/// <summary>
/// Runs the example
/// </summary>
public static void Run()
{
var tiles = new MazeTile[10, 10];
tiles[0, 0] = MazeTile.Agent;
tiles[2, 4] = MazeTile.Wall;
tiles[3, 4] = MazeTile.Wall;
tiles[4, 4] = MazeTile.Wall;
tiles[5, 4] = MazeTile.Wall;
tiles[9, 9] = MazeTile.Goal;
var environment = new MazeEnvironment(new Configuration(200), tiles);
var agent = new MazeAgent();
environment.AddAgent(agent);
environment.Initialize();
for (int episode = 0; episode < environment.Config.MaxEpisodes; episode++)
{
environment.Reset(episode);
for (int step = 0; step < 1000; step++)
{
if (environment.Update(episode))
{
break;
}
}
Console.WriteLine(string.Format("Episode: {0} - {1} steps.", episode, agent.NumSteps));
}
PrintPath(environment, agent);
Console.ReadLine();
}
/// <summary>
/// Prints the best path
/// </summary>
private static void PrintPath(MazeEnvironment environment, MazeAgent agent)
{
var learner = agent.Learner as QLearning <MazeState>;
var path = new HashSet <MazeState>();
MazeState state = environment.GetDefaultState(agent);
path.Add(state);
while (true)
{
MazeAction action = (MazeAction)learner.SelectAction(state);
switch (action)
{
case MazeAction.Up:
state = state.Add(y: -1);
break;
case MazeAction.Down:
state = state.Add(y: 1);
break;
case MazeAction.Right:
state = state.Add(x: 1);
break;
case MazeAction.Left:
state = state.Add(x: -1);
break;;
}
path.Add(state);
if (environment.Tiles[state.PositionX, state.PositionY] == MazeTile.Goal)
{
break;
}
}
for (int y = 0; y < environment.Length; y++)
{
for (int x = 0; x < environment.Width; x++)
{
switch (environment.Tiles[x, y])
{
case MazeTile.Floor:
if (path.Contains(new MazeState(x, y)))
{
Console.Write("x");
}
else
{
Console.Write(" ");
}
break;
case MazeTile.Wall:
Console.Write("W");
break;
case MazeTile.Agent:
Console.Write("A");
break;
case MazeTile.Goal:
Console.Write("G");
break;
}
}
Console.WriteLine();
}
}
