/// <summary>
/// Construct a State-Action pair instance
/// </summary>
/// <param name="state">The state</param>
/// <param name="action">The action</param>
public SAPair(GameState state, Direction action) { this.State = state; this.Action = action; }
/// <summary>
/// Initiates the game-play ops
/// </summary>
private void Gameplay()
{
GameState gs = null;
do
{
try
{
byte[] status = new byte[26];
int rcv = this.Channel.Receive(status);
if (rcv == 0) { o("!!Connection Dropped!!"); return; }
gs = new GameState(status);
Direction direction = this.__Leaner.ChooseAction(gs);
this.Channel.Send(this.s2b(((int)direction).ToString()));
o("Moved: {0}", direction.ToString());
}
catch (Exception e) { System.IO.File.AppendAllText("error.log", e.ToString()); o("Exception\n[ ABORT ]"); return; }
} while (gs != null && gs.Game_State != GameState.State.GAME_FINISHED);
o("==== Game Ended ====");
}
/// <summary>
/// Check if the state is in front of a gate
/// </summary>
/// <param name="s">The game's state</param>
/// <param name="opGate">`true` to check if the state is in front of opponent's gate; otherwise `false` to check if the state is in front of mine gate</param>
/// <returns>True if state is in front of a gate</returns>
public bool IsInFrontOfGate(GameState s, bool opGate = true)
{
var gColumn = 9;
var g1 = new System.Drawing.Point(3, gColumn);
var g2 = new System.Drawing.Point(4, gColumn);
if (!opGate)
{
g1 = new System.Drawing.Point(3, 1);
g2 = new System.Drawing.Point(4, 1);
}
return s.MyLocation == g1 || s.MyLocation == g2;
}
/// <summary>
/// Executes ops and returns a movement direction based on game's status
/// </summary>
/// <param name="gameState">The game status</param>
/// <returns>The direction</returns>
public Direction ChooseAction(GameState gameState)
{
try
{
// Next-State Max Q Pair List
List<KeyValuePair<KeyValuePair<float, float>, Direction>> nsmqpl = new List<KeyValuePair<KeyValuePair<float, float>, Direction>>();
// Next-State All Possible Q Pair List
List<KeyValuePair<KeyValuePair<float, float>, Direction>> nsAPqpl = new List<KeyValuePair<KeyValuePair<float, float>, Direction>>();
// Next-State Max Q Pair
KeyValuePair<KeyValuePair<float, float>, Direction> nsmqp = new KeyValuePair<KeyValuePair<float, float>, Direction>(new KeyValuePair<float, float>(float.NegativeInfinity, float.NegativeInfinity), Direction.HOLD);
// foreach valid directions
foreach (Direction direction in this.getValidDirections(gameState))
{
// fetch the Next-State Q Value.
var nsqv = new KeyValuePair<float, float>(this.getQVal(gameState, direction), this.getReward(this.getNextState(gameState, direction), gameState));
// current next-state pair
var cnsp = new KeyValuePair<KeyValuePair<float, float>, Direction>(nsqv, direction);
// add it to all possible next-state list
nsAPqpl.Add(cnsp);
// fetch Next-State Q Value's Value
var nsqvV = nsqv.Key + nsqv.Value;
// fetch Next-State Max Q Pair's Value
var nsmqpV = nsmqp.Key.Key + nsmqp.Key.Value;
// check for MAX value
if ( nsqvV > nsmqpV)
{
nsmqp = cnsp;
// in next `if` statement we will fall-back to
// adding currently updated `nsmqp` into `nsmqpl`.
// but for now we need to clear the list
nsmqpl.Clear();
}
// if current next-state is equal to MAX
if (nsqvV == nsmqp.Key.Key + nsmqp.Key.Value)
// add it to MAX list too
nsmqpl.Add(cnsp);
}
// init the candidate index
int candIndex = -1;
// candidate container
KeyValuePair<KeyValuePair<float, float>, Direction> candidate = new KeyValuePair<KeyValuePair<float, float>, Direction>();
// while there is a item in list
while (nsmqpl.Count != 0)
{
// pick a randon index
lock (this.RandGen) candIndex = this.RandGen.Next(0, nsmqpl.Count);
// pick a random candidate
candidate = nsmqpl[candIndex];
// validate the mutation factor
// why the THRESHOLD is {10}? because we should give the agent the chance
// if he wants to cross-pass the whole horizon with one direction without
// getting intruptted by mutation factor.
if (this.getMutationVal(gameState, candidate.Value) < 10) goto __PROCEED;
// remove the current
nsmqpl.RemoveAt(candIndex);
}
/**
* If we reach here it means me have failed to pick a direction
* and we have fell into a action-loop and we need to pick a new
* random action to break the action-loop.
*/
// get an index from all possible state-action list
lock (this.RandGen) candIndex = this.RandGen.Next(0, nsAPqpl.Count);
// make the random choosen as candidate
candidate = nsAPqpl[candIndex];
__PROCEED:
// update the mution factor for current state
this.updateMutaionFactor(gameState, candidate.Value);
// the New Q Value
var nQv = this.getReward(gameState) + Learner.GAMMA * (candidate.Key.Key + candidate.Key.Value);
// update the Q value
this.updateQ(
gameState, // The state
candidate.Value, // The direction
nQv // The update value
);
// any of players scored?
if (gameState.Game_State == GameState.State.OPPONENT_SCORED ||
gameState.Game_State == GameState.State.PLAYER_SCORED)
// re-init previous mutation factor container
this.PrevMutationfactor = new KeyValuePair<SAPair, uint>();
// we don't need to create a full-stack property
if (this.GameStates.Count > 0)
// pop any previously pushed state
this.GameStates.Pop();
// push current game status
this.GameStates.Push(gameState);
//return the candidate's direction;
return candidate.Value;
}
catch (Exception e) { Console.WriteLine(); Console.WriteLine(e.ToString()); Debug.WriteLine(e.ToString()); throw e; }
}
/// <summary>
/// Calculates the distance to goal
/// </summary>
/// <param name="s">Game's status</param>
/// <param name="opGate">Check distance to opponent's gate or mine?</param>
/// <param name="myDist">If `true` calculates my distance to a gate; otherwise calculates the opponent's to a gate</param>
/// <returns>The distance to gate</returns>
protected float CalcDistanceToGate(GameState s, bool opGate = true, bool myDist = true)
{
var gColumn = 10;
var g1 = new System.Drawing.Point(3, gColumn);
var g2 = new System.Drawing.Point(4, gColumn);
if (!opGate)
{
g1 = new System.Drawing.Point(3, 0);
g2 = new System.Drawing.Point(4, 0);
}
var x = s.MyLocation.X;
var y = s.MyLocation.Y;
if (!myDist)
{
x = s.OpponentLocation.X;
y = s.OpponentLocation.Y;
}
var g39 = (float)(Math.Abs(g1.X - x) + Math.Abs(g1.Y - y));
var g49 = (float)(Math.Abs(g2.X - x) + Math.Abs(g2.Y - y));
return Math.Min(g39, g49);
}
/// <summary>
/// Calculates the distance to the ball
/// </summary>
/// <param name="s">Game's status</param>
/// <returns>The distance to ball</returns>
protected float CalcDistanceToBall(GameState s)
{
if (s.IsBallMine) return 0;
var b = s.OpponentLocation;
var x = s.MyLocation.X;
var y = s.MyLocation.Y;
var bd = (float)(Math.Abs(b.X - x) + Math.Abs(b.Y - y));
return bd;
}
/// <summary>
/// Updates the `Mutationfactor` table
/// </summary>
/// <param name="s">The game state</param>
/// <param name="a">The action</param>
/// <param name="val">The mutation factor's value</param>
protected void updateMutaionFactor(GameState s, Direction a)
{
var key = new SAPair(s, a);
uint val = 0;
if (this.PrevMutationfactor.Key != null && this.PrevMutationfactor.Key.GetHashCode() == key.GetHashCode())
val = this.PrevMutationfactor.Value + 1;
this.PrevMutationfactor = new KeyValuePair<SAPair, uint>(key, val);
}
/// <summary>
/// Get `Mutationfactor` for the state-action
/// </summary>
/// <param name="s">For the game state</param>
/// <param name="a">For the action</param>
/// <returns>The mutation factor's value</returns>
protected uint getMutationVal(GameState s, Direction a)
{
if (this.PrevMutationfactor.Key == null) return 0;
var key = new SAPair(s, a);
if (this.PrevMutationfactor.Key.GetHashCode() == key.GetHashCode())
return this.PrevMutationfactor.Value;
return 0;
}
/// <summary>
/// Calculates the `Q` value
/// </summary>
/// <param name="s">For the game state</param>
/// <param name="a">For the action</param>
/// <returns>The `Q` value</returns>
protected float getQVal(GameState s, Direction a)
{
var key = new SAPair(s, a).GetHashCode();
#if __USE_PREPROCESSED_Q__
if (!this._Q.ContainsKey(key))
{
float q = 0;
var ns = this.getNextState(s, a);
if (a == Direction.EAST)
{
if (ns.IsBallMine) q += 5.0F;
else q -= 5.0F;
}
if (ns.Game_State == GameState.State.OPPONENT_SCORED) q = float.NegativeInfinity;
if (ns.Game_State == GameState.State.PLAYER_SCORED) q = float.PositiveInfinity;
this.updateQ(s, a, q);
}
// if making an own-goal
if (this.IsInFrontOfGate(s, false) && s.IsBallMine)
{
if(a == Direction.WEST)
this.updateQ(s, a, float.NegativeInfinity);
}
if (this.IsInFrontOfGate(s, true) && s.IsBallMine)
{
switch (a)
{
case Direction.EAST: this.updateQ(s, a, float.PositiveInfinity); break;
case Direction.HOLD: this.updateQ(s, a, +100); break;
default: this.updateQ(s, a, float.NegativeInfinity); break;
}
}
#endif
if (this._Q.ContainsKey(key))
return _Q[key];
return 0;
}
/// <summary>
/// Updates the `Q` table
/// </summary>
/// <param name="s">The game state</param>
/// <param name="a">The action</param>
/// <param name="val">The value of state-action</param>
protected void updateQ(GameState s, Direction a, float val)
{
var key = new SAPair(s, a).GetHashCode();
if (this._Q.ContainsKey(key))
this._Q[key] = val;
else
this._Q.Add(key, val);
}
/// <summary>
/// Get next state of the game based on an action
/// </summary>
/// <param name="s">Current state of the game</param>
/// <param name="a">The action to apply on current state</param>
/// <returns>The next state</returns>
protected GameState getNextState(GameState s, Direction a)
{
// make a clone of current status
GameState _s = s.Clone() as GameState;
/**
* Update the location of mine by choosing the action
*/
switch (a)
{
case Direction.HOLD: /* return currently cloned state */ return _s;
case Direction.NORTH:
_s.MyLocation = new System.Drawing.Point(_s.MyLocation.X - 1, s.MyLocation.Y);
break;
case Direction.SOUTH:
_s.MyLocation = new System.Drawing.Point(_s.MyLocation.X + 1, s.MyLocation.Y);
break;
case Direction.WEST:
_s.MyLocation = new System.Drawing.Point(_s.MyLocation.X, s.MyLocation.Y - 1);
break;
case Direction.EAST:
_s.MyLocation = new System.Drawing.Point(_s.MyLocation.X, s.MyLocation.Y + 1);
break;
}
// update the status of ball
if (_s.MyLocation == _s.OpponentLocation) _s.IsBallMine = !_s.IsBallMine;
/**
* Update the scores status
*/
if (_s.IsBallMine)
{
if (this.CalcDistanceToGate(s, true, true) == 0) { _s.MyScore++; _s.Game_State = GameState.State.PLAYER_SCORED; }
else if (this.CalcDistanceToGate(s, false, true) == 0) { _s.OpponentScore++; _s.Game_State = GameState.State.OPPONENT_SCORED; }
}
else
{
if (this.CalcDistanceToGate(s, false, false) == 0) { _s.OpponentScore++; _s.Game_State = GameState.State.OPPONENT_SCORED; }
else if (this.CalcDistanceToGate(s, true, false) == 0) { _s.MyScore++; _s.Game_State = GameState.State.PLAYER_SCORED; }
}
return _s;
}
/// <summary>
/// Get reward of passed game status
/// </summary>
/// <param name="gs">The game state</param>
/// <param name="prevgs">[OPTIONAL] The previous game state; If not provided the top of stack will be used!</param>
/// <returns>The related reward for passed game state</returns>
protected float getReward(GameState gs, GameState prevgs = null)
{
// if no previously game state has been recorded
if (this.GameStates.Count == 0) /* NO REWARD AT INIT STATE */ return 0;
// flag that we have peeked prev-gs from stack
bool STACK_PEEKED = (prevgs == null);
// if no previous game state has been provided? select the top of the stack
if (prevgs == null) prevgs = this.GameStates.Peek();
// get reward of current state based on combination of current and previous state's status
float r = 0;
// +100 if i score-up
if (gs.Game_State == GameState.State.PLAYER_SCORED) r += 100.0F;
// -100 if i score-down
if (gs.Game_State == GameState.State.OPPONENT_SCORED) r -= 100.0F;
// dynamic reward if i acquired the bull
if (!prevgs.IsBallMine && gs.IsBallMine)
// it is good to catch the ball nearby the friendly gate
// to prevent the opponent to make a goal
r += 50.0F / this.CalcDistanceToGate(gs, false);
// dynamic reward if i lost the ball
if (prevgs.IsBallMine && !gs.IsBallMine)
// it is worst if we lost the ball nearby the opponent's gate
// to make a goal opportunity
r -= 50.0F / this.CalcDistanceToGate(gs, true);
// if i am in position of the ball
if (gs.IsBallMine)
// make the agent eager to go make a goal
r += (70.0F / this.CalcDistanceToGate(gs, true));
else
// make the agent eager to go and catch the ball
r -= (30.0F * (this.CalcDistanceToBall(gs)));
// if i made an own-goal?
if (STACK_PEEKED && prevgs.IsBallMine && gs.Game_State == GameState.State.OPPONENT_SCORED)
// if i made an own-goal, the direction would be 100% {WEST}.
// if i made an own-goal, update the previous game-state's Q's value to {-INF}
this.updateQ(prevgs, Direction.WEST, float.NegativeInfinity);
// return the reward value
return r;
}
/// <summary>
/// Get valid directions of a game state
/// </summary>
/// <param name="gameState">The game state</param>
/// <returns>The valid game directions</returns>
protected IEnumerable<Direction> getValidDirections(GameState gameState)
{
List<Direction> directions = new List<Direction>() { /* constant direction for any state */ Direction.HOLD };
// if not on horizontal edges?
if (gameState.MyLocation.X > 1 && gameState.MyLocation.X < 6) directions.AddRange(new[] { Direction.NORTH, Direction.SOUTH });
// if on top edge?
if (gameState.MyLocation.X == 1) directions.Add(Direction.SOUTH);
// if on bottom edge?
if (gameState.MyLocation.X == 6) directions.Add(Direction.NORTH);
// if not on vertical edges?
if (gameState.MyLocation.Y > 1 && gameState.MyLocation.Y < 9) directions.AddRange(new[] { Direction.EAST, Direction.WEST });
// if on left edge?
if (gameState.MyLocation.Y == 1) directions.Add(Direction.EAST);
// if on right edge?
if (gameState.MyLocation.Y == 9) directions.Add(Direction.WEST);
// if we are in front if any gate? /* YES: Add a direction to the gate */
// my own gate?
if (gameState.MyLocation.Y == 1 && (gameState.MyLocation.X == 3 || gameState.MyLocation.X == 4)) directions.Add(Direction.WEST);
// opponent's gate?
if (gameState.MyLocation.Y == 9 && (gameState.MyLocation.X == 3 || gameState.MyLocation.X == 4)) directions.Add(Direction.EAST);
// return directions
return directions;
}
