make_genotype_real.h

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//-----------------------------------------------------------------------------
/** (c) Maarten Keijzer, Marc Schoenauer and GeNeura Team, 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: http://eodev.sourceforge.net
         [e-mail], http://geneura.ugr.es
         [e-mail]
         [e-mail]
*/


#ifndef EO_make_genotype_h
#define EO_make_genotype_h

#include <iostream>
#include <sstream>
#include <vector>

#include "es/eoReal.h"
#include "es/eoEsChromInit.h"
#include "utils/eoParser.h"
#include "utils/eoRealVectorBounds.h"
#include "utils/eoState.h"


/** Initialize genotype

This fuction does the initialization of what's needed for a particular genotype
(here, std::vector<double> == eoReal). It could be here tempatied only on the
fitness, as it can be used to evolve bitstrings with any fitness. However, for
consistency reasons, it was finally chosen, as in the rest of EO, to templatize
by the full EOT, as this eventually allows to choose the type of genotype at run
time (see in es dir)

It is instanciated in src/es/make_genotyupe_real.cpp and incorporated in the
src/es/libes.a

It returns an eoInit<EOT> tha can later be used to initialize the population
(see make_pop.h).

It uses a parser (to get user parameters) and a state (to store the memory) the
last argument is to disambiguate the call upon different instanciations.

@warning: that last argument will generally be the result of calling the default
ctor of EOT, resulting in most cases in an EOT that is ***not properly
initialized***
*/
template <class EOT>
eoEsChromInit<EOT> & do_make_genotype(eoParser& _parser, eoState& _state, EOT)
{
    // the fitness type
    typedef typename EOT::Fitness FitT;
    eoEsChromInit<EOT> *init;

    // for eoReal, only thing needed is the size - but might have been created elswhere ...
    eoValueParam<unsigned>& vecSize
        = _parser.getORcreateParam(unsigned(10), "vecSize",
                                   "The number of variables ",
                                   'n', "Genotype Initialization");
    // to build an eoReal Initializer, we need bounds: [-1,1] by default
    eoValueParam<eoRealVectorBounds>& boundsParam
        = _parser.getORcreateParam(eoRealVectorBounds(vecSize.value(), -1, 1),
                                   "initBounds",
                                   "Bounds for initialization (MUST be bounded)",
                                   'B', "Genotype Initialization");
    // now some initial value for sigmas - even if useless?
    // should be used in Normal mutation
    eoValueParam<std::string>& sigmaParam
        = _parser.getORcreateParam(std::string("0.3"), "sigmaInit",
                                   "Initial value for Sigmas (with a '%' -> scaled by the range of each variable)",
				   's', "Genotype Initialization");
    // check for %
    bool to_scale = false;
    size_t pos =  sigmaParam.value().find('%');
    if(pos < sigmaParam.value().size()) {
        //  found a % - use scaling and get rid of '%'
        to_scale = true;
        sigmaParam.value().resize(pos);
    }
    std::istringstream is(sigmaParam.value());
    double sigma;
    is >> sigma;
    // minimum check
    if(sigma < 0)
        throw std::runtime_error("Negative sigma in make_genotype");
    if(to_scale)
        init = new eoEsChromInit<EOT>(boundsParam.value(), sigma, to_scale);
    else {
        // define parameter
        eoValueParam<std::vector<double> >& vecSigmaParam
            = _parser.getORcreateParam(std::vector<double>(vecSize.value(), sigma), "vecSigmaInit",
                                       "Initial value for Sigmas (only used when initSigma is not scaled)",
                                       'S', "Genotype Initialization");
        init = new eoEsChromInit<EOT>(boundsParam.value(), vecSigmaParam.value());
    }
    // store in state
    _state.storeFunctor(init);
    return *init;
}

#endif // EO_make_genotype_h



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