At step t+1 : v(t+1)= C * [ v(t) + c1*r1 * (xbest(t)-x(t)) + c2*r2 * (gbest(t) - x(t)) ] C is fixed for all the particles and all the generations. Default C = 2 * k / abs(2 - P - sqrt (P*(P-4))) (ci and C given;P=c1*r1 + c2*r2 ; Ri chosen at random * in [0;1])

Definition at line 46 of file eoConstrictedVelocity.h.

Constructor & Destructor Documentation

template<class POT >

eoConstrictedVelocity< POT >::eoConstrictedVelocity	(	eoTopology< POT > &	_topology,
		const VelocityType &	_coeff,
		const VelocityType &	_c1,
		const VelocityType &	_c2,
		eoRealVectorBounds &	_bounds,
		eoRealBoundModifier &	_bndsModifier,
		eoRng &	_gen = `rng`
	)		`[inline]`

Full constructor: Bounds and bound modifier required.

Parameters:

_topology	- The topology to get the global/local/other best
_coeff	- The constriction coefficient
_c1	- The first learning factor used for the particle's best. Type must be POT::ParticleVelocityType
_c2	- The second learning factor used for the local/global best(s). Type must be POT::ParticleVelocityType
_bounds	- An eoRealBaseVectorBounds: real bounds for real velocities. If the velocities are not real, they won't be bounded by default. Should have a eoBounds ?
_bndsModifier	- An eoRealBoundModifier used to modify the bounds (for real bounds only).
_gen	- The eo random generator, default=rng

Definition at line 66 of file eoConstrictedVelocity.h.

template<class POT >

eoConstrictedVelocity< POT >::eoConstrictedVelocity	(	eoTopology< POT > &	_topology,
		const VelocityType &	_coeff,
		const VelocityType &	_c1,
		const VelocityType &	_c2,
		eoRealVectorBounds &	_bounds,
		eoRng &	_gen = `rng`
	)		`[inline]`

Constructor: No bound updater required <-> fixed bounds.

Parameters:

_topology	- The topology to get the global/local/other best
_coeff	- The constriction coefficient
_c1	- The first learning factor used for the particle's best. Type must be POT::ParticleVelocityType
_c2	- The second learning factor used for the local/global best(s). Type must be POT::ParticleVelocityType
_bounds	- An eoRealBaseVectorBounds: real bounds for real velocities. If the velocities are not real, they won't be bounded by default. Should have a eoBounds ?
_gen	- The eo random generator, default=rng

Definition at line 91 of file eoConstrictedVelocity.h.

template<class POT >

eoConstrictedVelocity< POT >::eoConstrictedVelocity	(	eoTopology< POT > &	_topology,
		const VelocityType &	_coeff,
		const VelocityType &	_c1,
		const VelocityType &	_c2,
		eoRng &	_gen = `rng`
	)		`[inline]`

Constructor: Neither bounds nor bound updater required <-> free velocity.

Parameters:

_topology	- The topology to get the global/local/other best
_coeff	- The constriction coefficient
_c1	- The first learning factor used for the particle's best. Type must be POT::ParticleVelocityType
_c2	- The second learning factor used for the local/global best(s). Type must be POT::ParticleVelocityType
_gen	- The eo random generator, default=rng

Definition at line 113 of file eoConstrictedVelocity.h.

Member Function Documentation

template<class POT >

void eoConstrictedVelocity< POT >::operator()	(	POT &	_po,
		unsigned	_indice
	)		`[inline, virtual]`

Evaluate the new velocities of the given particle.

Need an indice to identify the particle into the topology. Steps are :

evaluate r1 and r2, the customed learning factors
adjust the size of the bounds (even if dummy)
modify the bounds with the bounds modifier (use the dummy modifier if there's no modifier provided)
Parameters:

_po - A particle

_indice - The indice (into the topology) of the given particle