initial commit for AI opponent using ISMCTS

ISMCTS.py

@@ -0,0 +1,332 @@
+# This is a very simple Python 2.7 implementation of the Information Set Monte Carlo Tree Search algorithm.
+# The function ISMCTS(rootstate, itermax, verbose = False) is towards the bottom of the code.
+# It aims to have the clearest and simplest possible code, and for the sake of clarity, the code
+# is orders of magnitude less efficient than it could be made, particularly by using a 
+# state.GetRandomMove() or state.DoRandomRollout() function.
+# 
+# An example GameState classes for Knockout Whist is included to give some idea of how you
+# can write your own GameState to use ISMCTS in your hidden information game.
+# 
+# Written by Peter Cowling, Edward Powley, Daniel Whitehouse (University of York, UK) September 2012 - August 2013.
+# 
+# Licence is granted to freely use and distribute for any sensible/legal purpose so long as this comment
+# remains in any distributed code.
+# 
+# For more information about Monte Carlo Tree Search check out our web site at www.mcts.ai
+# Also read the article accompanying this code at ***URL HERE***
+
+from math import *
+import random, sys
+from game import Game as UNOGame
+from player import Player as UNOPlayer
+from utils import list_subtract_unsorted
+import card as c
+
+
+class GameState:
+    """ A state of the game, i.e. the game board. These are the only functions which are
+        absolutely necessary to implement ISMCTS in any imperfect information game,
+        although they could be enhanced and made quicker, for example by using a
+        GetRandomMove() function to generate a random move during rollout.
+        By convention the players are numbered 1, 2, ..., self.numberOfPlayers.
+    """
+
+    def __init__(self):
+        pass
+
+    def GetNextPlayer(self, p):
+        """ Return the player to the left of the specified player
+        """
+        raise NotImplementedError()
+
+    def Clone(self):
+        """ Create a deep clone of this game state.
+        """
+        raise NotImplementedError()
+
+    def CloneAndRandomize(self, observer):
+        """ Create a deep clone of this game state, randomizing any information not visible to the specified observer player.
+        """
+        raise NotImplementedError()
+
+    def DoMove(self, move):
+        """ Update a state by carrying out the given move.
+            Must update playerToMove.
+        """
+        raise NotImplementedError()
+
+    def GetMoves(self):
+        """ Get all possible moves from this state.
+        """
+        raise NotImplementedError()
+
+    def GetResult(self, player):
+        """ Get the game result from the viewpoint of player.
+        """
+        raise NotImplementedError()
+
+    def __repr__(self):
+        """ Don't need this - but good style.
+        """
+        pass
+
+
+class UNOState(GameState):
+    """ A state of the game UNO.
+    """
+
+    def __init__(self, game):
+        """ Initialise the game state. n is the number of players (from 2 to 7).
+        """
+        self.game = game
+
+    @property
+    def playerToMove(self):
+        return self.game.current_player
+
+    @property
+    def numberOfPlayers(self):
+        return len(self.game.players)
+
+    def CloneAndRandomize(self, observer):
+        """ Create a deep clone of this game state.
+        """
+        game = UNOGame(None)
+        game.deck.cards.append(game.last_card)
+        game.draw_counter = self.game.draw_counter
+
+        game.last_card = self.game.last_card
+
+        game.deck.cards = list_subtract_unsorted(game.deck.cards,
+                                                 self.game.deck.graveyard)
+        game.deck.graveyard = list(self.game.deck.graveyard)
+
+        for player in self.game.players:
+            p = UNOPlayer(game, None)
+            if player is observer:
+                p.cards = list(player.cards)
+            else:
+                for i in range(len(player.cards)):
+                    p.cards.append(game.deck.draw())
+
+        return UNOState(game)
+
+    def DoMove(self, move):
+        """ Update a state by carrying out the given move.
+            Must update playerToMove.
+        """
+        if move == 'draw':
+            for n in range(self.game.draw_counter or 1):
+                self.game.current_player.cards.append(
+                    self.game.deck.draw()
+                )
+
+            self.game.draw_counter = 0
+            self.game.turn()
+        else:
+            self.game.current_player.cards.remove(move)
+
+            self.game.play_card(move)
+            if move.special:
+                self.game.turn()
+                self.game.choosing_color = False
+
+    def GetMoves(self):
+        """ Get all possible moves from this state.
+        """
+        if self.game.current_player.cards:
+            playable = self.game.current_player.playable_cards()
+            playable_converted = list()
+            for card in playable:
+                if not card.color:
+                    for color in c.COLORS:
+                        playable_converted.append(
+                            c.Card(color, None, card.special)
+                        )
+                else:
+                    playable_converted.append(card)
+
+            # playable_converted.append('draw')
+            return playable_converted or ['draw']
+        else:
+            return list()
+
+    def GetResult(self, player):
+        """ Get the game result from the viewpoint of player.
+        """
+        return 1 if not player.cards else 0
+
+    def __repr__(self):
+        """ Return a human-readable representation of the state
+        """
+        return '\n'.join(
+            ['%s: %s' % (p.user, [str(c) for c in p.cards])
+             for p in self.game.players]
+        ) + "\nDeck: %s" % str([str(crd) for crd in self.game.deck.cards]) \
+          + "\nGrav: %s" % str([str(crd) for crd in self.game.deck.graveyard])
+
+
+class Node:
+    """ A node in the game tree. Note wins is always from the viewpoint of playerJustMoved.
+    """
+
+    def __init__(self, move=None, parent=None, playerJustMoved=None):
+        self.move = move  # the move that got us to this node - "None" for the root node
+        self.parentNode = parent  # "None" for the root node
+        self.childNodes = []
+        self.wins = 0
+        self.visits = 0
+        self.avails = 1
+        self.playerJustMoved = playerJustMoved  # the only part of the state that the Node needs later
+
+    def GetUntriedMoves(self, legalMoves):
+        """ Return the elements of legalMoves for which this node does not have children.
+        """
+
+        # Find all moves for which this node *does* have children
+        triedMoves = [child.move for child in self.childNodes]
+
+        # Return all moves that are legal but have not been tried yet
+        return [move for move in legalMoves if move not in triedMoves]
+
+    def UCBSelectChild(self, legalMoves, exploration=0.7):
+        """ Use the UCB1 formula to select a child node, filtered by the given list of legal moves.
+            exploration is a constant balancing between exploitation and exploration, with default value 0.7 (approximately sqrt(2) / 2)
+        """
+
+        # Filter the list of children by the list of legal moves
+        legalChildren = [child for child in self.childNodes if
+                         child.move in legalMoves]
+
+        # Get the child with the highest UCB score
+        s = max(legalChildren, key=lambda c: float(c.wins) / float(
+            c.visits) + exploration * sqrt(log(c.avails) / float(c.visits)))
+
+        # Update availability counts -- it is easier to do this now than during backpropagation
+        for child in legalChildren:
+            child.avails += 1
+
+        # Return the child selected above
+        return s
+
+    def AddChild(self, m, p):
+        """ Add a new child node for the move m.
+            Return the added child node
+        """
+        n = Node(move=m, parent=self, playerJustMoved=p)
+        self.childNodes.append(n)
+        return n
+
+    def Update(self, terminalState):
+        """ Update this node - increment the visit count by one, and increase the win count by the result of terminalState for self.playerJustMoved.
+        """
+        self.visits += 1
+        if self.playerJustMoved is not None:
+            self.wins += terminalState.GetResult(self.playerJustMoved)
+
+    def __repr__(self):
+        return "[M:%s W/V/A: %4i/%4i/%4i]" % (
+        self.move, self.wins, self.visits, self.avails)
+
+    def TreeToString(self, indent):
+        """ Represent the tree as a string, for debugging purposes.
+        """
+        s = self.IndentString(indent) + str(self)
+        for c in self.childNodes:
+            s += c.TreeToString(indent + 1)
+        return s
+
+    def IndentString(self, indent):
+        s = "\n"
+        for i in range(1, indent + 1):
+            s += "| "
+        return s
+
+    def ChildrenToString(self):
+        s = ""
+        for c in self.childNodes:
+            s += str(c) + "\n"
+        return s
+
+
+def ISMCTS(rootstate, itermax, verbose=False):
+    """ Conduct an ISMCTS search for itermax iterations starting from rootstate.
+        Return the best move from the rootstate.
+    """
+
+    rootnode = Node()
+
+    for i in range(itermax):
+        node = rootnode
+
+        # Determinize
+        state = rootstate.CloneAndRandomize(rootstate.playerToMove)
+
+        # Select
+        while state.GetMoves() != [] and node.GetUntriedMoves(
+                state.GetMoves()) == []:  # node is fully expanded and non-terminal
+            node = node.UCBSelectChild(state.GetMoves())
+            state.DoMove(node.move)
+
+        # Expand
+        untriedMoves = node.GetUntriedMoves(state.GetMoves())
+        if untriedMoves != []:  # if we can expand (i.e. state/node is non-terminal)
+            m = random.choice(untriedMoves)
+            player = state.playerToMove
+            state.DoMove(m)
+            node = node.AddChild(m, player)  # add child and descend tree
+
+        # Simulate
+        while state.GetMoves() != []:  # while state is non-terminal
+            state.DoMove(random.choice(state.GetMoves()))
+
+        # Backpropagate
+        while node != None:  # backpropagate from the expanded node and work back to the root node
+            node.Update(state)
+            node = node.parentNode
+
+    # Output some information about the tree - can be omitted
+    if (verbose):
+        print(rootnode.TreeToString(0))
+    else:
+        print(rootnode.ChildrenToString())
+
+    return max(rootnode.childNodes, key=lambda
+        c: c.visits).move  # return the move that was most visited
+
+
+def PlayGame():
+    """ Play a sample game between two ISMCTS players.
+        *** This is only a demo and not used by the actual bot ***
+    """
+    game = UNOGame(None)
+    me = UNOPlayer(game, "Player 1")
+    UNOPlayer(game, "Player 2")
+    UNOPlayer(game, "Player 3")
+    UNOPlayer(game, "Player 4")
+    UNOPlayer(game, "Player 5")
+
+    state = UNOState(game)
+
+    while (state.GetMoves() != []):
+        print(str(state))
+        # Use different numbers of iterations (simulations, tree nodes) for different players
+        m = ISMCTS(rootstate=state, itermax=10, verbose=False)
+        # if state.playerToMove is me:
+        #     m = ISMCTS(rootstate=state, itermax=1000, verbose=False)
+        # else:
+        #     m = ISMCTS(rootstate=state, itermax=100, verbose=False)
+        print("Best Move: " + str(m) + "\n")
+        state.DoMove(m)
+
+    someoneWon = False
+    for p in game.players:
+        if state.GetResult(p) > 0:
+            print("Player " + str(p) + " wins!")
+            someoneWon = True
+    if not someoneWon:
+        print("Nobody wins!")
+
+
+if __name__ == "__main__":
+    PlayGame()

bot.py

@@ -34,20 +34,13 @@ from credentials import TOKEN, BOTAN_TOKEN
 from start_bot import start_bot
 from results import *
 from utils import *
+from player import Player  # for ai players
 
 logging.basicConfig(
     format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
-    level=logging.DEBUG)
+    level=logging.WARNING)
 logger = logging.getLogger(__name__)
 
-gm = GameManager()
-u = Updater(token=TOKEN, workers=32)
-dp = u.dispatcher
-
-botan = False
-if BOTAN_TOKEN:
-    botan = Botan(BOTAN_TOKEN)
-
 help_text = ("Follow these steps:\n\n"
              "1. Add this bot to a group\n"
              "2. In the group, start a new game with /new or join an already"
@@ -80,6 +73,7 @@ source_text = ("This bot is Free Software and licensed under the AGPL. "
                "The code is available here: \n"
                "https://github.com/jh0ker/mau_mau_bot")
 
+ai_iterations = 100
 
 @run_async
 def send_async(bot, *args, **kwargs):
@@ -92,6 +86,17 @@ def send_async(bot, *args, **kwargs):
         error(None, None, e)
 
 
+@run_async
+def sticker_async(bot, *args, **kwargs):
+    if 'timeout' not in kwargs:
+        kwargs['timeout'] = 2.5
+
+    try:
+        bot.sendSticker(*args, **kwargs)
+    except Exception as e:
+        error(None, None, e)
+
+
 @run_async
 def answer_async(bot, *args, **kwargs):
     if 'timeout' not in kwargs:
@@ -154,6 +159,29 @@ def join_game(bot, update):
                        reply_to_message_id=update.message.message_id)
 
 
+def add_ai(bot, update):
+    """ Handler for the /add_ai command """
+    chat_id = update.message.chat_id
+    if update.message.chat.type == 'private':
+        help(bot, update)
+    else:
+        try:
+            game = gm.chatid_games[chat_id][-1]
+            if not game.open:
+                send_async(bot, chat_id, text="The lobby is closed")
+                return
+            else:
+                Player(game, None, ai=True)
+                send_async(bot, chat_id,
+                           text="Added computer player",
+                           reply_to_message_id=update.message.message_id)
+        except (KeyError, IndexError):
+            send_async(bot, chat_id,
+                       text="No game is running at the moment. "
+                            "Create a new game with /new",
+                       reply_to_message_id=update.message.message_id)
+
+
 def leave_game(bot, update):
     """ Handler for the /leave command """
     chat_id = update.message.chat_id
@@ -180,6 +208,7 @@ def leave_game(bot, update):
                        text="Okay. Next Player: " +
                             display_name(game.current_player.user),
                        reply_to_message_id=update.message.message_id)
+            ai_turn(bot, game)
         else:
             send_async(bot, chat_id, text="You are not playing in a game in "
                                           "this group.",
@@ -262,6 +291,7 @@ def start_game(bot, update, args):
                        text="First player: %s\n"
                             "Use /close to stop people from joining the game."
                             % display_name(game.current_player.user))
+            ai_turn(bot, game)
     elif len(args) and args[0] == 'select':
         players = gm.userid_players[update.message.from_user.id]
 
@@ -370,6 +400,7 @@ def skip_player(bot, update):
                                        display_name(
                                            game.current_player.next.user)))
                     game.turn()
+                    ai_turn(bot, game)
                     return
 
                 elif len(game.players) > 2:
@@ -382,6 +413,7 @@ def skip_player(bot, update):
                                            game.current_player.next.user)))
 
                     gm.leave_game(game.current_player.user, chat_id)
+                    ai_turn(bot, game)
                     return
                 else:
                     send_async(bot, chat_id,
@@ -511,6 +543,7 @@ def process_result(bot, update):
     if game in gm.chatid_games.get(chat_id, list()):
         send_async(bot, chat_id, text="Next player: " +
                                       display_name(game.current_player.user))
+        ai_turn(bot, game)
 
 
 def reset_waiting_time(bot, chat_id, player):
@@ -555,7 +588,10 @@ def do_draw(game, player):
 
 
 def do_call_bluff(bot, chat_id, game, player):
-    if player.prev.bluffing:
+    if player.prev.ai:
+        send_async(bot, chat_id, text="Computer doesn't know bluffing yet")
+        return
+    elif player.prev.bluffing:
         send_async(bot, chat_id, text="Bluff called! Giving %d cards to %s"
                                       % (game.draw_counter,
                                          player.prev.user.first_name))
@@ -570,24 +606,76 @@ def do_call_bluff(bot, chat_id, game, player):
             player.cards.append(game.deck.draw())
     game.draw_counter = 0
     game.turn()
+    ai_turn(bot, game)
 
 
-# Add all handlers to the dispatcher and run the bot
-dp.addHandler(InlineQueryHandler(reply_to_query))
-dp.addHandler(ChosenInlineResultHandler(process_result))
-dp.addHandler(CallbackQueryHandler(select_game))
-dp.addHandler(CommandHandler('start', start_game, pass_args=True))
-dp.addHandler(CommandHandler('new', new_game))
-dp.addHandler(CommandHandler('join', join_game))
-dp.addHandler(CommandHandler('leave', leave_game))
-dp.addHandler(CommandHandler('open', open_game))
-dp.addHandler(CommandHandler('close', close_game))
-dp.addHandler(CommandHandler('skip', skip_player))
-dp.addHandler(CommandHandler('help', help))
-dp.addHandler(CommandHandler('source', source))
-dp.addHandler(CommandHandler('news', news))
-dp.addHandler(MessageHandler([Filters.status_update], status_update))
-dp.addErrorHandler(error)
+def ai_turn(bot, game):
+    player = game.current_player
+    while player.ai:
+        reply = ''
 
-start_bot(u)
-u.idle()
+        from ISMCTS import UNOState, ISMCTS
+        chat_id = game.chat.id
+        state = UNOState(game)
+        move = ISMCTS(state, itermax=ai_iterations, verbose=False)
+        if move == 'draw':
+            reply += 'Drawing\n'
+        else:
+            sticker_async(bot, chat_id,
+                          sticker=c.STICKERS[str(move)])
+            if move.special:
+                reply += "Choosing color: %s\n" % display_color(move.color)
+
+        state.DoMove(move)
+        if len(player.cards) == 1:
+            reply += "UNO!\n"
+        if len(player.cards) == 0:
+            reply += "%s won!\n" % player.user.first_name
+            if len(game.players) < 3:
+                reply += "Game ended!"
+                gm.end_game(chat_id, player.next.user)
+            else:
+                player.leave()
+
+        player = game.current_player
+        if game in gm.chatid_games.get(chat_id, list()):
+            reply += "Next player: " + display_name(player.user)
+
+        send_async(bot, chat_id, text=reply)
+
+
+def set_ai_iterations(bot, update, args):
+    global ai_iterations
+    ai_iterations = int(args[0])
+
+
+if __name__ == '__main__':
+    gm = GameManager()
+    u = Updater(token=TOKEN, workers=32)
+    dp = u.dispatcher
+
+    botan = False
+    if BOTAN_TOKEN:
+        botan = Botan(BOTAN_TOKEN)
+
+    # Add all handlers to the dispatcher and run the bot
+    dp.addHandler(InlineQueryHandler(reply_to_query))
+    dp.addHandler(ChosenInlineResultHandler(process_result))
+    dp.addHandler(CallbackQueryHandler(select_game))
+    dp.addHandler(CommandHandler('start', start_game, pass_args=True))
+    dp.addHandler(CommandHandler('new', new_game))
+    dp.addHandler(CommandHandler('join', join_game))
+    dp.addHandler(CommandHandler('add_ai', add_ai))
+    dp.addHandler(CommandHandler('set_ai', set_ai_iterations, pass_args=True))
+    dp.addHandler(CommandHandler('leave', leave_game))
+    dp.addHandler(CommandHandler('open', open_game))
+    dp.addHandler(CommandHandler('close', close_game))
+    dp.addHandler(CommandHandler('skip', skip_player))
+    dp.addHandler(CommandHandler('help', help))
+    dp.addHandler(CommandHandler('source', source))
+    dp.addHandler(CommandHandler('news', news))
+    dp.addHandler(MessageHandler([Filters.status_update], status_update))
+    dp.addErrorHandler(error)
+
+    start_bot(u)
+    u.idle()

card.py

@@ -114,7 +114,15 @@ STICKERS = {
     'y_skip': 'BQADBAADQwIAAl9XmQABO_AZKtxY6IMC',
     'y_reverse': 'BQADBAADQQIAAl9XmQABZdQFahGG6UQC',
     'draw_four': 'BQADBAAD9QEAAl9XmQABVlkSNfhn76cC',
+    'draw_four_r': 'BQADBAAD9QEAAl9XmQABVlkSNfhn76cC',
+    'draw_four_b': 'BQADBAAD9QEAAl9XmQABVlkSNfhn76cC',
+    'draw_four_g': 'BQADBAAD9QEAAl9XmQABVlkSNfhn76cC',
+    'draw_four_y': 'BQADBAAD9QEAAl9XmQABVlkSNfhn76cC',
     'colorchooser': 'BQADBAAD8wEAAl9XmQABl9rUOPqx4E4C',
+    'colorchooser_r': 'BQADBAAD8wEAAl9XmQABl9rUOPqx4E4C',
+    'colorchooser_b': 'BQADBAAD8wEAAl9XmQABl9rUOPqx4E4C',
+    'colorchooser_g': 'BQADBAAD8wEAAl9XmQABl9rUOPqx4E4C',
+    'colorchooser_y': 'BQADBAAD8wEAAl9XmQABl9rUOPqx4E4C',
     'option_draw': 'BQADBAADzAIAAl9XmQABTkPaOqA5HIMC',
     'option_pass': 'BQADBAADzgIAAl9XmQABWSDq3RIg3c0C',
     'option_bluff': 'BQADBAADygIAAl9XmQABJoLfB9ntI2UC',
@@ -191,6 +199,9 @@ class Card(object):
 
     def __str__(self):
         if self.special:
+            if self.color:
+                return '%s_%s' % (self.special, self.color)
+            else:
                 return self.special
         else:
             return '%s_%s' % (self.color, self.value)
@@ -206,7 +217,14 @@ class Card(object):
 
     def __eq__(self, other):
         """ Needed for sorting the cards """
-        return str(self) == str(other)
+        s1 = str(self)
+        s2 = str(other)
+        return (s1 == s2
+                if not self.special else
+                s1 == s2 or
+                s1[:-2] == s2[:-2] or
+                s1[:-2] == s2 or
+                s1 == s2[:-2])
 
     def __lt__(self, other):
         """ Needed for sorting the cards """

deck.py

@@ -53,6 +53,8 @@ class Deck(object):
         """ Draw a card from this deck """
         try:
             card = self.cards.pop()
+            if card.special:
+                card = Card(None, None, card.special)
             self.logger.debug("Drawing card " + str(card))
             return card
         except IndexError:
@@ -63,4 +65,6 @@ class Deck(object):
 
     def dismiss(self, card):
         """ All played cards should be returned into the deck """
+        # if card.special:
+        #     card.color = None
         self.graveyard.append(card)

game.py

@@ -40,7 +40,7 @@ class Game(object):
         self.last_card = self.deck.draw()
 
         while self.last_card.special:
-            self.deck.dismiss(self.last_card)
+            self.deck.cards.append(self.last_card)
             self.deck.shuffle()
             self.last_card = self.deck.draw()
 

game_manager.py

@@ -124,6 +124,8 @@ class GameManager(object):
             return
 
         for player in the_game.players:
+            if player.ai:
+                continue
             this_users_players = self.userid_players[player.user.id]
             this_users_players.remove(player)
             if len(this_users_players) is 0:

player.py

@@ -20,6 +20,8 @@
 import logging
 from datetime import datetime
 
+from telegram import User
+
 import card as c
 
 
@@ -31,7 +33,7 @@ class Player(object):
     other players by placing itself behind the current player.
     """
 
-    def __init__(self, game, user):
+    def __init__(self, game, user, ai=False):
         self.cards = list()
         self.game = game
         self.user = user
@@ -56,6 +58,10 @@ class Player(object):
         self.anti_cheat = 0
         self.turn_started = datetime.now()
         self.waiting_time = 90
+        self.ai = ai
+
+        if ai and not user:
+            self.user = User(-1, "Computer")
 
     def leave(self):
         """ Leave the current game """
@@ -73,10 +79,10 @@ class Player(object):
         self.cards = list()
 
     def __repr__(self):
-        return repr(self.user)
+        return repr(self.user) if not self.ai else "computer"
 
     def __str__(self):
-        return str(self.user)
+        return str(self.user) if not self.ai else "Computer"
 
     @property
     def next(self):

utils.py

@@ -30,6 +30,22 @@ def list_subtract(list1, list2):
     return list(sorted(list1))
 
 
+def list_subtract_unsorted(list1, list2):
+    """ Helper function to subtract two lists and return the sorted result """
+    list1 = list1.copy()
+
+    for x in list2:
+        try:
+            list1.remove(x)
+        except ValueError:
+            print(list1)
+            print(list2)
+            print(x)
+            raise
+
+    return list1
+
+
 def display_name(user):
     """ Get the current players name including their username, if possible """
     user_name = user.first_name