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Feat: merge with read_once branch 

- performance improvements from optimizing multiple procedures
This commit is contained in:
Richard Wong 2024-03-06 14:26:49 +09:00
parent e35462ef2d
commit aa3c3e3b20
Signed by: richard
GPG Key ID: 5BD36BA2E9EE33D0
6 changed files with 342 additions and 221 deletions
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46
deferred_planarity_test/include/mps.h
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@ -10,9 +10,12 @@
#include <vector> #include <vector>
#include <utility> #include <utility>
#include <climits> #include <climits>
#include <limits>
#include <random> #include <random>
#include <algorithm> #include <algorithm>
#include <unordered_map>
#include <unordered_set> #include <unordered_set>
#include <ogdf/fileformats/GraphIO.h>
using namespace std; using namespace std;
@ -57,16 +60,19 @@ public:
void set_adj_list(vector<node*> vec); void set_adj_list(vector<node*> vec);
void DFS_visit(vector<node*> &dfsList, int &index); void DFS_visit(vector<node*> &dfsList, int &index);
void guided_DFS_visit(vector<node *> &dfsList, void guided_DFS_visit(vector<node *> &dfsList,
vector<node *> &node_list, const vector<node *> &node_list,
int &return_index, int &return_index,
vector<int> rev_post_order, const unordered_map<int, int> &node_id_to_pos);
int prev_node);
void mutated_DFS_visit(vector<node *> &dfsList, void mutated_DFS_visit(vector<node *> &dfsList,
vector<node*> &node_list, const vector<node *> &node_list,
int &index, int &index,
int &traversal_index, int &traversal_index,
vector<int> rev_post_order, const unordered_map<int, int> &node_id_to_pos,
int mutate_point); int mutate_point,
mt19937 rng);
// custom comparator function to sort nodes according to order in given vector
bool sortByOrder(const unordered_map<int, int>& node_id_to_pos, node* a, node* b);
//PARENT-CHILDREN //PARENT-CHILDREN
void set_parent(node* n) ; void set_parent(node* n) ;
@ -155,18 +161,26 @@ class maximal_planar_subgraph_finder
public: public:
maximal_planar_subgraph_finder(); maximal_planar_subgraph_finder();
~maximal_planar_subgraph_finder(); ~maximal_planar_subgraph_finder();
int find_mps(string input_file);
int compute_removed_edge_size(string input_file, vector<int> post_order); // functions that prepare state
vector<int> generate_post_order(string input_file); void init_from_graph(const ogdf::Graph &G);
vector<int> generate_mutated_post_order(string input_file, vector<int> post_order, int mutate_point); vector<int> generate_post_order(const ogdf::Graph &G);
vector<int> generate_guided_post_order(string input_file, vector<int> post_order); vector<int> generate_mutated_post_order(const ogdf::Graph &G, const vector<int> &post_order, int mutate_point);
vector<int> generate_guided_post_order(const ogdf::Graph &G, const vector<int> &post_order);
void postOrderTraversal();
void guidedPostOrderTraversal(const vector<int> &post_order);
void mutatedPostOrderTraversal(const vector<int> &post_order, int mutate_point);
// compute_mps combines functionality to reduce repeating object initialization
// the results are returned by modifying mutable reference
void compute_mps(const ogdf::Graph &G, int mutate_point, vector<int> &post_order, int &return_edge_size);
int find_mps(const ogdf::Graph &G);
int compute_removed_edge_size(const ogdf::Graph &G, vector<int> post_order);
node* get_new_node(node_type t); node* get_new_node(node_type t);
void read_from_gml(string input_file); void reset_state();
int output_removed_edge_size(); int output_removed_edge_size();
vector<int> return_post_order(); vector<int> return_post_order();
void postOrderTraversal();
void guidedPostOrderTraversal(vector<int> post_order);
void mutatedPostOrderTraversal(vector<int> post_order, int mutate_point);
// void set_post_order(vector<int> post_order); // void set_post_order(vector<int> post_order);
void print_post_order(); void print_post_order();
void sort_adj_list(); void sort_adj_list();
@ -198,4 +212,4 @@ private:
vector<node*> _new_node_list; //Newly added nodes. vector<node*> _new_node_list; //Newly added nodes.
}; };
#endif #endif // for MPS_H

2
deferred_planarity_test/makefile
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@ -31,4 +31,4 @@ $(BIN_DIR) $(OBJ_DIR):
.PHONY: clean .PHONY: clean
clean: clean:
rm -r $(BIN_DIR) $(OBJ_DIR) rm -r $(OBJ_DIR)

107
deferred_planarity_test/src/main.cpp
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@ -14,68 +14,73 @@
#include <ogdf/fileformats/GraphIO.h> #include <ogdf/fileformats/GraphIO.h>
#define START_TEMP 100 #define START_TEMP 100
// #define TIME
using namespace std; using namespace std;
int compute_removed_edge_size(string input_file, vector<int> post_order); int compute_removed_edge_size(const ogdf::Graph &G, vector<int> post_order);
// these functions are defined in mps_test.cpp // these functions are defined in mps_test.cpp
// but their signatures are not in mps.h, hence they are declared here // but their signatures are not in mps.h, hence they are declared here
vector<int> generate_post_order(string input_file); ogdf::Graph read_from_gml(string input_file);
vector<int> generate_mutated_post_order(string input_file, vector<int> post_order, int mutate_point); vector<int> generate_post_order(const ogdf::Graph &G);
vector<int> generate_guided_post_order(string input_file, vector<int> post_order); vector<int> generate_mutated_post_order(const ogdf::Graph &G, vector<int> post_order, int mutate_point);
vector<int> generate_guided_post_order(const ogdf::Graph &G, vector<int> post_order);
void compute_mps(const ogdf::Graph &G, int mutate_point, vector<int> &post_order, int &return_edge_size);
void vector_printer(vector<int> state) { void vector_printer(const vector<int>& state) {
for (int i = 0; i < state.size(); ++i) { for (size_t i = 0; i < state.size(); ++i) {
std::cout << state[i] << ","; std::cout << state[i] << ",";
} }
std::cout << std::endl; std::cout << std::endl;
} }
vector<int> repeated_mutation(string input_file, int k_max, int mutate_point) { vector<int> repeated_mutation(const ogdf::Graph &G, int k_max) {
// generate first post order // generate first post order
std::cout << "generate first post order" << std::endl; // std::cout << "generate first post order" << std::endl;
vector<int> state_old = generate_post_order(input_file); vector<int> old_order = generate_post_order(G);
vector<int> state_new; vector_printer(old_order);
vector<int> temp_order = old_order;
int new_removed_size;
int old_removed_size = INT_MAX;
// prepare random selection
std::random_device rd;
std::mt19937 gen{rd()}; // seed the generator
int first_value = 0;
// we want the index of the third last value
// at a given traversal index, only the next iteration has the mutated value
int last_value = (old_order.size() - 1) - 2;
std::uniform_int_distribution<> dist{first_value, last_value}; // set min and max
for (int k = 0; k < k_max; ++k) { for (int k = 0; k < k_max; ++k) {
std::cout << "cycle:" << k << std::endl; // function compute new post_order and new_removed_size
// temp_order and new_removed_size will be updated with new values
vector_printer(state_old); #ifdef TIME
auto start = std::chrono::high_resolution_clock::now();
#endif
compute_mps(G, dist(gen), temp_order, new_removed_size);
#ifdef TIME
auto end = std::chrono::high_resolution_clock::now();
std::cout << "compute_mps: " << std::chrono::duration_cast<std::chrono::microseconds>(end - start).count() << std::endl;
#endif
// if there is an improvement
// mutation produces rotated view // 1. update the removed size to use the new smaller size
state_new = generate_mutated_post_order(input_file, state_old, mutate_point); // 2. update the old_order to be the new_order
vector_printer(state_new); if (new_removed_size < old_removed_size) {
old_removed_size = new_removed_size;
// another round of guided post order gives canonical representation old_order = temp_order;
state_new = generate_guided_post_order(input_file, state_new); // if there is no improvement, we revert the temp_order to the old_order
vector_printer(state_new); } else {
temp_order = old_order;
std::cout << std::endl;
} }
return state_new; }
return old_order;
} }
void test_correctness(string input_file) {
vector<int> state_old = generate_post_order(input_file);
int num_removed_edges;
num_removed_edges = compute_removed_edge_size(input_file, state_old);
}
int get_graph_size(string input_file) {
ogdf::Graph G;
// utilize OGDF readGML
if (!ogdf::GraphIO::read(G, input_file, ogdf::GraphIO::readGML)) {
std::cerr << "Could not read " << input_file << ".gml" << std::endl;
}
return G.numberOfNodes();
}
//----------------------------------------------------------------------------------- //-----------------------------------------------------------------------------------
// Main function. // Main function.
@ -85,18 +90,22 @@ int get_graph_size(string input_file) {
int main(int argc, char* argv[]) { int main(int argc, char* argv[]) {
string input_file = argv[1]; string input_file = argv[1];
int k_max = std::stoi(argv[2]); int k_max = std::stoi(argv[2]);
int mutate_point = std::stoi(argv[3]);
const ogdf::Graph G = read_from_gml(input_file);
// generate order here // generate order here
vector<int> post_order = repeated_mutation(input_file, k_max, mutate_point); vector<int> post_order = repeated_mutation(G, k_max);
// test_correctness(input_file);
// test timing of function
// test_correctness(G);
// // print final order and number of edges // // print final order and number of edges
// // print post_order std::cout << "---" << std::endl;
// std::copy(post_order.begin(), post_order.end(), std::ostream_iterator<int>(std::cout, ",")); std::cout << "final report" << std::endl;
// std::cout << std::endl; std::copy(post_order.begin(), post_order.end(), std::ostream_iterator<int>(std::cout, ","));
// int removed_edges = compute_removed_edge_size(input_file, post_order); std::cout << std::endl;
// std::cout << "Number of removed edges: " << removed_edges << std::endl; int removed_edges = compute_removed_edge_size(G, post_order);
std::cout << "Number of removed edges: " << removed_edges << std::endl;
return 0; return 0;
} }

126
deferred_planarity_test/src/mps.cpp
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@ -3,7 +3,6 @@
//----------------------------------------------------------------------------------- //-----------------------------------------------------------------------------------
#include "mps.h" #include "mps.h"
#include <iterator>
// #define DEBUG // #define DEBUG
@ -12,8 +11,8 @@ maximal_planar_subgraph_finder::maximal_planar_subgraph_finder() {}
//Destructor //Destructor
maximal_planar_subgraph_finder::~maximal_planar_subgraph_finder() { maximal_planar_subgraph_finder::~maximal_planar_subgraph_finder() {
for (int i = 0; i < _node_list.size(); ++i) delete _node_list[i]; for (size_t i = 0; i < _node_list.size(); ++i) delete _node_list[i];
for (int i = 0; i < _new_node_list.size(); ++i) delete _new_node_list[i]; for (size_t i = 0; i < _new_node_list.size(); ++i) delete _new_node_list[i];
} }
node* node*
@ -25,7 +24,9 @@ maximal_planar_subgraph_finder::get_new_node(node_type t) {
vector<int> vector<int>
maximal_planar_subgraph_finder::return_post_order() { maximal_planar_subgraph_finder::return_post_order() {
vector<int> post_order; vector<int> post_order;
for (int i = 0; i < _post_order_list.size(); ++i) { // we have arg number of elements
post_order.reserve(_post_order_list.size()); // reserve for decreased reallocation
for (size_t i = 0; i < _post_order_list.size(); ++i) {
post_order.push_back(_post_order_list[i]->node_id()); post_order.push_back(_post_order_list[i]->node_id());
} }
return post_order; return post_order;
@ -37,7 +38,7 @@ maximal_planar_subgraph_finder::postOrderTraversal() {
node::init_mark(); node::init_mark();
// always start with node 0 // always start with node 0
int postOrderID = 0; int postOrderID = 0;
for (int i = 0; i < _node_list.size(); ++i) { for (size_t i = 0; i < _node_list.size(); ++i) {
if (!_node_list[i]->is_marked()) { if (!_node_list[i]->is_marked()) {
_node_list[i]->DFS_visit(_post_order_list, postOrderID); _node_list[i]->DFS_visit(_post_order_list, postOrderID);
} }
@ -49,33 +50,49 @@ maximal_planar_subgraph_finder::postOrderTraversal() {
// take in a post-order argument then traces the graph in the same order // take in a post-order argument then traces the graph in the same order
// return is by reference via _post_order_list // return is by reference via _post_order_list
void void
maximal_planar_subgraph_finder::guidedPostOrderTraversal(vector<int> post_order) { maximal_planar_subgraph_finder::guidedPostOrderTraversal(const vector<int> &post_order) {
node::init_mark(); node::init_mark();
vector<int> rev_post_order; // // implementation 1: pass reversed vector
for (int i = post_order.size() - 1; i >= 0; --i) { // vector<int> rev_post_order;
rev_post_order.push_back(post_order[i]); // for (int i = post_order.size() - 1; i >= 0; --i) {
} // rev_post_order.push_back(post_order[i]);
int postOrderID = 0; // }
// int start = rev_post_order[0];
// implementation 2: use unordered_map to map node_id to position in reversed post_order
unordered_map<int, int> node_id_to_pos;
node_id_to_pos.reserve(post_order.size());
int j = 0;
// we flip the post_order vector around
for (size_t i = post_order.size() - 1; i != std::numeric_limits<size_t>::max(); --i) {
node_id_to_pos[post_order[i]] = j++;
}
int postOrderID = 0;
int end_condition = _node_list.size(); int end_condition = _node_list.size();
int start = rev_post_order[0]; // we start from the end of the post_order, which is the root node
int start = post_order[post_order.size() - 1];
int i = start; int i = start;
int prev_node = INT_MAX; // reserve for _post_order_list to decrease reallocation
_post_order_list.reserve(_node_list.size());
while (true) while (true)
{ {
if (((start > 0) && (i == (start - 1))) || ((start == 0 ) && (i == end_condition - 1))) if (((start > 0) && (i == (start - 1))) || ((start == 0 ) && (i == end_condition - 1)))
{ {
if (!_node_list[i]->is_marked()) if (!_node_list[i]->is_marked())
{ {
_node_list[i]->guided_DFS_visit(_post_order_list, _node_list, postOrderID, rev_post_order, prev_node); _node_list[i]->guided_DFS_visit(_post_order_list, _node_list, postOrderID, node_id_to_pos);
} }
break; break;
} }
if (!_node_list[i]->is_marked()) if (!_node_list[i]->is_marked())
{ {
_node_list[i]->guided_DFS_visit(_post_order_list, _node_list, postOrderID, rev_post_order, prev_node); _node_list[i]->guided_DFS_visit(_post_order_list, _node_list, postOrderID, node_id_to_pos);
} }
i = (i + 1) % end_condition; i = (i + 1) % end_condition;
} }
@ -85,23 +102,50 @@ maximal_planar_subgraph_finder::guidedPostOrderTraversal(vector<int> post_order)
// take in a post-order argument then traces the graph in the same order // take in a post-order argument then traces the graph in the same order
// return is by reference via _post_order_list // return is by reference via _post_order_list
void void
maximal_planar_subgraph_finder::mutatedPostOrderTraversal(vector<int> post_order, int mutate_point) { maximal_planar_subgraph_finder::mutatedPostOrderTraversal(const vector<int> &post_order, int mutate_point) {
node::init_mark(); node::init_mark();
vector<int> rev_post_order; // // implementation 1: use vector
for (int i = post_order.size() - 1; i >= 0; --i) { // vector<int> rev_post_order;
rev_post_order.push_back(post_order[i]); // for (size_t i = post_order.size() - 1; i != std::numeric_limits<size_t>::max(); --i) {
// rev_post_order.push_back(post_order[i]);
// }
// implementation 2: use unordered_map to map node_id to position in reversed post_order
unordered_map<int, int> node_id_to_pos;
node_id_to_pos.reserve(post_order.size());
int j = 0;
// we flip the post_order vector around
for (size_t i = post_order.size() - 1; i != std::numeric_limits<size_t>::max(); --i) {
node_id_to_pos[post_order[i]] = j++;
} }
int postOrderID = 0; int postOrderID = 0;
int traversal_index = 0; int traversal_index = 0;
// Define the range [0, n] // setup random rng function
int n = _node_list.size() - 1; // Change 'n' to your desired upper bound std::random_device rd;
std::mt19937 rng{rd()};
int start = 0;
// if we mutate first node, we will select a random starting node
if (mutate_point == 0) {
int first_value = 0;
int last_value = post_order.size() - 1;
std::uniform_int_distribution<> dist{first_value, last_value};
start = post_order[dist(rng)];
// if we don't mutate first, we just use the root node of the post_order
} else {
start = post_order[post_order.size() - 1];
}
// set loop variables // set loop variables
int start = rev_post_order[0];
int i = start; int i = start;
// reserve for _post_order_list to decrease reallocation
_post_order_list.reserve(_node_list.size());
int end_condition = _node_list.size(); int end_condition = _node_list.size();
// this loop assumes start is not from 0 // this loop assumes start is not from 0
@ -112,13 +156,13 @@ maximal_planar_subgraph_finder::mutatedPostOrderTraversal(vector<int> post_order
{ {
if (!_node_list[i]->is_marked()) if (!_node_list[i]->is_marked())
{ {
_node_list[i]->mutated_DFS_visit(_post_order_list, _node_list, postOrderID, traversal_index, rev_post_order, mutate_point); _node_list[i]->mutated_DFS_visit(_post_order_list, _node_list, postOrderID, traversal_index, node_id_to_pos, mutate_point, rng);
} }
break; break;
} }
if (!_node_list[i]->is_marked()) if (!_node_list[i]->is_marked())
{ {
_node_list[i]->mutated_DFS_visit(_post_order_list, _node_list, postOrderID, traversal_index, rev_post_order, mutate_point); _node_list[i]->mutated_DFS_visit(_post_order_list, _node_list, postOrderID, traversal_index, node_id_to_pos, mutate_point, rng);
} }
i = (i + 1) % end_condition; i = (i + 1) % end_condition;
} }
@ -127,7 +171,7 @@ maximal_planar_subgraph_finder::mutatedPostOrderTraversal(vector<int> post_order
void void
maximal_planar_subgraph_finder::print_post_order() { maximal_planar_subgraph_finder::print_post_order() {
int current_index; int current_index;
for (int i = 0; i < _post_order_list.size(); ++i) { for (size_t i = 0; i < _post_order_list.size(); ++i) {
current_index = _post_order_list[i]->node_id(); current_index = _post_order_list[i]->node_id();
std::cout << current_index << ","; std::cout << current_index << ",";
} }
@ -149,12 +193,12 @@ void
maximal_planar_subgraph_finder::sort_adj_list() { maximal_planar_subgraph_finder::sort_adj_list() {
vector<vector<node*> > vecList; vector<vector<node*> > vecList;
vecList.resize(_post_order_list.size()); vecList.resize(_post_order_list.size());
for (int i = 0; i < _post_order_list.size(); ++i) { for (size_t i = 0; i < _post_order_list.size(); ++i) {
for (int j = 0; j < _post_order_list[i]->degree(); ++j) { for (int j = 0; j < _post_order_list[i]->degree(); ++j) {
vecList[_post_order_list[i]->adj(j)->post_order_index()].push_back(_post_order_list[i]); vecList[_post_order_list[i]->adj(j)->post_order_index()].push_back(_post_order_list[i]);
} }
} }
for (int i = 0; i < _post_order_list.size(); ++i) { for (size_t i = 0; i < _post_order_list.size(); ++i) {
_post_order_list[i]->set_adj_list(vecList[i]); _post_order_list[i]->set_adj_list(vecList[i]);
} }
} }
@ -163,20 +207,20 @@ maximal_planar_subgraph_finder::sort_adj_list() {
//Order the edges properly. //Order the edges properly.
void void
maximal_planar_subgraph_finder::determine_edges() { maximal_planar_subgraph_finder::determine_edges() {
for (int i = 0; i < _post_order_list.size(); ++i) { for (size_t i = 0; i < _post_order_list.size(); ++i) {
if (_post_order_list[i]->parent() == 0) continue; if (_post_order_list[i]->parent() == 0) continue;
_post_order_list[i]->set_1st_label(_post_order_list[i]->parent()->post_order_index()); _post_order_list[i]->set_1st_label(_post_order_list[i]->parent()->post_order_index());
_edge_list.push_back(pair<node*, node*> (_post_order_list[i]->parent(), _post_order_list[i])); _edge_list.push_back(pair<node*, node*> (_post_order_list[i]->parent(), _post_order_list[i]));
} }
for (int i = 0; i < _post_order_list.size(); ++i) { for (size_t i = 0; i < _post_order_list.size(); ++i) {
for (int j = 0; j < _post_order_list[i]->degree(); ++j) { for (int j = 0; j < _post_order_list[i]->degree(); ++j) {
if (_post_order_list[i]->adj(j)->post_order_index() > i) break; if (_post_order_list[i]->adj(j)->post_order_index() > static_cast<int>(i)) break;
if (_post_order_list[i]->adj(j)->get_1st_label() == i) continue; if (_post_order_list[i]->adj(j)->get_1st_label() == static_cast<int>(i)) continue;
_back_edge_list.push_back(pair<node*, node*> (_post_order_list[i], _post_order_list[i]->adj(j))); _back_edge_list.push_back(pair<node*, node*> (_post_order_list[i], _post_order_list[i]->adj(j)));
_is_back_edge_eliminate.push_back(false); _is_back_edge_eliminate.push_back(false);
} }
} }
for (int i = 0; i < _post_order_list.size(); ++i) { for (size_t i = 0; i < _post_order_list.size(); ++i) {
_post_order_list[i]->set_1st_label(INT_MAX); _post_order_list[i]->set_1st_label(INT_MAX);
} }
} }
@ -186,7 +230,7 @@ void
maximal_planar_subgraph_finder::back_edge_traversal() { maximal_planar_subgraph_finder::back_edge_traversal() {
node* i_node = 0; node* i_node = 0;
node* current_node = 0; node* current_node = 0;
for (int i = 0; i < _back_edge_list.size(); ++i) { for (size_t i = 0; i < _back_edge_list.size(); ++i) {
current_node = _back_edge_list[i].second; current_node = _back_edge_list[i].second;
i_node = _back_edge_list[i].first; i_node = _back_edge_list[i].first;
if (!back_edge_traversal(current_node, i_node->post_order_index())) _is_back_edge_eliminate[i] = true; if (!back_edge_traversal(current_node, i_node->post_order_index())) _is_back_edge_eliminate[i] = true;
@ -463,7 +507,7 @@ maximal_planar_subgraph_finder::trim(node* u) {
new_AE_root = get_new_node(AE_VIRTUAL_ROOT); new_AE_root = get_new_node(AE_VIRTUAL_ROOT);
new_AE_root->init_AE(node_list[0]); new_AE_root->init_AE(node_list[0]);
//Eliminate the children other than the path. //Eliminate the children other than the path.
for (int i = 1; i < node_list.size(); ++i) { for (size_t i = 1; i < node_list.size(); ++i) {
for (int j = 0; j < node_list[i]->child_num(); ++j) { for (int j = 0; j < node_list[i]->child_num(); ++j) {
if (node_list[i]->child(j) != node_list[i-1]) eliminate(node_list[i]->child(j)); if (node_list[i]->child(j) != node_list[i-1]) eliminate(node_list[i]->child(j));
} }
@ -473,7 +517,7 @@ maximal_planar_subgraph_finder::trim(node* u) {
else { else {
node_list[0]->set_to_boundary_path(down, node_list[1]); node_list[0]->set_to_boundary_path(down, node_list[1]);
node_list[node_list.size()-1]->set_to_boundary_path(up, node_list[node_list.size()-2]); node_list[node_list.size()-1]->set_to_boundary_path(up, node_list[node_list.size()-2]);
for (int i = 1; i < node_list.size()-1; ++i) { for (size_t i = 1; i < node_list.size()-1; ++i) {
node_list[i]->set_to_boundary_path(node_list[i-1], node_list[i+1]); node_list[i]->set_to_boundary_path(node_list[i-1], node_list[i+1]);
} }
} }
@ -481,7 +525,7 @@ maximal_planar_subgraph_finder::trim(node* u) {
up_next = up->get_next(node_list[node_list.size()-1]); up_next = up->get_next(node_list[node_list.size()-1]);
down_next = down->get_next(node_list[0]); down_next = down->get_next(node_list[0]);
//Unfold the c-nodes in the node_list. //Unfold the c-nodes in the node_list.
for (int i = 0; i < node_list.size(); ++i) { for (size_t i = 0; i < node_list.size(); ++i) {
if (node_list[i]->type() == C_NODE) c_node_extension(node_list[i]); if (node_list[i]->type() == C_NODE) c_node_extension(node_list[i]);
} }
//Return the new boundary. //Return the new boundary.
@ -655,7 +699,7 @@ maximal_planar_subgraph_finder::parallel_search_sentinel(node* n0, node* n0_prev
} }
//If the c-node found is top-tier, then assign all the traversed node a pointer to c-node. //If the c-node found is top-tier, then assign all the traversed node a pointer to c-node.
for (int i = 0; i < traversed.size(); ++i) traversed[i]->set_c_node(c); for (size_t i = 0; i < traversed.size(); ++i) traversed[i]->set_c_node(c);
return pair<node*, node*>((node*)0, (node*)0); return pair<node*, node*>((node*)0, (node*)0);
} }
@ -703,7 +747,7 @@ pair<node*, node*> maximal_planar_subgraph_finder::count_sentinel_elimination(pa
node* node*
maximal_planar_subgraph_finder::construct(node* u) { maximal_planar_subgraph_finder::construct(node* u) {
//Basic works. //Basic works.
int i_label = u->get_1st_label(); // int i_label = u->get_1st_label(); // unused
node* node_i = _post_order_list[u->get_1st_label()]; node* node_i = _post_order_list[u->get_1st_label()];
parenting_labeling_shaving(u, node_i); parenting_labeling_shaving(u, node_i);
@ -751,7 +795,7 @@ maximal_planar_subgraph_finder::construct(node* u) {
node* node*
maximal_planar_subgraph_finder::construct(node* c, node* p) { maximal_planar_subgraph_finder::construct(node* c, node* p) {
//Basic works. //Basic works.
int i_label = c->get_1st_label(); // int i_label = c->get_1st_label(); // unused var
node* node_i = _post_order_list[c->get_1st_label()]; node* node_i = _post_order_list[c->get_1st_label()];
parenting_labeling_shaving(p, node_i); parenting_labeling_shaving(p, node_i);
//note: Now, c must have exactly two children left, and c has a parent-link to p, p has achild link to c, too. //note: Now, c must have exactly two children left, and c has a parent-link to p, p has achild link to c, too.
@ -822,11 +866,11 @@ maximal_planar_subgraph_finder::parenting_labeling_shaving(node* u, node* node_i
u_i_path.push_back(u_i_path[u_i_path.size()-1]->parent()); u_i_path.push_back(u_i_path[u_i_path.size()-1]->parent());
if (u_i_path[u_i_path.size()-1] == node_i) break; if (u_i_path[u_i_path.size()-1] == node_i) break;
} }
for (int i = 0; i < u_i_path.size()-2; ++i) { for (size_t i = 0; i < u_i_path.size()-2; ++i) {
u_i_path[i]->add_child(u_i_path[i+1]); u_i_path[i]->add_child(u_i_path[i+1]);
u_i_path[i+1]->set_parent(u_i_path[i]); u_i_path[i+1]->set_parent(u_i_path[i]);
} }
for (int i = 0; i < u_i_path.size()-2; ++i) { for (size_t i = 0; i < u_i_path.size()-2; ++i) {
for (int j = 0; j < u_i_path[i+1]->child_num(); ++j) { for (int j = 0; j < u_i_path[i+1]->child_num(); ++j) {
if (u_i_path[i+1]->child(j) == u_i_path[i]) { if (u_i_path[i+1]->child(j) == u_i_path[i]) {
u_i_path[i+1]->remove_child(j); u_i_path[i+1]->remove_child(j);

115
deferred_planarity_test/src/mps_test.cpp
View File

@ -2,10 +2,14 @@
// Implementation of a MPS algorithm via PC-tree. // Implementation of a MPS algorithm via PC-tree.
//----------------------------------------------------------------------------------- //-----------------------------------------------------------------------------------
#include <chrono>
#include "mps.h" #include "mps.h"
#include <ogdf/fileformats/GraphIO.h> #include <ogdf/fileformats/GraphIO.h>
// #define DEBUG // #define DEBUG
// #define DEBUG_2
// #define TIME
//----------------------------------------------------------------------------------- //-----------------------------------------------------------------------------------
// Finding MPS // Finding MPS
@ -13,36 +17,54 @@
// programs to call from main: // programs to call from main:
int find_mps(string input_file) { // read input file of gml format
maximal_planar_subgraph_finder m; ogdf::Graph read_from_gml(string input_file) {
return m.find_mps(input_file); ogdf::Graph G;
// utilize OGDF readGML
if (!ogdf::GraphIO::read(G, input_file, ogdf::GraphIO::readGML)) {
std::cerr << "Could not read " << input_file << ".gml" << std::endl;
}
return G;
} }
int compute_removed_edge_size(string input_file, vector<int> post_order) {
int find_mps(const ogdf::Graph &G) {
maximal_planar_subgraph_finder m; maximal_planar_subgraph_finder m;
return m.compute_removed_edge_size(input_file, post_order); return m.find_mps(G);
} }
vector<int> generate_post_order(string input_file) { int compute_removed_edge_size(const ogdf::Graph &G, vector<int> post_order) {
maximal_planar_subgraph_finder m; maximal_planar_subgraph_finder m;
return m.generate_post_order(input_file); return m.compute_removed_edge_size(G, post_order);
} }
vector<int> generate_mutated_post_order(string input_file, vector<int> post_order, int mutate_point) { vector<int> generate_post_order(const ogdf::Graph &G) {
maximal_planar_subgraph_finder m; maximal_planar_subgraph_finder m;
return m.generate_mutated_post_order(input_file, post_order, mutate_point); return m.generate_post_order(G);
} }
vector<int> generate_guided_post_order(string input_file, vector<int> post_order) { vector<int> generate_mutated_post_order(const ogdf::Graph &G, vector<int> post_order, int mutate_point) {
maximal_planar_subgraph_finder m; maximal_planar_subgraph_finder m;
return m.generate_guided_post_order(input_file, post_order); return m.generate_mutated_post_order(G, post_order, mutate_point);
}
vector<int> generate_guided_post_order(const ogdf::Graph &G, vector<int> post_order) {
maximal_planar_subgraph_finder m;
return m.generate_guided_post_order(G, post_order);
}
void compute_mps(const ogdf::Graph &G, int mutate_point, vector<int> &post_order, int &return_edge_size) {
maximal_planar_subgraph_finder m;
m.compute_mps(G, mutate_point, post_order, return_edge_size);
} }
// --------- // ---------
int maximal_planar_subgraph_finder::find_mps(string input_file) { int maximal_planar_subgraph_finder::find_mps(const ogdf::Graph &G) {
read_from_gml(input_file); init_from_graph(G);
postOrderTraversal(); postOrderTraversal();
#ifdef DEBUG #ifdef DEBUG
@ -55,8 +77,8 @@ int maximal_planar_subgraph_finder::find_mps(string input_file) {
return output_removed_edge_size(); return output_removed_edge_size();
} }
vector<int> maximal_planar_subgraph_finder::generate_post_order(string input_file) { vector<int> maximal_planar_subgraph_finder::generate_post_order(const ogdf::Graph &G) {
read_from_gml(input_file); init_from_graph(G);
postOrderTraversal(); postOrderTraversal();
#ifdef DEBUG #ifdef DEBUG
@ -68,8 +90,9 @@ vector<int> maximal_planar_subgraph_finder::generate_post_order(string input_fil
} }
// result of this will be used as input to "compute_removed_edge_size" // result of this will be used as input to "compute_removed_edge_size"
vector<int> maximal_planar_subgraph_finder::generate_mutated_post_order(string input_file, vector<int> post_order, int mutate_point) { vector<int> maximal_planar_subgraph_finder::generate_mutated_post_order(const ogdf::Graph &G, const vector<int> &post_order, int mutate_point) {
read_from_gml(input_file); init_from_graph(G);
mutatedPostOrderTraversal(post_order, mutate_point); mutatedPostOrderTraversal(post_order, mutate_point);
#ifdef DEBUG #ifdef DEBUG
@ -81,8 +104,8 @@ vector<int> maximal_planar_subgraph_finder::generate_mutated_post_order(string i
} }
// result of this will be used as input to "compute_removed_edge_size" // result of this will be used as input to "compute_removed_edge_size"
vector<int> maximal_planar_subgraph_finder::generate_guided_post_order(string input_file, vector<int> post_order) { vector<int> maximal_planar_subgraph_finder::generate_guided_post_order(const ogdf::Graph &G, const vector<int> &post_order) {
read_from_gml(input_file); init_from_graph(G);
guidedPostOrderTraversal(post_order); guidedPostOrderTraversal(post_order);
// #ifdef DEBUG // #ifdef DEBUG
@ -95,36 +118,48 @@ vector<int> maximal_planar_subgraph_finder::generate_guided_post_order(string in
int maximal_planar_subgraph_finder::compute_removed_edge_size(string input_file, vector<int> post_order) { int maximal_planar_subgraph_finder::compute_removed_edge_size(const ogdf::Graph &G, vector<int> post_order) {
read_from_gml(input_file); // read_from_gml
init_from_graph(G);
// guidedPostOrderTraversal
guidedPostOrderTraversal(post_order); guidedPostOrderTraversal(post_order);
#ifdef DEBUG
std::cout << "guided post order traversal" << std::endl;
print_post_order();
#endif
sort_adj_list(); sort_adj_list();
determine_edges(); determine_edges();
back_edge_traversal(); back_edge_traversal();
return output_removed_edge_size(); return output_removed_edge_size();
} }
//----------------------------------------------------------------------------------- void maximal_planar_subgraph_finder::reset_state() {
// Imput, output _post_order_list.clear();
//-----------------------------------------------------------------------------------
// read input file of gml format
void maximal_planar_subgraph_finder::read_from_gml(string input_file) {
ogdf::Graph G;
// utilize OGDF readGML
if (!ogdf::GraphIO::read(G, input_file, ogdf::GraphIO::readGML)) {
std::cerr << "Could not read " << input_file << ".gml" << std::endl;
} }
void maximal_planar_subgraph_finder::compute_mps(const ogdf::Graph &G, int mutate_point, vector<int> &post_order, int &return_edge_size) {
init_from_graph(G);
mutatedPostOrderTraversal(post_order, mutate_point);
sort_adj_list();
determine_edges();
back_edge_traversal();
return_edge_size = output_removed_edge_size();
// now we get the canonical representation of the post order
vector<int> temp_post_order = return_post_order();
reset_state(); // clear the _post_order_list
// perform guided Post Order Traversal to flip the tree
guidedPostOrderTraversal(temp_post_order);
post_order = return_post_order();
}
//-----------------------------------------------------------------------------------
// Input, output
//-----------------------------------------------------------------------------------
void maximal_planar_subgraph_finder::init_from_graph(const ogdf::Graph &G) {
// create nodes // create nodes
_node_list.reserve(G.numberOfNodes());
for (int i = 0; i < G.numberOfNodes(); ++i) { for (int i = 0; i < G.numberOfNodes(); ++i) {
_node_list.push_back(new node(P_NODE)); _node_list.push_back(new node(P_NODE));
_node_list[i]->set_id(i); _node_list[i]->set_id(i);
@ -144,7 +179,7 @@ void maximal_planar_subgraph_finder::read_from_gml(string input_file) {
// count the number of removed edges // count the number of removed edges
int maximal_planar_subgraph_finder::output_removed_edge_size() { int maximal_planar_subgraph_finder::output_removed_edge_size() {
int sum = 0; int sum = 0;
for (int i = 0; i < _back_edge_list.size(); ++i) { for (size_t i = 0; i < _back_edge_list.size(); ++i) {
if (_is_back_edge_eliminate[i]) ++sum; if (_is_back_edge_eliminate[i]) ++sum;
} }
return sum; return sum;

139
deferred_planarity_test/src/node.cpp
View File

@ -5,7 +5,7 @@
#include "mps.h" #include "mps.h"
// #define DEBUG // #define DEBUG
#define DEBUG_MUTATION // #define DEBUG_MUTATION
//----------------------------------------------------------------------------------- //-----------------------------------------------------------------------------------
// CONSTRUCTOR // CONSTRUCTOR
@ -37,7 +37,7 @@ void node::set_post_order_index(int i) {_post_order_index = i;}
//Only used when consturcting c-node //Only used when consturcting c-node
//The first node calling this function would not be labeled. //The first node calling this function would not be labeled.
void node::recursively_labeling() { void node::recursively_labeling() {
for (int i = 0; i < _children.size(); ++i) { for (size_t i = 0; i < _children.size(); ++i) {
_children[i]->_label.second = ARTIFICIAL_EDGE; _children[i]->_label.second = ARTIFICIAL_EDGE;
_children[i]->recursively_labeling(); _children[i]->recursively_labeling();
} }
@ -58,7 +58,7 @@ void node::set_adj_list(vector<node*> vec) {_adj_list = vec;}
void node::DFS_visit(vector<node*> &dfsList, int &index) { void node::DFS_visit(vector<node*> &dfsList, int &index) {
mark(); mark();
for (int i = 0; i < _adj_list.size(); ++i) { for (size_t i = 0; i < _adj_list.size(); ++i) {
if (!_adj_list[i]->is_marked()) { if (!_adj_list[i]->is_marked()) {
_adj_list[i]->_parent = this; _adj_list[i]->_parent = this;
_adj_list[i]->DFS_visit(dfsList, index); _adj_list[i]->DFS_visit(dfsList, index);
@ -70,11 +70,19 @@ void node::DFS_visit(vector<node*> &dfsList, int &index) {
} }
bool node::sortByOrder(const std::unordered_map<int, int>& node_id_to_pos, node* a, node* b) {
auto iter_a = node_id_to_pos.find(a->node_id());
auto iter_b = node_id_to_pos.find(b->node_id());
// second yields the position
return iter_a->second < iter_b->second;
}
void node::guided_DFS_visit(vector<node *> &dfsList, void node::guided_DFS_visit(vector<node *> &dfsList,
vector<node *> &node_list, const vector<node *> &node_list,
int &return_index, int &return_index,
vector<int> rev_post_order, const unordered_map<int, int> &node_id_to_pos)
int prev_node)
{ {
mark(); mark();
@ -82,28 +90,35 @@ void node::guided_DFS_visit(vector<node *> &dfsList,
// purpose of this block: create list of neighbors ordered in the order they appear in rev_post_order // purpose of this block: create list of neighbors ordered in the order they appear in rev_post_order
// we want to select neighbors that match the rev_post_order at the specific traversal_index // we want to select neighbors that match the rev_post_order at the specific traversal_index
// create an unordered set to efficiently check for presence of an element // implementation 1: loop through all elements
std::unordered_set<int> neighbor_set; // // create an unordered set to efficiently check for presence of an element
for (int i = 0; i < _adj_list.size(); ++i) { // std::unordered_set<int> neighbor_set;
neighbor_set.insert(_adj_list[i]->node_id()); // for (int i = 0; i < _adj_list.size(); ++i) {
} // neighbor_set.insert(_adj_list[i]->node_id());
// when an element in rev_post_order is found in neighbor_set, we add that to neighbor_list // }
// this produces a neighbor_list that follows the order by which they occur in the rev_post_order // // when an element in rev_post_order is found in neighbor_set, we add that to neighbor_list
// it is ok if the neighbor was already visited before, // // this produces a neighbor_list that follows the order by which they occur in the rev_post_order
// it would've been marked and will be subsequently ignored // // it is ok if the neighbor was already visited before,
vector<node *> neighbor_list; // // it would've been marked and will be subsequently ignored
for (int i = 0; i < rev_post_order.size(); ++i) { // vector<node *> neighbor_list;
if (neighbor_set.find(rev_post_order[i]) != neighbor_set.end()) { // for (int i = 0; i < rev_post_order.size(); ++i) {
// only add if newly encountered // if (neighbor_set.find(rev_post_order[i]) != neighbor_set.end()) {
if (!node_list[rev_post_order[i]]->is_marked()) { // // only add if newly encountered
neighbor_list.push_back(node_list[rev_post_order[i]]); // if (!node_list[rev_post_order[i]]->is_marked()) {
} // neighbor_list.push_back(node_list[rev_post_order[i]]);
} // }
} // }
// }
// implementation 2: sort elements of _adj_list
vector<node*> neighbor_list = _adj_list;
std::sort(neighbor_list.begin(), neighbor_list.end(), [this, &node_id_to_pos](node* a, node* b) {
return sortByOrder(node_id_to_pos, a, b);
});
#ifdef DEBUG #ifdef DEBUG
std::cout << "current node:" << this->node_id() << std::endl; std::cout << "current node:" << this->node_id() << std::endl;
std::cout << "prev node:" << prev_node << 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() << "(" << neighbor_list[i]->is_marked() << ")" << ","; std::cout << neighbor_list[i]->node_id() << "(" << neighbor_list[i]->is_marked() << ")" << ",";
} }
@ -112,10 +127,10 @@ void node::guided_DFS_visit(vector<node *> &dfsList,
for (int i = 0; i < neighbor_list.size(); ++i) { for (size_t i = 0; i < neighbor_list.size(); ++i) {
if (!neighbor_list[i]->is_marked()) { if (!neighbor_list[i]->is_marked()) {
neighbor_list[i]->_parent = this; neighbor_list[i]->_parent = this;
neighbor_list[i]->guided_DFS_visit(dfsList, node_list, return_index, rev_post_order, this->node_id()); neighbor_list[i]->guided_DFS_visit(dfsList, node_list, return_index, node_id_to_pos);
} }
} }
@ -124,13 +139,13 @@ void node::guided_DFS_visit(vector<node *> &dfsList,
++return_index; ++return_index;
} }
void node::mutated_DFS_visit(vector<node *> &dfsList, void node::mutated_DFS_visit(vector<node *> &dfsList,
vector<node*> &node_list, const vector<node *> &node_list,
int &return_index, int &return_index,
int &traversal_index, int &traversal_index,
vector<int> rev_post_order, const unordered_map<int, int> &node_id_to_pos,
int mutate_point) int mutate_point,
mt19937 rng)
{ {
// mark current node // mark current node
@ -139,53 +154,57 @@ void node::mutated_DFS_visit(vector<node*> &dfsList,
// purpose of this block: create list of neighbors ordered in the order they appear in rev_post_order // purpose of this block: create list of neighbors ordered in the order they appear in rev_post_order
// we want to select neighbors that match the rev_post_order at the specific traversal_index // we want to select neighbors that match the rev_post_order at the specific traversal_index
// create an unordered set to efficiently check for presence of an element // // implementation 1: naively check by running through all elements of rev_post_order
std::unordered_set<int> neighbor_set; // // create an unordered set to efficiently check for presence of an element
for (int i = 0; i < _adj_list.size(); ++i) { // std::unordered_set<int> neighbor_set;
neighbor_set.insert(_adj_list[i]->node_id()); // for (size_t i = 0; i < _adj_list.size(); ++i) {
} // neighbor_set.insert(_adj_list[i]->node_id());
// when an element in rev_post_order is found in neighbor_set, we add that to neighbor_list // }
// this produces a neighbor_list that follows the order by which they occur in the rev_post_order // // when an element in rev_post_order is found in neighbor_set, we add that to neighbor_list
// it is ok if the neighbor was already visited before, // // this produces a neighbor_list that follows the order by which they occur in the rev_post_order
// it would've been marked and will be subsequently ignored // // it is ok if the neighbor was already visited before,
vector<node *> neighbor_list; // // it would've been marked and will be subsequently ignored
for (int i = 0; i < rev_post_order.size(); ++i) { // vector<node *> neighbor_list;
if (neighbor_set.find(rev_post_order[i]) != neighbor_set.end()) { // for (size_t i = 0; i < rev_post_order.size(); ++i) {
neighbor_list.push_back(node_list[rev_post_order[i]]); // if (neighbor_set.find(rev_post_order[i]) != neighbor_set.end()) {
} // neighbor_list.push_back(node_list[rev_post_order[i]]);
} // }
// }
vector<node*> neighbor_list = _adj_list;
// since we increment the index before this line, the current index is "index - 1"
// if the current index matches the mutate_point, then we know this is the cycle to mutate // if the current index matches the mutate_point, then we know this is the cycle to mutate
if (traversal_index == mutate_point) { if (traversal_index == mutate_point) {
// Create a random number generator and seed it // we shuffle the neighbor list
// 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); std::shuffle(neighbor_list.begin(), neighbor_list.end(), rng);
// otherwise just sort based on the order set by node_id_to_pos, which is
// set by the reversed post_order
} else {
std::sort(neighbor_list.begin(), neighbor_list.end(), [this, &node_id_to_pos](node *a, node *b)
{ return sortByOrder(node_id_to_pos, a, b); });
}
#ifdef DEBUG_MUTATION #ifdef DEBUG_MUTATION
std::cout << "current node:" << this->node_id() << std::endl; std::cout << "current node:" << this->node_id() << std::endl;
for (int i = 0; i < neighbor_list.size(); ++i) { for (size_t i = 0; i < neighbor_list.size(); ++i) {
std::cout << neighbor_list[i]->node_id() << "(" << neighbor_list[i]->is_marked() << ")" << ","; std::cout << neighbor_list[i]->node_id() << "(" << neighbor_list[i]->is_marked() << ")" << ",";
} }
std::cout << std::endl; std::cout << std::endl;
#endif #endif
}
// increment traversal index after checking // increment traversal index after checking
// next node will receive incremented index // next node will receive incremented index
traversal_index++; traversal_index++;
for (int i = 0; i < neighbor_list.size(); ++i) for (size_t i = 0; i < neighbor_list.size(); ++i)
{ {
if (!neighbor_list[i]->is_marked()) if (!neighbor_list[i]->is_marked())
{ {
neighbor_list[i]->_parent = this; neighbor_list[i]->_parent = this;
neighbor_list[i]->mutated_DFS_visit(dfsList, node_list, return_index, traversal_index, rev_post_order, mutate_point); neighbor_list[i]->mutated_DFS_visit(dfsList, node_list, return_index, traversal_index, node_id_to_pos, mutate_point, rng);
} }
} }
@ -213,7 +232,7 @@ void node::remove_child(int i) {
} }
void node::remove_child(node* n) { void node::remove_child(node* n) {
for (int i = 0; i < _children.size(); ++i) { for (size_t i = 0; i < _children.size(); ++i) {
if (_children[i] == n) { if (_children[i] == n) {
_children[i] = _children[_children.size()-1]; _children[i] = _children[_children.size()-1];
_children.resize(_children.size()-1); _children.resize(_children.size()-1);
@ -289,7 +308,7 @@ void node::init_AE(node* u) {
if (u->child_num() == 0) return; if (u->child_num() == 0) return;
_children = u->_children; _children = u->_children;
u->clear_children(); u->clear_children();
for (int i = 0; i < _children.size(); ++i) { for (size_t i = 0; i < _children.size(); ++i) {
_children[i]->set_parent(this); _children[i]->set_parent(this);
} }
set_parent(u); set_parent(u);