add new velocities and correct errors
git-svn-id: svn://scm.gforge.inria.fr/svnroot/paradiseo@300 331e1502-861f-0410-8da2-ba01fb791d7f
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branches/pso/eoFixedInertiaWeightedVelocity.h
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branches/pso/eoFixedInertiaWeightedVelocity.h
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// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoFixedInertiaWeightedVelocity.h
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// (c) OPAC 2007
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/*
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Contact: paradiseo-help@lists.gforge.inria.fr
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*/
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//-----------------------------------------------------------------------------
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#ifndef EOFIXEDINERTIAWEIGHTEDVELOCITY_H
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#define EOFIXEDINERTIAWEIGHTEDVELOCITY_H
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//-----------------------------------------------------------------------------
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#include <eoFunctor.h>
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#include <utils/eoRNG.h>
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#include <eoPop.h>
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#include <utils/eoRealVectorBounds.h>
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#include <eoTopology.h>
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//-----------------------------------------------------------------------------
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/** Inertia weight based velocity performer. Derivated from abstract eoVelocity,
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* At step t+1 : v(t+1)= w * v(t) + delta1 * ( xbest(t)-x(t) ) + delta2 * ( gbest(t) - x(t) )
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* with delta1= c1 * R1 and delta2= c2 * R2 (ci and w given; Ri chosen at random
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* in [0;1])
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*/
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template < class POT > class eoFixedInertiaWeightedVelocity:public eoVelocity < POT >
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{
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public:
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/*
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* Each element for the velocity evaluation is expected to be of type VelocityType.
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*/
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typedef typename POT::ParticleVelocityType VelocityType;
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/** Full constructor: Bounds and bound modifier required
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* @param _topology - The topology to get the global/local/other best
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* @param _c1 - The first learning factor used for the particle's best. Type must be POT::ParticleVelocityType
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* @param _c2 - The second learning factor used for the local/global best(s). Type must be POT::ParticleVelocityType
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* @param _bounds - An eoRealBaseVectorBounds: real bounds for real velocities.
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* If the velocities are not real, they won't be bounded by default. Should have a eoBounds ?
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* @param _boundsModifier - An eoRealBoundModifier used to modify the bounds (for real bounds only).
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* @param _gen - The eo random generator, default=rng
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*/
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eoFixedInertiaWeightedVelocity (eoTopology < POT > & _topology,
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const VelocityType _c1,
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const VelocityType _c2 ,
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eoRealVectorBounds & _bounds,
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eoRealBoundModifier & _bndsModifier,
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eoRng & _gen = rng):
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topology(_topology),
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c1 (_c1),
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c2 (_c2),
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bounds(_bounds),
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bndsModifier(_bndsModifier),
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gen(_gen){}
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/** Constructor: No bound updater required <-> fixed bounds
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* @param _topology - The topology to get the global/local/other best
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* @param _c1 - The first learning factor used for the particle's best. Type must be POT::ParticleVelocityType
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* @param _c2 - The second learning factor used for the local/global best(s). Type must be POT::ParticleVelocityType
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* @param _bounds - An eoRealBaseVectorBounds: real bounds for real velocities.
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* If the velocities are not real, they won't be bounded by default. Should have a eoBounds ?
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* @param _gen - The eo random generator, default=rng
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*/
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eoFixedInertiaWeightedVelocity (eoTopology < POT > & _topology,
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const VelocityType _c1,
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const VelocityType _c2,
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eoRealVectorBounds & _bounds,
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eoRng & _gen = rng):
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topology(_topology),
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c1 (_c1),
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c2 (_c2),
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bounds(_bounds),
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bndsModifier(dummyModifier),
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gen(_gen){}
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/** Constructor: Neither bounds nor bound updater required <-> free velocity
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* @param _topology - The topology to get the global/local/other best
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* @param _c1 - The first learning factor used for the particle's best. Type must be POT::ParticleVelocityType
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* @param _c2 - The second learning factor used for the local/global best(s). Type must be POT::ParticleVelocityType
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* @param _gen - The eo random generator, default=rng
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*/
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eoFixedInertiaWeightedVelocity (eoTopology < POT > & _topology,
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const VelocityType _c1,
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const VelocityType _c2,
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eoRng & _gen = rng):
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topology(_topology),
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c1 (_c1),
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c2 (_c2),
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bounds(*(new eoRealVectorNoBounds(0))),
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bndsModifier(dummyModifier),
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gen(_gen)
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{}
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/**
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* Evaluate the new velocities of the given particle. Need an indice to identify the particle
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* into the topology. Steps are :
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* - evaluate r1 and r2, the customed learning factors
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* - adjust the size of the bounds (even if dummy)
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* - modify the bounds with the bounds modifier (use the dummy modifier if there's no modifier provided)
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* @param _po - A particle
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* @param _indice - The indice (into the topology) of the given particle
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*/
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void operator () (POT & _po,unsigned _indice)
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{
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VelocityType r1;
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VelocityType r2;
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VelocityType newVelocity;
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// cast the learning factors to VelocityType
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r1 = (VelocityType) rng.uniform (1) * c1;
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r2 = (VelocityType) rng.uniform (1) * c2;
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// need to resize the bounds even if there are dummy because of "isBounded" call
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bounds.adjust_size(_po.size());
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// assign the new velocities
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for (unsigned j = 0; j < _po.size (); j++)
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{
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newVelocity= weight * _po.velocities[j] + r1 * (_po.bestPositions[j] - _po[j]) + r2 * (topology.best (_indice)[j] - _po[j]);
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/* modify the bounds */
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bndsModifier(bounds,j);
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/* check bounds */
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if (bounds.isMinBounded(j))
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newVelocity=(VelocityType)std::max(newVelocity,bounds.minimum(j));
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if (bounds.isMaxBounded(j))
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newVelocity=(VelocityType)std::min(newVelocity,bounds.maximum(j));
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_po.velocities[j]=(VelocityType)newVelocity;
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}
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}
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/**
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* Update the topology.
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*/
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void updateTopology(POT & _po,unsigned _indice)
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{
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topology.update(_po,_indice);
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}
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protected:
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eoTopology < POT > & topology;
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const VelocityType c1; // learning factor 1
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const VelocityType c2; // learning factor 2
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VelocityType weight; // the fixed weight
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eoRng & gen; // the random generator
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eoRealVectorBounds & bounds; // REAL bounds even if the velocity could be of another type.
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eoRealBoundModifier & bndsModifier;
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// If the bound modifier doesn't need to be used, use the dummy instance
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eoDummyRealBoundModifier dummyModifier;
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};
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#endif /*EOFIXEDINERTIAWEIGHTEDVELOCITY_H */
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