53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
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/// @file grotto/gadgets/activations/softplus.hpp
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/// @author Ryan Henry <ryan.henry@ucalgary.ca>
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/// @brief
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/// @copyright Copyright (c) 2019-2023 Ryan Henry and others
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/// @license Released under a GNU General Public v2.0 (GPLv2) license;
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/// see [LICENSE.md](@ref GPLv2) for details.
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#ifndef LIBDPF_INCLUDE_GROTTO_GADGETS_ACTIVATIONS_SOFTPLUS_HPP__
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#define LIBDPF_INCLUDE_GROTTO_GADGETS_ACTIVATIONS_SOFTPLUS_HPP__
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#include <cmath>
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#include <array>
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#include <limits>
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#include "grotto/gadget_hints.hpp"
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namespace grotto
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{
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namespace gadgets
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{
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static constexpr double softplus_default_beta = 1;
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template <double const & beta = softplus_default_beta>
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struct softplus
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{
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template <typename T>
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T operator()(T x)
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{
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if (x > 20) return x*beta;
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return (std::log1p(std::exp(beta*x)))/beta;
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}
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};
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template <double const & beta>
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struct gadget_hints<softplus<beta>>
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{
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static constexpr double min = std::numeric_limits<double>::min();
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static constexpr double max = std::numeric_limits<double>::max();
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static constexpr double poles[] = { };
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static constexpr double interesting_points[] = { 20 };
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static constexpr unsigned degree = 3;
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static constexpr bool has_canonical_representation = false;
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static constexpr double canonical_bounds[] = { };
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static constexpr std::array<double, degree+1> canonical_polys[] = { };
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};
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} // namespace gadgets
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} // namespace grotto
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#endif // LIBDPF_INCLUDE_GROTTO_GADGETS_ACTIVATIONS_SOFTPLUS_HPP__
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