Initial import of libdpf.

Co-authored-by: Cursor <cursoragent@cursor.com>

include/grotto/gadgets/activations/relu.hpp

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+/// @file grotto/gadgets/activations/relu.hpp
+/// @author Ryan Henry <ryan.henry@ucalgary.ca>
+/// @brief
+/// @copyright Copyright (c) 2019-2023 Ryan Henry and others
+/// @license Released under a GNU General Public v2.0 (GPLv2) license;
+///          see [LICENSE.md](@ref GPLv2) for details.
+
+#ifndef LIBDPF_INCLUDE_GROTTO_GADGETS_ACTIVATIONS_RELU_HPP__
+#define LIBDPF_INCLUDE_GROTTO_GADGETS_ACTIVATIONS_RELU_HPP__
+
+#include <cmath>
+#include <array>
+#include <limits>
+
+#include "leakyrelu.hpp"
+#include "grotto/gadget_hints.hpp"
+
+namespace grotto
+{
+
+namespace gadgets
+{
+
+using relu = leakyrelu<leakyrelu_zero_negative_slope>;
+
+}  // namespace gadgets
+
+}  // namespace grotto
+
+#endif  // LIBDPF_INCLUDE_GROTTO_GADGETS_ACTIVATIONS_RELU_HPP__