| /* |
| * Copyright (c) 2018 ARM Limited. |
| * |
| * SPDX-License-Identifier: MIT |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to |
| * deal in the Software without restriction, including without limitation the |
| * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| * sell copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in all |
| * copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| #include "arm_compute/graph/algorithms/TopologicalSort.h" |
| |
| #include "arm_compute/graph/Graph.h" |
| |
| #include "arm_compute/core/utils/misc/Iterable.h" |
| |
| #include <list> |
| #include <stack> |
| |
| namespace arm_compute |
| { |
| namespace graph |
| { |
| namespace detail |
| { |
| /** Checks if all the input dependencies of a node have been visited |
| * |
| * @param[in] node Node to check |
| * @param[in] visited Vector that contains the visited information |
| * |
| * @return True if all inputs dependencies have been visited else false |
| */ |
| inline bool all_inputs_are_visited(const INode *node, const std::vector<bool> &visited) |
| { |
| ARM_COMPUTE_ERROR_ON(node == nullptr); |
| const Graph *graph = node->graph(); |
| ARM_COMPUTE_ERROR_ON(graph == nullptr); |
| |
| bool are_all_visited = true; |
| for(const auto &input_edge_id : node->input_edges()) |
| { |
| if(input_edge_id != EmptyNodeID) |
| { |
| const Edge *input_edge = graph->edge(input_edge_id); |
| ARM_COMPUTE_ERROR_ON(input_edge == nullptr); |
| ARM_COMPUTE_ERROR_ON(input_edge->producer() == nullptr); |
| if(!visited[input_edge->producer_id()]) |
| { |
| are_all_visited = false; |
| break; |
| } |
| } |
| } |
| |
| return are_all_visited; |
| } |
| } // namespace detail |
| |
| std::vector<NodeID> bfs(Graph &g) |
| { |
| std::vector<NodeID> bfs_order_vector; |
| |
| // Created visited vector |
| std::vector<bool> visited(g.nodes().size(), false); |
| |
| // Create BFS queue |
| std::list<NodeID> queue; |
| |
| // Push inputs and mark as visited |
| for(auto &input : g.nodes(NodeType::Input)) |
| { |
| if(input != EmptyNodeID) |
| { |
| visited[input] = true; |
| queue.push_back(input); |
| } |
| } |
| |
| // Push const nodes and mark as visited |
| for(auto &const_node : g.nodes(NodeType::Const)) |
| { |
| if(const_node != EmptyNodeID) |
| { |
| visited[const_node] = true; |
| queue.push_back(const_node); |
| } |
| } |
| |
| // Iterate over vector and edges |
| while(!queue.empty()) |
| { |
| // Dequeue a node from queue and process |
| NodeID n = queue.front(); |
| bfs_order_vector.push_back(n); |
| queue.pop_front(); |
| |
| const INode *node = g.node(n); |
| ARM_COMPUTE_ERROR_ON(node == nullptr); |
| for(const auto &eid : node->output_edges()) |
| { |
| const Edge *e = g.edge(eid); |
| ARM_COMPUTE_ERROR_ON(e == nullptr); |
| if(!visited[e->consumer_id()] && detail::all_inputs_are_visited(e->consumer(), visited)) |
| { |
| visited[e->consumer_id()] = true; |
| queue.push_back(e->consumer_id()); |
| } |
| } |
| } |
| |
| return bfs_order_vector; |
| } |
| |
| std::vector<NodeID> dfs(Graph &g) |
| { |
| std::vector<NodeID> dfs_order_vector; |
| |
| // Created visited vector |
| std::vector<bool> visited(g.nodes().size(), false); |
| |
| // Create DFS stack |
| std::stack<NodeID> stack; |
| |
| // Push inputs and mark as visited |
| for(auto &input : g.nodes(NodeType::Input)) |
| { |
| if(input != EmptyNodeID) |
| { |
| visited[input] = true; |
| stack.push(input); |
| } |
| } |
| |
| // Push const nodes and mark as visited |
| for(auto &const_node : g.nodes(NodeType::Const)) |
| { |
| if(const_node != EmptyNodeID) |
| { |
| visited[const_node] = true; |
| stack.push(const_node); |
| } |
| } |
| |
| // Iterate over vector and edges |
| while(!stack.empty()) |
| { |
| // Pop a node from stack and process |
| NodeID n = stack.top(); |
| dfs_order_vector.push_back(n); |
| stack.pop(); |
| |
| // Mark node as visited |
| if(!visited[n]) |
| { |
| visited[n] = true; |
| } |
| |
| const INode *node = g.node(n); |
| ARM_COMPUTE_ERROR_ON(node == nullptr); |
| // Reverse iterate to push branches from right to left and pop on the opposite order |
| for(const auto &eid : arm_compute::utils::iterable::reverse_iterate(node->output_edges())) |
| { |
| const Edge *e = g.edge(eid); |
| ARM_COMPUTE_ERROR_ON(e == nullptr); |
| if(!visited[e->consumer_id()] && detail::all_inputs_are_visited(e->consumer(), visited)) |
| { |
| stack.push(e->consumer_id()); |
| } |
| } |
| } |
| |
| return dfs_order_vector; |
| } |
| } // namespace graph |
| } // namespace arm_compute |