53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
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/// @file grotto/gadgets/activations/hardshrink.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_HARDSHRINK_HPP__
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#define LIBDPF_INCLUDE_GROTTO_GADGETS_ACTIVATIONS_HARDSHRINK_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 hardshrink_default_lambda = 0.5;
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template <double const & lambda = hardshrink_default_lambda>
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struct hardshrink
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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 (std::abs(x) <= lambda) return 0;
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return x;
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}
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};
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template <double const & lambda>
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struct gadget_hints<hardshrink<lambda>>
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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[] = { -lambda, lambda };
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static constexpr unsigned degree = 1;
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static constexpr bool has_canonical_representation = true;
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static constexpr double canonical_bounds[] = { -lambda, lambda };
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static constexpr std::array<double, degree+1> canonical_polys[] = { {0,1}, {0}, {0,1} };
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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_HARDSHRINK_HPP__
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