77 lines
2.6 KiB
C++
77 lines
2.6 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoLinearDecreasingWeightUp.h
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// (c) OPAC 2007
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/*
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Contact: thomas.legrand@lifl.fr
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*/
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//-----------------------------------------------------------------------------
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#ifndef EOLINEARDECREASINGWEIGHTUP_H
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#define EOLINEARDECREASINGWEIGHTUP_H
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//-----------------------------------------------------------------------------
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#include <eoWeightUpdater.h>
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//-----------------------------------------------------------------------------
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/**
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* Linear (inertia) weight updater for particle swarm optimization. Update a weight according to:
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* w(t)=(w(0)-w(Nt))*(Nt -t)/Nt + w(Nt) where
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* t is the current generation/event
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* Nt is the total number of generations/event
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* w(0) is the initial weight
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* w(Nt) is the last inertia weight
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*
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* @ingroup Variators
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*/
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template <class WeightType, class StopCriteriaType> class eoLinearDecreasingWeightUp:public eoWeightUpdater<WeightType>
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{
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public:
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/**
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* Ctor
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*/
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eoLinearDecreasingWeightUp(
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const StopCriteriaType & _stop,
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const WeightType & _initialValue,
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const WeightType & _finalValue,
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eoValueParam<StopCriteriaType> & _counter):
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stop(_stop),
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initialValue(_initialValue),
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finalValue(_finalValue),
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counter(_counter){}
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/**
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* Update the given weight
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*/
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void operator() (WeightType & _weight)
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{
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_weight=(initialValue-finalValue)* (WeightType)(stop-counter.value())/(WeightType)stop + finalValue;
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}
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protected:
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const StopCriteriaType & stop;
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const WeightType & initialValue,finalValue;
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eoValueParam<StopCriteriaType> & counter; // a counter of the number of past events (should say "generations")
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};
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#endif/*EOLINEARDECREASINGWEIGHTUP_H*/
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