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Adding PBIL files - simple PBIL algorithm with simple additive update rule

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evomarc 2001-11-08 06:49:38 +00:00
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eo/src/ga/eoPBILDistrib.h Normal file
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// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
//-----------------------------------------------------------------------------
// eoPBILDistrib.h
// (c) Marc Schoenauer, 2001
/*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Contact: Marc.Schoenauer@inria.fr
*/
//-----------------------------------------------------------------------------
#ifndef _eoPBILDistrib_H
#define _eoPBILDistrib_H
#include <eoDistribution.h>
/**
* Distribution Class for PBIL algorithm
* (Population-Based Incremental Learning, Baluja and Caruana 96)
*
* It encodes a univariate distribution on the space of bitstrings,
* i.e. one probability for each bit to be one
*
* It is an eoValueParam<vector<double> > :
* the vector<double> stores the probabilities that each bit is 1
*
* It is still pure virtual, as the update method needs to be specified
*/
template <class EOT>
class eoPBILDistrib : public eoDistribution<EOT>,
public eoValueParam<vector<double> >
{
public:
/** Ctor with size of genomes, and update parameters */
eoPBILDistrib(unsigned _genomeSize) :
eoDistribution<EOT>(),
eoValueParam<vector<double> >(vector<double>(_genomeSize, 0.5), "Distribution"),
genomeSize(_genomeSize)
{}
/** the randomizer of indis */
virtual void operator()(EOT & _eo)
{
_eo.resize(genomeSize); // just in case
for (unsigned i=0; i<genomeSize; i++)
_eo[i] = eo::rng.flip(value()[i]);
_eo.invalidate(); // DO NOT FORGET!!!
}
/** update method - still PURE VIRTUAL */
// virtual void update(eoPop<EOT>&) = 0; // update from a population
/** Accessor to the genome size */
unsigned Size() {return genomeSize;}
/** printing... */
virtual void printOn(ostream& os) const
{
os << value().size() << ' ';
for (unsigned i=0; i<value().size(); i++)
os << value()[i] << ' ';
}
/** reading...*/
virtual void readFrom(istream& is)
{
unsigned sz;
is >> sz;
value().resize(sz);
unsigned i;
for (i = 0; i < sz; ++i)
{
double atom;
is >> atom;
value()[i] = atom;
}
}
unsigned int size() {return genomeSize;}
virtual string className() const {return "eoPBILDistrib";};
private:
unsigned genomeSize; // size of indis
};
#endif