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#include <iostream>
#include <random>
#include <chrono>
#include <gudhi/Simplex_tree.h>
#include <gudhi/Toplex_map.h>
#include <gudhi/Lazy_Toplex_map.h>
using namespace Gudhi;
typedef Toplex_map::Simplex Simplex;
typedef Toplex_map::Vertex Vertex;
typedef std::pair< Simplex_tree<>::Simplex_handle, bool > typePairSimplexBool;
class ST_wrapper {
public:
void insert_simplex(const Simplex& tau) {
simplexTree.insert_simplex_and_subfaces(tau);
}
bool membership(const Simplex& tau) {
return simplexTree.find(tau) != simplexTree.null_simplex();
}
Vertex contraction(const Vertex x, const Vertex y) {
Simplex sx; sx.insert(x);
auto hx = simplexTree.find(sx);
if(hx != simplexTree.null_simplex())
for(auto h : simplexTree.cofaces_simplex_range(hx,0)){
auto sr = simplexTree.simplex_vertex_range(h);
Simplex sigma(sr.begin(),sr.end());
erase_max(sigma);
sigma.erase(x);
sigma.insert(y);
insert_simplex(sigma);
}
return y;
}
std::size_t num_maximal_simplices() {
return simplexTree.num_simplices();
}
private:
Simplex_tree<> simplexTree;
void erase_max(const Simplex& sigma) {
if(membership(sigma))
simplexTree.remove_maximal_simplex(simplexTree.find(sigma));
}
};
int n = 300;
int nb_insert_simplex1 = 3000;
int nb_membership1 = 4000;
int nb_contraction = 300;
int nb_insert_simplex2 = 3000;
int nb_membership2 = 400000;
Simplex random_simplex(int n, std::size_t d){
std::random_device rd;
std::mt19937 gen(rd());
std::uniform_int_distribution<std::size_t> dis(1, n);
Simplex s;
while(s.size()!=d)
s.insert(dis(gen));
return s;
}
std::vector<Simplex> r_vector_simplices(int n, int max_d, int m){
std::random_device rd;
std::mt19937 gen(rd());
std::uniform_int_distribution<std::size_t> dis(1, max_d);
std::vector<Simplex> v;
for(int i=0; i<m; i++)
v.push_back(random_simplex(n,dis(gen)));
return v;
}
template<typename complex_type>
void chrono(int n, int d){
complex_type K;
std::vector<Simplex> simplices_insert_simplex1 = r_vector_simplices(n,d,nb_insert_simplex1);
std::vector<Simplex> simplices_membership1 = r_vector_simplices(n,d,nb_membership1);
std::vector<Simplex> simplices_insert_simplex2 = r_vector_simplices(n - 2*nb_contraction,d,nb_insert_simplex2);
std::vector<Simplex> simplices_membership2 = r_vector_simplices(n - 2*nb_contraction,d,nb_membership2);
std::chrono::time_point<std::chrono::system_clock> start, end;
for(const Simplex& s : simplices_insert_simplex1)
K.insert_simplex(s);
for(const Simplex& s : simplices_membership1)
K.membership(s);
start = std::chrono::system_clock::now();
for(int i = 0; i<=nb_contraction; i++)
K.contraction(n-2*i,n-2*i-1);
end = std::chrono::system_clock::now();
auto c3 = std::chrono::duration_cast<std::chrono::milliseconds>(end-start).count();
start = std::chrono::system_clock::now();
for(const Simplex& s : simplices_insert_simplex2)
K.insert_simplex(s);
end = std::chrono::system_clock::now();
auto c1 = std::chrono::duration_cast<std::chrono::milliseconds>(end-start).count();
start = std::chrono::system_clock::now();
for(const Simplex& s : simplices_membership2)
K.membership(s);
end = std::chrono::system_clock::now();
auto c2 = std::chrono::duration_cast<std::chrono::milliseconds>(end-start).count();
std::cout << c1 << "\t \t" << c2 << "\t \t" << c3 << "\t \t" << K.num_maximal_simplices() << std::endl;
}
int main(){
for(int d=5;d<=40;d+=5){
std::cout << "d=" << d << " \t Insertions \t Membership \t Contractions \t Size" << std::endl;
std::cout << "T Map \t \t";
chrono<Toplex_map>(n,d);
std::cout << "Lazy \t \t";
chrono<Lazy_Toplex_map>(n,d);
if(d<=15){
std::cout << "ST \t \t";
chrono<ST_wrapper>(n,d);
}
std::cout << std::endl;
}
}
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