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// Copyright (C) 2005-2008 The Trustees of Indiana University.
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Authors: Douglas Gregor
// Andrew Lumsdaine
//
// Test of Hohberg's distributed biconnected components algorithm.
#include <boost/graph/use_mpi.hpp>
#include <boost/config.hpp>
#include <boost/throw_exception.hpp>
#include <boost/graph/distributed/hohberg_biconnected_components.hpp>
#include <boost/graph/distributed/mpi_process_group.hpp>
#include <boost/graph/distributed/adjacency_list.hpp>
#include <boost/core/lightweight_test.hpp>
#ifdef BOOST_NO_EXCEPTIONS
void
boost::throw_exception(std::exception const& ex)
{
std::cout << ex.what() << std::endl;
abort();
}
#endif
using boost::graph::distributed::mpi_process_group;
using namespace boost;
template<typename Graph>
void check_components(const Graph& g, std::size_t num_comps)
{
std::size_t not_mapped = (std::numeric_limits<std::size_t>::max)();
std::vector<std::size_t> color_to_name(num_comps, not_mapped);
BGL_FORALL_EDGES_T(e, g, Graph) {
BOOST_TEST(get(edge_color, g, e) < num_comps);
if (color_to_name[get(edge_color, g, e)] == not_mapped)
color_to_name[get(edge_color, g, e)] = get(edge_name, g, e);
BOOST_TEST(color_to_name[get(edge_color,g,e)] == get(edge_name,g,e));
if (color_to_name[get(edge_color,g,e)] != get(edge_name,g,e)) {
for (std::size_t i = 0; i < color_to_name.size(); ++i)
std::cerr << color_to_name[i] << ' ';
std::cerr << std::endl;
std::cerr << color_to_name[get(edge_color,g,e)] << " != "
<< get(edge_name,g,e) << " on edge "
<< local(source(e, g)) << " -> " << local(target(e, g))
<< std::endl;
}
}
}
template<typename Graph>
void
test_small_hohberg_biconnected_components(Graph& g, int n, int comps_expected,
bool single_component = true)
{
using boost::graph::distributed::hohberg_biconnected_components;
bool is_root = (process_id(process_group(g)) == 0);
if (single_component) {
for (int i = 0; i < n; ++i) {
if (is_root) std::cerr << "Testing with leader = " << i << std::endl;
// Scramble edge_color_map
BGL_FORALL_EDGES_T(e, g, Graph)
put(edge_color, g, e, 17);
typename graph_traits<Graph>::vertex_descriptor leader = vertex(i, g);
int num_comps =
hohberg_biconnected_components(g, get(edge_color, g), &leader,
&leader + 1);
BOOST_TEST(num_comps == comps_expected);
check_components(g, num_comps);
}
}
if (is_root) std::cerr << "Testing simple interface." << std::endl;
synchronize(g);
// Scramble edge_color_map
int i = 0;
BGL_FORALL_EDGES_T(e, g, Graph) {
++i;
put(edge_color, g, e, 17);
}
std::cerr << process_id(process_group(g)) << " has "
<< i << " edges.\n";
int num_comps = hohberg_biconnected_components(g, get(edge_color, g));
BOOST_TEST(num_comps == comps_expected);
check_components(g, num_comps);
}
int main(int argc, char* argv[])
{
mpi::environment env(argc, argv);
typedef adjacency_list<listS,
distributedS<mpi_process_group, vecS>,
undirectedS,
// Vertex properties
no_property,
// Edge properties
property<edge_name_t, std::size_t,
property<edge_color_t, std::size_t> > > Graph;
typedef std::pair<int, int> E;
{
// Example 1: A single component with 2 bicomponents
E edges_init[] = { E(0, 1), E(0, 2), E(1, 3), E(2, 4), E(3, 4), E(4, 5),
E(4, 6), E(5, 6) };
const int m = sizeof(edges_init) / sizeof(E);
std::size_t expected_components[m] = { 0, 0, 0, 0, 0, 1, 1, 1 };
const int n = 7;
Graph g(&edges_init[0], &edges_init[0] + m, &expected_components[0], n);
int num_comps_expected =
*std::max_element(&expected_components[0], &expected_components[0] + m)
+ 1;
test_small_hohberg_biconnected_components(g, n, num_comps_expected);
}
{
// Example 2: A single component with 4 bicomponents
E edges_init[] = { E(0, 1), E(1, 2), E(2, 0), E(2, 3), E(3, 4), E(4, 5),
E(5, 2), E(3, 6), E(6, 7), E(7, 8), E(8, 6) };
const int m = sizeof(edges_init) / sizeof(E);
std::size_t expected_components[m] = { 0, 0, 0, 1, 1, 1, 1, 2, 3, 3, 3 };
const int n = 9;
Graph g(&edges_init[0], &edges_init[0] + m, &expected_components[0], n);
int num_comps_expected =
*std::max_element(&expected_components[0], &expected_components[0] + m)
+ 1;
test_small_hohberg_biconnected_components(g, n, num_comps_expected);
}
{
// Example 3: Two components, 6 bicomponents
// This is just the concatenation of the two previous graphs.
E edges_init[] = { /* Example 1 graph */
E(0, 1), E(0, 2), E(1, 3), E(2, 4), E(3, 4), E(4, 5),
E(4, 6), E(5, 6),
/* Example 2 graph */
E(7, 8), E(8, 9), E(9, 7), E(9, 10), E(10, 11),
E(11, 12), E(12, 9), E(10, 13), E(13, 14), E(14, 15),
E(15, 13) };
const int m = sizeof(edges_init) / sizeof(E);
std::size_t expected_components[m] =
{ /* Example 1 */0, 0, 0, 0, 0, 1, 1, 1,
/* Example 2 */2, 2, 2, 3, 3, 3, 3, 4, 5, 5, 5 };
const int n = 16;
Graph g(&edges_init[0], &edges_init[0] + m, &expected_components[0], n);
int num_comps_expected =
*std::max_element(&expected_components[0], &expected_components[0] + m)
+ 1;
test_small_hohberg_biconnected_components(g, n, num_comps_expected,
false);
}
return boost::report_errors();
}
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