EvolvingObjects
eoConstrictedVelocity< POT > Class Template Reference

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

#include <eoConstrictedVelocity.h>

Inheritance diagram for eoConstrictedVelocity< POT >:
eoVelocity< POT > eoBF< POT &, unsigned, void > eoFunctorBase binary_function

List of all members.

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
eoRnggen
eoRealVectorBoundsbounds
eoRealBoundModifierbndsModifier
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

Implements eoBF< POT &, unsigned, void >.

Definition at line 136 of file eoConstrictedVelocity.h.

References eoRealVectorBounds::adjust_size(), eoRealBaseVectorBounds::minimum(), and eoRng::uniform().

template<class POT >
eoTopology<POT>& eoConstrictedVelocity< POT >::getTopology ( ) [inline, virtual]

eoTopology<POT> getTopology

Returns:
topology

Implements eoVelocity< POT >.

Definition at line 179 of file eoConstrictedVelocity.h.


The documentation for this class was generated from the following file:
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