public Route Search( Graph graph, bool printProgress = false )
{
if ( printProgress )
{
Console.ForegroundColor = ConsoleColor.Cyan;
Console.WriteLine( "Selecting the best result from {0} different searchers...", Searchers.Length );
Console.ForegroundColor = ConsoleColor.White;
}
ISearcher bestSearcher = Searchers[0];
Route best = Searchers[0].Search( graph, printProgress );
for ( int i = 1; i < Searchers.Length; ++i )
{
Route next = Searchers[i].Search( graph, printProgress );
if ( next.Length < best.Length )
{
bestSearcher = Searchers[i];
best = next;
}
}
if ( printProgress )
{
Console.ForegroundColor = ConsoleColor.Cyan;
Console.WriteLine( "And the winner is: {0} ({1})!", bestSearcher.GetType().Name, best.Length );
Console.ForegroundColor = ConsoleColor.White;
}
return best;
}
public GeneticRoute(Graph graph, ushort[] genes)
: base(graph)
{
if (genes.Length != graph.Count)
throw new Exception("Incorrect gene count");
Genes = genes;
UpdateIndicesFromGenes();
}
public GeneticRoute(Graph graph, Random rand)
: base(graph)
{
Genes = new ushort[graph.Count];
for (int i = 0; i < Genes.Length; ++i) {
Genes[i] = (ushort) rand.Next(0, (Genes.Length - i));
}
UpdateIndicesFromGenes();
}
public Ant(Graph graph, int startVertex)
{
Graph = graph;
CurrentVertex = startVertex;
History = new int[graph.Count];
_stepNo = 0;
_cost = 0;
_visited = new bool[graph.Count];
_rand = new Random(_sRand.Next());
}
public Route Search( Graph graph, bool printProgress = false )
{
Route route = new Route( graph );
if ( printProgress )
{
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine( "Starting a new {0} search", GetType().Name );
if ( Improver != null )
{
Console.ForegroundColor = ConsoleColor.DarkGreen;
Console.WriteLine( "Search will use {0} to "
+ "improve each iteration", Improver.GetType().Name );
}
Console.ForegroundColor = ConsoleColor.Green;
Console.Write( "Progress: 0/{0} - 0", graph.Count );
Console.ForegroundColor = ConsoleColor.White;
}
int lastCount = route.Count;
while ( route.Count < graph.Count )
{
int vIndex = ChooseNext( route );
route.Insert( vIndex, ChooseIndex( route, vIndex ) );
lastCount = route.Count;
if ( Improver != null )
Improver.Improve( route, false );
if ( printProgress )
{
Console.CursorLeft = 10;
Console.Write( "{0}/{1} - {2} ",
route.Count, graph.Count, route.Length );
}
}
if ( printProgress )
{
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine( "\n{0} search complete", GetType().Name );
Console.ForegroundColor = ConsoleColor.White;
}
return route;
}
private static Route RunSearch( Graph graph, ISearcher searcher, Route route = null, bool quiet = false )
{
if ( searcher is HillClimbSearcher && route != null )
{
route = new Route( route );
_stopwatch.Restart();
( (HillClimbSearcher) searcher ).Improve( route, !quiet );
_stopwatch.Stop();
}
else
{
_stopwatch.Restart();
route = searcher.Search( graph, !quiet );
_stopwatch.Stop();
}
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine( "Search time: {0}ms", _stopwatch.ElapsedMilliseconds );
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine( route.ToString() );
return route;
}
public Route Search(Graph graph, bool printProgress = false)
{
if (printProgress) {
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine("Starting a new {0} search with {1} thread{2}", GetType().Name,
Threads, Threads != 1 ? "s" : "");
Console.ForegroundColor = ConsoleColor.DarkGreen;
Console.WriteLine("Search will use {0} for each iteration", Searcher.GetType().Name);
Console.ForegroundColor = ConsoleColor.Green;
Console.Write("Progress: 0/{0} - 0", Attempts);
Console.ForegroundColor = ConsoleColor.White;
}
Route best = null;
int attempt = 0;
int exited = 0;
Func<bool> next = () => {
lock (this) {
if (attempt < Attempts) {
++attempt;
return true;
}
return false;
}
};
Func<bool> hasNext = () => {
lock (this)
return attempt < Attempts;
};
Func<bool> ended = () => {
lock (this)
return exited == Threads;
};
Action exit = () => {
lock (this)
++exited;
};
Action rejoin = () => {
lock (this)
--exited;
};
Func<bool> waitForEnd = () => {
exit();
while (!hasNext() && !ended())
Thread.Yield();
if (!ended()) {
rejoin();
return false;
} else
return true;
};
Action<Route> compare = (route) => {
lock (this) {
if (best == null || route.Length < best.Length) {
best = new Route(route);
attempt = 0;
if (BetterRouteFound != null)
BetterRouteFound(this, new BetterRouteFoundEventArgs(route));
} else if (attempt % (Attempts >> 4) == 0)
_rand = new Random();
if (printProgress) {
Console.CursorLeft = 10;
Console.Write("{0}/{1} - {2} ", attempt, Attempts, best.Length);
}
}
};
ThreadStart loop = () => {
Route route = new Route(graph);
for (; ; ) {
while (next()) {
route.Clear();
for (int i = 0; i < graph.Count; ++i) {
lock (_rand) route.AddEnd(_rand.Next(i, graph.Count));
Searcher.Improve(route);
}
compare(route);
}
if (waitForEnd())
break;
}
};
Thread[] workers = new Thread[Threads - 1];
for (int i = 0; i < workers.Length; ++i) {
workers[i] = new Thread(loop);
workers[i].Start();
}
loop();
if (printProgress) {
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine("\n{0} search complete", GetType().Name);
Console.ForegroundColor = ConsoleColor.White;
}
return best;
}
public virtual Route Search( Graph graph, bool printProgress = false )
{
Route route = Route.CreateDefault( graph );
Improve( route, printProgress );
return route;
}
