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/* This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
* See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
* Author(s): Siddharth Pritam, Vincent Rouvreau
*
* Copyright (C) 2020 Inria
*
* Modification(s):
* - YYYY/MM Author: Description of the modification
*/
#include <gudhi/Flag_complex_edge_collapser.h>
#include <gudhi/Simplex_tree.h>
#include <gudhi/Persistent_cohomology.h>
#include <gudhi/reader_utils.h>
#include <gudhi/graph_simplicial_complex.h>
#include <boost/program_options.hpp>
using Simplex_tree = Gudhi::Simplex_tree<Gudhi::Simplex_tree_options_fast_persistence>;
using Filtration_value = Simplex_tree::Filtration_value;
using Vertex_handle = Simplex_tree::Vertex_handle;
using Flag_complex_edge_collapser = Gudhi::collapse::Flag_complex_edge_collapser<Vertex_handle, Filtration_value>;
using Proximity_graph = Gudhi::Proximity_graph<Flag_complex_edge_collapser>;
using Field_Zp = Gudhi::persistent_cohomology::Field_Zp;
using Persistent_cohomology = Gudhi::persistent_cohomology::Persistent_cohomology<Simplex_tree, Field_Zp>;
using Distance_matrix = std::vector<std::vector<Filtration_value>>;
void program_options(int argc, char* const argv[], double& min_persistence, double& end_thresold,
int& dimension, int& dim_max, std::string& csv_matrix_file, std::string& filediag) {
namespace po = boost::program_options;
po::options_description visible("Allowed options", 100);
visible.add_options()
("help,h", "produce help message")
("min_persistence,m", po::value<double>(&min_persistence)->default_value(0.1),
"Minimum persistence interval length")
("end_thresold,e", po::value<double>(&end_thresold)->default_value(1),
"Final threshold for rips complex.")
("dimensions,D", po::value<int>(&dimension)->default_value(2),
"Dimension of the manifold.")
("dim_max,k ", po::value<int>(&dim_max)->default_value(2),
"Maximum allowed dimension of the Rips complex.")
("input_file_name,i", po::value<std::string>(&csv_matrix_file),
"The input file.")
("filediag,o", po::value<std::string>(&filediag),
"The output file.");
po::options_description all;
all.add(visible);
po::variables_map vm;
po::store(po::command_line_parser(argc, argv).options(all).run(), vm);
po::notify(vm);
if (vm.count("help")) {
std::cout << std::endl;
std::cout << "Computes rips complexes of different threshold values, to 'end_thresold' from a n random uniform "
"point_vector on a selected manifold, . \n";
std::cout << "Strongly collapses all the rips complexes and output the results in out_file. \n";
std::cout << "The experiments are repeted 'repete' num of times for each threshold value. \n";
std::cout << "type -m for manifold options, 's' for uni sphere, 'b' for unit ball, 'f' for file. \n";
std::cout << "type -i 'filename' for Input file option for exported point sample. \n";
std::cout << std::endl << std::endl;
std::cout << "Usage: " << argv[0] << " [options]" << std::endl << std::endl;
std::cout << visible << std::endl;
std::abort();
}
}
void program_options(int argc, char* argv[], std::string& csv_matrix_file, std::string& filediag,
Filtration_value& threshold, int& dim_max, int& p, Filtration_value& min_persistence);
int main(int argc, char* argv[]) {
std::string csv_matrix_file;
std::string filediag;
Filtration_value threshold;
int dim_max = 2;
int p;
Filtration_value min_persistence;
program_options(argc, argv, csv_matrix_file, filediag, threshold, dim_max, p, min_persistence);
Distance_matrix distances = Gudhi::read_lower_triangular_matrix_from_csv_file<Filtration_value>(csv_matrix_file);
std::cout << "Read the distance matrix succesfully, of size: " << distances.size() << std::endl;
Proximity_graph proximity_graph = Gudhi::compute_proximity_graph<Simplex_tree>(boost::irange((size_t)0,
distances.size()),
threshold,
[&distances](size_t i, size_t j) {
return distances[j][i];
});
// Now we will perform filtered edge collapse to sparsify the edge list edge_t.
Flag_complex_edge_collapser edge_collapser(proximity_graph);
Simplex_tree stree;
for (Vertex_handle vertex = 0; static_cast<std::size_t>(vertex) < distances.size(); vertex++) {
// insert the vertex with a 0. filtration value just like a Rips
stree.insert_simplex({vertex}, 0.);
}
edge_collapser.process_edges(
[&stree](std::vector<Vertex_handle> edge, Filtration_value filtration) {
// insert the 2 vertices with a 0. filtration value just like a Rips
stree.insert_simplex({edge[0]}, 0.);
stree.insert_simplex({edge[1]}, 0.);
// insert the edge
stree.insert_simplex(edge, filtration);
});
stree.expansion(dim_max);
std::cout << "The complex contains " << stree.num_simplices() << " simplices after collapse. \n";
std::cout << " and has dimension " << stree.dimension() << " \n";
// Sort the simplices in the order of the filtration
stree.initialize_filtration();
// Compute the persistence diagram of the complex
Persistent_cohomology pcoh(stree);
// initializes the coefficient field for homology
pcoh.init_coefficients(3);
pcoh.compute_persistent_cohomology(min_persistence);
if (filediag.empty()) {
pcoh.output_diagram();
} else {
std::ofstream out(filediag);
pcoh.output_diagram(out);
out.close();
}
return 0;
}
void program_options(int argc, char* argv[], std::string& csv_matrix_file, std::string& filediag,
Filtration_value& threshold, int& dim_max, int& p, Filtration_value& min_persistence) {
namespace po = boost::program_options;
po::options_description hidden("Hidden options");
hidden.add_options()(
"input-file", po::value<std::string>(&csv_matrix_file),
"Name of file containing a distance matrix. Can be square or lower triangular matrix. Separator is ';'.");
po::options_description visible("Allowed options", 100);
visible.add_options()("help,h", "produce help message")(
"output-file,o", po::value<std::string>(&filediag)->default_value(std::string()),
"Name of file in which the persistence diagram is written. Default print in std::cout")(
"max-edge-length,r",
po::value<Filtration_value>(&threshold)->default_value(std::numeric_limits<Filtration_value>::infinity()),
"Maximal length of an edge for the Rips complex construction.")(
"cpx-dimension,d", po::value<int>(&dim_max)->default_value(1),
"Maximal dimension of the Rips complex we want to compute.")(
"field-charac,p", po::value<int>(&p)->default_value(11),
"Characteristic p of the coefficient field Z/pZ for computing homology.")(
"min-persistence,m", po::value<Filtration_value>(&min_persistence),
"Minimal lifetime of homology feature to be recorded. Default is 0. Enter a negative value to see zero length "
"intervals");
po::positional_options_description pos;
pos.add("input-file", 1);
po::options_description all;
all.add(visible).add(hidden);
po::variables_map vm;
po::store(po::command_line_parser(argc, argv).options(all).positional(pos).run(), vm);
po::notify(vm);
if (vm.count("help") || !vm.count("input-file")) {
std::cout << std::endl;
std::cout << "Compute the persistent homology with coefficient field Z/pZ \n";
std::cout << "of a Rips complex after edge collapse defined on a set of distance matrix.\n \n";
std::cout << "The output diagram contains one bar per line, written with the convention: \n";
std::cout << " p dim b d \n";
std::cout << "where dim is the dimension of the homological feature,\n";
std::cout << "b and d are respectively the birth and death of the feature and \n";
std::cout << "p is the characteristic of the field Z/pZ used for homology coefficients." << std::endl << std::endl;
std::cout << "Usage: " << argv[0] << " [options] input-file" << std::endl << std::endl;
std::cout << visible << std::endl;
exit(-1);
}
}
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