71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoGaussRealWeightUp.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 EOGAUSSREALWEIGHTUP_H
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#define EOGAUSSREALWEIGHTUP_H
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//-----------------------------------------------------------------------------
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#include <eoWeightUpdater.h>
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#include <utils/eoRNG.h>
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//-----------------------------------------------------------------------------
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/**
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* Update an inertia weight by assigning it a Gaussian randomized value
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* (used for the velocity in particle swarm optimization).
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*
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* @ingroup Variators
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*/
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class eoGaussRealWeightUp:public eoWeightUpdater<double>
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{
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public:
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/**
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* Default constructor
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* @param _mean - Mean for Gaussian distribution
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* @param _stdev - Standard deviation for Gaussian distribution
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*/
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eoGaussRealWeightUp(
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double _mean=0,
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double _stdev=1.0
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):mean(_mean),stdev(_stdev){}
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/**
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* Assign Gaussian deviation to _weight
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* @param _weight - The modified weight as a double
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*/
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void operator() (double & _weight)
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{
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_weight=rng.normal(mean,stdev);
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}
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protected:
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double mean,stdev;
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};
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#endif/*EOGAUSSREALWEIGHTUP_H*/
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