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#pragma once
#include <cstdint>
#include <functional>
#include <memory>
#include <c10/util/hash.h>
namespace torch::autograd {
struct Node;
/// Represents a particular input of a function.
struct Edge {
Edge() noexcept : function(nullptr), input_nr(0) {}
Edge(std::shared_ptr<Node> function_, uint32_t input_nr_) noexcept
: function(std::move(function_)), input_nr(input_nr_) {}
/// Convenience method to test if an edge is valid.
bool is_valid() const noexcept {
return function != nullptr;
}
// Required for use in associative containers.
bool operator==(const Edge& other) const noexcept {
return this->function == other.function && this->input_nr == other.input_nr;
}
bool operator!=(const Edge& other) const noexcept {
return !(*this == other);
}
/// The function this `Edge` points to.
std::shared_ptr<Node> function;
/// The identifier of a particular input to the function.
uint32_t input_nr;
};
} // namespace torch::autograd
// The idiomatic way of enabling use of a custom type as the key of hash
// containers in C++11. This method removes the requirement of having to pass
// a custom hasher to std::unordered_{map, set}.
// See http://en.cppreference.com/w/cpp/utility/hash for more information.
namespace std {
template <>
struct hash<torch::autograd::Edge> {
// These type aliases are required by the standard.
using argument_type = torch::autograd::Edge;
using return_type = size_t;
return_type operator()(const argument_type& edge) const noexcept {
return c10::get_hash(edge.function, edge.input_nr);
}
};
} // namespace std
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