94 lines
2.6 KiB
C++
94 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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// eoSigBinaryFlight.h
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// (c) OPAC 2007, INRIA Futurs DOLPHIN
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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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clive.canape@inria.fr
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*/
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//-----------------------------------------------------------------------------
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#ifndef EOSIGBINARYFLIGHT_H
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#define EOSIGBINARYFLIGHT_H
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//-----------------------------------------------------------------------------
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#include <eoBinaryFlight.h>
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//-----------------------------------------------------------------------------
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/**
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* Binary flight for particle swarm optimization based on the sigmoid function. Velocities are expected to be "double"
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* Consider Pi to be the i-th position of a particle and Vi to be the i-th velocity of the same particle :
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* if rand[0;1] < sig(Vi) (Vi <=> double)
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* Pi=1
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* else
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* Pi=0
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*
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* @ingroup Variators
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*/
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template < class POT > class eoSigBinaryFlight:public eoBinaryFlight < POT >
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{
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public:
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/**
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* Constructor.
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*/
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eoSigBinaryFlight (){slope = 1;}
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eoSigBinaryFlight (unsigned _slope){slope = _slope;}
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/**
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* Sigmoid function
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*/
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double sigmoid( double _value)
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{
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return(1/(1+ exp(- _value/slope)));
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}
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/**
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* Apply the sigmoid binary flight to a particle.
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*
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*/
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void operator () (POT & _po)
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{
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for (unsigned j = 0; j < _po.size (); j++)
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{
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double sigma=rng.uniform(1);
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if (sigma < sigmoid(_po.velocities[j]))
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_po[j]=1;
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else
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_po[j]=0;
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}
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// invalidate the fitness because the positions have changed
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_po.invalidate();
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}
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private :
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unsigned slope;
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};
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#endif /*EOSIGBINARYFLIGHT_H */
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