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af.hpp
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af.hpp
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//| This file is a part of the sferes2 framework.
//| Copyright 2009, ISIR / Universite Pierre et Marie Curie (UPMC)
//| Main contributor(s): Jean-Baptiste Mouret, mouret@isir.fr
//|
//| This software is a computer program whose purpose is to facilitate
//| experiments in evolutionary computation and evolutionary robotics.
//|
//| This software is governed by the CeCILL license under French law
//| and abiding by the rules of distribution of free software. You
//| can use, modify and/ or redistribute the software under the terms
//| of the CeCILL license as circulated by CEA, CNRS and INRIA at the
//| following URL "http://www.cecill.info".
//|
//| As a counterpart to the access to the source code and rights to
//| copy, modify and redistribute granted by the license, users are
//| provided only with a limited warranty and the software's author,
//| the holder of the economic rights, and the successive licensors
//| have only limited liability.
//|
//| In this respect, the user's attention is drawn to the risks
//| associated with loading, using, modifying and/or developing or
//| reproducing the software by the user in light of its specific
//| status of free software, that may mean that it is complicated to
//| manipulate, and that also therefore means that it is reserved for
//| developers and experienced professionals having in-depth computer
//| knowledge. Users are therefore encouraged to load and test the
//| software's suitability as regards their requirements in conditions
//| enabling the security of their systems and/or data to be ensured
//| and, more generally, to use and operate it in the same conditions
//| as regards security.
//|
//| The fact that you are presently reading this means that you have
//| had knowledge of the CeCILL license and that you accept its terms.
#ifndef _NN_AF_HPP_
#define _NN_AF_HPP_
#include "params.hpp"
// classic activation functions
namespace nn {
template <typename P = params::Dummy>
class Af {
public:
typedef P params_t;
const params_t& get_params() const {
return _params;
}
params_t& get_params() {
return _params;
}
void set_params(const params_t& params) {
_params = params;
}
void init() {}
Af() {}
protected:
params_t _params;
};
// -1 to +1 sigmoid
template <typename P>
struct AfTanh : public Af<P> {
typedef P params_t;
BOOST_STATIC_CONSTEXPR float lambda = 5.0f;
AfTanh() {
assert(trait<P>::size(this->_params) == 1);
}
float operator()(float p) const {
return tanh(p * lambda + trait<P>::single_value(this->_params));
}
protected:
};
// -1 to +1 sigmoid
template <typename P = float>
struct AfTanhNoBias : public Af<P> {
typedef params::Dummy params_t;
BOOST_STATIC_CONSTEXPR float lambda = 5.0f;
AfTanhNoBias() { }
float operator()(float p) const {
return tanh(p * lambda);
}
};
template <typename P = float>
struct AfSigmoidNoBias : public Af<> {
typedef params::Dummy params_t;
BOOST_STATIC_CONSTEXPR float lambda = 5.0f;
AfSigmoidNoBias() { }
float operator()(float p) const {
return 1.0 / (exp(-p * lambda) + 1);
}
protected:
};
template <typename P = float>
struct AfSigmoidBias : public Af<P> {
typedef P params_t;
BOOST_STATIC_CONSTEXPR float lambda = 5.0f;
AfSigmoidBias() {
assert(this->_params.size() == 1);
}
float operator()(float p) const {
return 1.0 / (exp(-p + trait<P>::single_value(this->_params) * lambda) + 1);
}
protected:
};
// copy input to output
// store an arbitrary parameter
template<typename P = params::Dummy>
struct AfDirect : public Af<P> {
typedef P params_t;
float operator()(float p) const {
return p;
}
};
// copy input to output
template<typename T>
struct AfDirectT : public Af<params::Dummy> {
typedef params::Dummy params_t;
T operator()(T p) const {
return p;
}
};
}
#endif