public void ZeroWeightsTest()
{
// creates network nodes
const int num = 10;
var network = new Network();
for (var i = 0u; i < num; i++)
{
network.AddVertex(i);
}
// creates edges (full with 0 weight)
for (var i = 0u; i < num; i++)
{
for (var j = i + 1; j < num; j++)
{
network.AddEdge(new Connection(i, j, 0));
}
}
Console.WriteLine(network);
// creates and updates community algorithm
var commAlgorithm = new CommunityAlgorithm(network);
commAlgorithm.Update();
commAlgorithm.DisplayNodesCommunities();
commAlgorithm.DisplayCommunities();
for (var i = 0u; i < num; i++)
{
Assert.AreEqual(i, commAlgorithm.NodesCommunities[i], $"Node {i} should be in community {i}.");
}
Assert.AreEqual(num, commAlgorithm.GetNumberCommunities(), $"Num. communities should be {num}.");
Assert.AreEqual(0, commAlgorithm.GetModularity(), double.Epsilon, "Community modularity should be 0.");
}
public void NoConnectionsTest()
{
// creates network nodes
const int num = 10;
var network = new Network();
for (var i = 0u; i < num; i++)
{
network.AddVertex(i);
}
Console.WriteLine(network);
// creates and updates community algorithm
var commAlgorithm = new CommunityAlgorithm(network);
commAlgorithm.Update();
commAlgorithm.DisplayNodesCommunities();
commAlgorithm.DisplayCommunities();
Assert.AreEqual(0, network.EdgeCount, "Network should not contain edges.");
for (var i = 0u; i < num; i++)
{
Assert.AreEqual(i, commAlgorithm.NodesCommunities[i], $"Node {i} should be in community {i}.");
}
Assert.AreEqual(num, commAlgorithm.GetNumberCommunities(), $"Num. communities should be {num}.");
Assert.AreEqual(0, commAlgorithm.GetModularity(), double.Epsilon, "Community modularity should be 0.");
}
private static UndirectedGraph <Node, Edge> GetGraph(
CommunityAlgorithm communityAlg, bool showLabels, PaletteGenerator paletteGenerator)
{
// generates community color palette
paletteGenerator = paletteGenerator ?? TolPalettes.CreateTolDivPalette;
var colors = paletteGenerator(communityAlg.GetNumberCommunities());
// creates a graphviz from the network and communities
var graph = new UndirectedGraph <Node, Edge>();
// adds nodes with community info
var nodes = new Node[communityAlg.Size];
foreach (var nodeID in communityAlg.Network.Vertices)
{
var node = new Node(nodeID, communityAlg.NodesCommunities[nodeID])
{
Color = colors[communityAlg.NodesCommunities[nodeID]], ShowLabel = showLabels
};
nodes[nodeID] = node;
graph.AddVertex(node);
}
// adds edges from connections
foreach (var conn in communityAlg.Network.Edges)
{
graph.AddEdge(new Edge(nodes[conn.Source], nodes[conn.Target], conn.Weight)
{
ShowLabel = showLabels
});
}
return(graph);
}
public void RenumberTest()
{
// creates network nodes
const int num = 10;
var network = new Network();
for (var i = 0u; i < num; i++)
{
network.AddVertex(i);
}
// creates edges (random)
var random = new Random();
for (var i = 0u; i < num; i++)
{
for (var j = i + 1; j < num; j++)
{
if (random.NextDouble() > 0.6)
{
network.AddEdge(new Connection(i, j));
}
}
}
Console.WriteLine(network);
// creates and updates community algorithm
var commAlgorithm = new CommunityAlgorithm(network);
commAlgorithm.Update(false);
// copies communities
Console.WriteLine("Before renumbering:");
commAlgorithm.DisplayCommunities();
var beforeComms = new HashSet <uint> [num];
for (var i = 0; i < num; i++)
{
beforeComms[i] = new HashSet <uint>(commAlgorithm.Communities[i]);
}
var beforeNumComms = commAlgorithm.GetNumberCommunities();
// renumbers communities
Console.WriteLine("After renumbering:");
commAlgorithm.RenumberCommunities();
commAlgorithm.DisplayCommunities();
Assert.AreEqual(beforeNumComms, commAlgorithm.GetNumberCommunities(),
$"Number of communities after renumbering should be the same: {beforeNumComms}");
for (var i = 0u; i < num - 1; i++)
{
if (commAlgorithm.Communities[i].Count == 0)
{
Assert.IsTrue(commAlgorithm.Communities[i + 1].Count == 0,
$"Community {i + 1} should have 0 nodes since community {i} has 0.");
}
if (i < beforeNumComms && beforeComms[i].Count > 0)
{
Assert.IsTrue(beforeComms[i].SetEquals(commAlgorithm.Communities[i]),
$"Renumbering should have maintained community {i}.");
}
}
}
public void NetworkPassesTest()
{
// creates network nodes
const int numNodes = 16;
var network = new Network();
for (var i = 0u; i < numNodes; i++)
{
network.AddVertex(i);
}
// creates edges (according to paper)
network.AddEdge(new Connection(0, 2));
network.AddEdge(new Connection(0, 4));
network.AddEdge(new Connection(0, 3));
network.AddEdge(new Connection(0, 5));
network.AddEdge(new Connection(1, 2));
network.AddEdge(new Connection(1, 4));
network.AddEdge(new Connection(1, 7));
network.AddEdge(new Connection(2, 4));
network.AddEdge(new Connection(2, 5));
network.AddEdge(new Connection(2, 6));
network.AddEdge(new Connection(3, 7));
network.AddEdge(new Connection(4, 10));
network.AddEdge(new Connection(5, 7));
network.AddEdge(new Connection(5, 11));
network.AddEdge(new Connection(6, 7));
network.AddEdge(new Connection(6, 11));
network.AddEdge(new Connection(8, 9));
network.AddEdge(new Connection(8, 10));
network.AddEdge(new Connection(8, 11));
network.AddEdge(new Connection(8, 14));
network.AddEdge(new Connection(8, 15));
network.AddEdge(new Connection(9, 12));
network.AddEdge(new Connection(9, 14));
network.AddEdge(new Connection(10, 11));
network.AddEdge(new Connection(10, 12));
network.AddEdge(new Connection(10, 13));
network.AddEdge(new Connection(10, 14));
network.AddEdge(new Connection(11, 13));
// creates and updates community algorithm
var communityAlg = new CommunityAlgorithm(network, -1, 0);
communityAlg.Update();
communityAlg.DisplayCommunities();
//checks communities
Assert.AreEqual(4, communityAlg.GetNumberCommunities(), "Network should have 4 communities.");
var communities = new[]
{
new HashSet <uint> {
0, 1, 2, 4, 5
},
new HashSet <uint> {
3, 6, 7
},
new HashSet <uint> {
11, 13
},
new HashSet <uint> {
8, 9, 10, 12, 14, 15
}
};
for (var i = 0; i < 4; i++)
{
var community = communityAlg.Communities[i];
Console.WriteLine(ArrayUtil.ToString(community.ToArray()));
Assert.IsTrue(communities.Any(comm => comm.SetEquals(community)), $"Community {i} is unexpected.");
}
// gets and checks community graph (1st pass)
communityAlg.DisplayCommunityGraph();
communityAlg.DisplayPartition();
network = communityAlg.GetCommunityNetwork();
Assert.AreEqual(4, network.VertexCount, "Community network should have 4 nodes.");
// checks connections
var exptConns = new HashSet <Connection>
{
new Connection(0, 0, 16),
new Connection(0, 1, 1),
new Connection(0, 2, 3),
new Connection(1, 1, 14),
new Connection(1, 2, 1),
new Connection(1, 3, 4),
new Connection(2, 2, 2),
new Connection(2, 3, 1),
new Connection(3, 3, 4)
};
var netConns = new HashSet <Connection>(network.Edges);
foreach (var exptConn in exptConns)
{
Console.WriteLine(exptConn);
Assert.IsTrue(netConns.Contains(exptConn), $"Community network should contain connection: {exptConn}.");
}
//// creates and updates community algorithm
//communityAlg = new CommunityAlgorithm(network, -1, 0);
//communityAlg.Update();
//communityAlg.DisplayCommunities();
}