Feat: introduced simulated annealing

deferred_planarity_test/main.cpp

@@ -21,6 +21,44 @@ int compute_removed_edge_size(string input_file, vector<int> post_order);
 vector<int> generate_post_order(string input_file);
 vector<int> generate_mutated_post_order(string input_file, vector<int> post_order);
 
+double temp_decay(int k, int k_max) {
+    return 1.0 - ((k + 1.0) / (k_max));
+}
+
+vector<int> sa_solve(string input_file, int k_max) {
+
+    // create sampling function
+    std::random_device rd;
+    std::mt19937 rng(rd());
+    std::uniform_real_distribution<> distribution(0.0, 1.0);
+
+    // generate first state
+    vector<int> state_old = generate_post_order(input_file);
+    vector<int> state_new;
+    int e_old = compute_removed_edge_size(input_file, state_old);
+    int e_new = 0;
+    int delta = 0;
+    // initialize terms
+    double temp = 100;
+
+    for (int k = 0; k < k_max; ++k) {
+        temp = temp_decay(k, k_max);
+
+        state_new = generate_mutated_post_order(input_file, state_old);
+        e_new = compute_removed_edge_size(input_file, state_new);
+        delta = e_new - e_old;
+
+        if (std::exp( -(delta) / temp) > distribution(rng)) {
+           state_old = state_new; 
+           e_old = e_new;
+        }
+        // std::cout << "temp: " << temp << ", score: " << e_old << std::endl;
+    }
+
+    return state_old;
+
+}
+
 int get_graph_size(string input_file) {
     ogdf::Graph G;
 
@@ -39,23 +77,17 @@ int get_graph_size(string input_file) {
 
 int main(int argc, char* argv[]) {
     string input_file = argv[1];
+    int k_max = std::stoi(argv[2]);
 
     // generate order here
-    vector<int> post_order = generate_post_order(input_file);
+    vector<int> post_order = sa_solve(input_file, k_max);
-    std::copy(post_order.begin(), post_order.end(), std::ostream_iterator<int>(std::cout, " "));
-    std::cout << std::endl;
-
-    // generate mutated order
-    vector<int> mutated_order = generate_mutated_post_order(input_file, post_order);
-    post_order = mutated_order;
-    std::copy(post_order.begin(), post_order.end(), std::ostream_iterator<int>(std::cout, " "));
-    std::cout << std::endl;
 
+    // std::copy(post_order.begin(), post_order.end(), std::ostream_iterator<int>(std::cout, " "));
+    // std::cout << std::endl;
 
     // print order
     int removed_edges = compute_removed_edge_size(input_file, post_order);
     std::cout << "Number of removed edges: " << removed_edges << std::endl;
 
-
 	return 0;
 }

deferred_planarity_test/mps.cpp

@@ -91,7 +91,7 @@ maximal_planar_subgraph_finder::mutatedPostOrderTraversal(vector<int> post_order
     std::uniform_int_distribution<int> distribution(0, n);
     // Generate a random number between 0 and n (inclusive)
     int mutate_point = distribution(rng);
-    std::cout << "the mutate point: " << mutate_point << std::endl;
+    // std::cout << "the mutate point: " << mutate_point << std::endl;
 
     // set loop variables
     int start = rev_post_order[0];

deferred_planarity_test/mps_test.cpp

@@ -65,12 +65,12 @@ int maximal_planar_subgraph_finder::compute_removed_edge_size(string input_file,
         _node_list[_post_order_list[i]->node_id()]->set_post_order_index(i);
     }
 
-    std::cout << "check order of duplicated traversal" << std::endl;
+    // std::cout << "check order of duplicated traversal" << std::endl;
-    for (int i = 0; i < _post_order_list.size(); ++i) {
+    // for (int i = 0; i < _post_order_list.size(); ++i) {
-        std::cout << _post_order_list[i]->node_id() << " ";
+    //     std::cout << _post_order_list[i]->node_id() << " ";
-    }
+    // }
+    // std::cout << std::endl;
 
-    std::cout << std::endl;
 	sort_adj_list();
 	determine_edges();
 	back_edge_traversal();

deferred_planarity_test/node.cpp

@@ -124,11 +124,11 @@ void node::mutated_DFS_visit(vector<node*> &dfsList, vector<node*> &node_list, i
     }
 
     // print the neighbors
-    std::cout << "current index: " << this->node_id() << std::endl;
+    // std::cout << "current index: " << this->node_id() << std::endl;
-    for (int i = 0; i < neighbor_list.size(); ++i) {
+    // for (int i = 0; i < neighbor_list.size(); ++i) {
-        std::cout << neighbor_list[i]->node_id() << " ";
+    //     std::cout << neighbor_list[i]->node_id() << " ";
-    }
+    // }
-    std::cout << std::endl;
+    // std::cout << std::endl;
 
 	set_post_order_index(index);
 	dfsList.push_back(this);
@@ -136,19 +136,19 @@ void node::mutated_DFS_visit(vector<node*> &dfsList, vector<node*> &node_list, i
 
     if (index - 1 == mutate_point) {
         // Create a random number generator and seed it
-        std::cout << "mutated at index: " << index - 1<< "and at mutate point: " << mutate_point << std::endl;
+        // std::cout << "mutated at index: " << index - 1<< "and at mutate point: " << mutate_point << std::endl;
         std::random_device rd;
         std::mt19937 rng(rd());
         // Use std::shuffle to shuffle the elements in the vector
         std::shuffle(neighbor_list.begin(), neighbor_list.end(), rng);
-        // print the neighbors
+        // // print the neighbors
-        std::cout << "order after mutation: " << std::endl;
+        // std::cout << "order after mutation: " << std::endl;
-        std::cout << "current index: " << this->node_id() << std::endl;
+        // std::cout << "current index: " << this->node_id() << std::endl;
-        for (int i = 0; i < neighbor_list.size(); ++i)
+        // for (int i = 0; i < neighbor_list.size(); ++i)
-        {
+        // {
-            std::cout << neighbor_list[i]->node_id() << " ";
+        //     std::cout << neighbor_list[i]->node_id() << " ";
-        }
+        // }
-        std::cout << std::endl;
+        // std::cout << std::endl;
     } 
     
     for (int i = 0; i < neighbor_list.size(); ++i)