public static bool TreeGetChild(ActionTree tree, ActionTreeNode n, ref int i, out ActionTreeNode child)
{
if (i < n.Children.Count)
{
child = n.Children[i++];
return(true);
}
child = null;
return(false);
}
/// <summary>
/// Build a tree for position pos.
/// </summary>
public void Build(ActionTree atTree, int pos)
{
//GetChild = (GenTree t, DeckGenNode n, ref int i, out DeckGenNode c) =>
// {
// GenNode c1;
// GenTree.TreeGetChild(t, n, ref i, out c)
// };
_pos = pos;
_atTree = atTree;
_atTree.Positions[pos] = new ActionTreeNode();
GenTree genTree = new GenTree {
GameDef = _atTree.GameDef, Kind = GenTree.TreeKind.ActionTree
};
DeckGenNode genRoot = new DeckGenNode(genTree, 2);
NodesCount = 0;
Walk(genTree, genRoot);
}
public static void DoMonteCarlo(
ActionTree tree,
int ourPos,
CardSet pocket,
int round,
string sharedCardsAsString,
List <ActionTreeNode> strategyPath,
int repetitionsCount)
{
string[] sharedCards = sharedCardsAsString.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
ActionTreeNode curStrategyNode = strategyPath[strategyPath.Count - 1];
// Here we sometimes use the knowledge about the game definition.
_clearValues.Walk(tree, curStrategyNode);
MonteCarloData[] mc = new MonteCarloData[tree.GameDef.RoundsCount];
for (int r = 0; r < mc.Length; ++r)
{
mc[r] = new MonteCarloData();
}
// Fill known public data.
for (int r = 1; r <= round; ++r)
{
int sharedCount = tree.GameDef.SharedCardsCount[r];
mc[r].boardSize = mc[r - 1].boardSize + sharedCount;
mc[r].shared = StdDeck.Descriptor.GetCardSet(sharedCards, mc[r - 1].boardSize, sharedCount);
mc[r].board = mc[r - 1].board | mc[r].shared;
Debug.Assert(mc[r].shared.CountCards() == sharedCount);
Debug.Assert(mc[r].board.CountCards() == mc[r].boardSize);
}
Debug.Assert(mc[round].boardSize == sharedCards.Length);
MonteCarloDealer mcDealer = new MonteCarloDealer();
ApplyMonteCarloData applyMc = new ApplyMonteCarloData();
mcDealer.Initialize(pocket | mc[round].board);
Debug.Assert(mcDealer.Cards.Length + pocket.CountCards() + mc[round].boardSize == 52);
for (int repetition = 0; repetition < repetitionsCount * 10; ++repetition)
{
mcDealer.Shuffle(7); // 2 for opponent, up to 5 for the board
CardSet mcPocket = StdDeck.Descriptor.GetCardSet(mcDealer.Cards, 0, 2);
Debug.Assert(mc[0].board.IsEmpty());
int sharedDealt = 0;
for (int r = 0; r < tree.GameDef.RoundsCount; ++r)
{
if (r > round)
{
mc[r].boardSize = mc[r - 1].boardSize + tree.GameDef.SharedCardsCount[r];
mc[r].shared = StdDeck.Descriptor.GetCardSet(mcDealer.Cards, 2 + sharedDealt, tree.GameDef.SharedCardsCount[r]);
sharedDealt += tree.GameDef.SharedCardsCount[r];
Debug.Assert(!mc[r - 1].board.Contains(mc[r].shared));
Debug.Assert(!mcPocket.Contains(mc[r].shared));
mc[r].board = mc[r - 1].board | mc[r].shared;
}
mc[r].bucket = tree.Bucketizer.GetBucket(mcPocket, mc[r].board, r);
}
double strategyFactor = 1;
// Go through the strategy path, skip the b-node
Debug.Assert(strategyPath[0].ActionKind == Ak.b);
// Start from pos. 2 to skip deals (where OppBuckets always contains 0s if ourPos == 0).
for (int pathIndex = 2; pathIndex < strategyPath.Count; pathIndex++)
{
ActionTreeNode pathNode = strategyPath[pathIndex];
Debug.Assert(pathNode.ActionKind != Ak.b);
// Take nodes where opponent acts.
if (pathNode.State.CurrentActor == 1 - ourPos)
{
// nextNode always exists because this function is called when we act
ActionTreeNode nextNode = strategyPath[pathIndex + 1];
Debug.Assert(pathNode.State.Round == nextNode.State.Round);
int freq = pathNode.OppBuckets.Counts[mc[pathNode.State.Round].bucket];
int nextFreq = nextNode.OppBuckets.Counts[mc[pathNode.State.Round].bucket];
double coef = freq == 0 ? 0 : (double)nextFreq / freq;
strategyFactor *= coef;
}
}
if (strategyFactor > 0)
{
int showdownValue = Showdown(pocket, mcPocket,
mc[tree.GameDef.RoundsCount - 1].board,
mc[tree.GameDef.RoundsCount - 1].boardSize + 2);
applyMc.ApplyData(curStrategyNode, mc, ourPos, showdownValue, strategyFactor);
repetition += 9;
}
}
FinalizeMonteCarloData finalizer = new FinalizeMonteCarloData();
finalizer.Finalize(tree, curStrategyNode, ourPos);
}