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Arena.py
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Arena.py
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import numpy as np
from pytorch_classification.utils import Bar, AverageMeter
import time
#import os
class Arena():
"""
An Arena class where any 2 agents can be pit against each other.
"""
def __init__(self, player1, player2, game, display=None):
"""
Input:
player 1,2: two functions that takes board as input, return action
game: Game object
display: a function that takes board as input and prints it (e.g.
display in othello/OthelloGame). Is necessary for verbose
mode.
see othello/OthelloPlayers.py for an example. See pit.py for pitting
human players/other baselines with each other.
"""
self.player1 = player1
self.player2 = player2
self.game = game
self.display = display
def playGame(self, verbose=False):
"""
Executes one episode of a game.
Returns:
either
winner: player who won the game (1 if player1, -1 if player2)
or
draw result returned from the game that is neither 1, -1, nor 0.
"""
players = [self.player2, None, self.player1]
curPlayer = 1
board = self.game.getInitBoard()
it = 0
while self.game.getGameEnded(board, curPlayer)==0 and it<200:
it+=1
if verbose:
assert(self.display)
print("Turn ", str(it), "Player ", str(curPlayer))
#self.display(board)
if players[curPlayer+1].__name__ != '<lambda>': # new
#os.system('clear')
self.display(self.game.getCanonicalForm(board, curPlayer), curPlayer)
action = players[curPlayer+1](self.game.getCanonicalForm(board, curPlayer))
valids = self.game.getValidMoves(self.game.getCanonicalForm(board, curPlayer),1)
if valids[action]==0:
return -curPlayer
#print ""
#print(action)
#return 0
assert valids[action] >0
#if verbose:
#print("Action index ", str(action))
board, curPlayer = self.game.getNextState(board, curPlayer, action)
if verbose and players[curPlayer+1].__name__ == '<lambda>': # new
#os.system('clear')
self.display(self.game.getCanonicalForm(board, -curPlayer), -curPlayer)
if verbose:
assert(self.display)
print("Game over: Turn ", str(it), "Result ", str(self.game.getGameEnded(board, 1)))
if verbose and players[curPlayer+1].__name__ == '<lambda>':
self.display(self.game.getCanonicalForm(board, -curPlayer), -curPlayer)
else:
self.display(self.game.getCanonicalForm(board, curPlayer), curPlayer)
#self.display(board)
return self.game.getGameEnded(board, 1)
def playGames(self, num, verbose=False):
"""
Plays num games in which player1 starts num/2 games and player2 starts
num/2 games.
Returns:
oneWon: games won by player1
twoWon: games won by player2
draws: games won by nobody
"""
eps_time = AverageMeter()
bar = Bar('Arena.playGames', max=num)
end = time.time()
eps = 0
maxeps = int(num)
num = int(num/2)
oneWon = 0
twoWon = 0
draws = 0
for _ in range(num):
gameResult = self.playGame(verbose=verbose)
if gameResult==1:
oneWon+=1
elif gameResult==-1:
twoWon+=1
else:
draws+=1
# bookkeeping + plot progress
eps += 1
eps_time.update(time.time() - end)
end = time.time()
bar.suffix = '({eps}/{maxeps}) Eps Time: {et:.3f}s | Total: {total:} | ETA: {eta:}'.format(eps=eps+1, maxeps=maxeps, et=eps_time.avg,
total=bar.elapsed_td, eta=bar.eta_td)
bar.next()
self.player1, self.player2 = self.player2, self.player1
for _ in range(num):
gameResult = self.playGame(verbose=verbose)
if gameResult==-1:
oneWon+=1
elif gameResult==1:
twoWon+=1
else:
draws+=1
# bookkeeping + plot progress
eps += 1
eps_time.update(time.time() - end)
end = time.time()
bar.suffix = '({eps}/{maxeps}) Eps Time: {et:.3f}s | Total: {total:} | ETA: {eta:}'.format(eps=eps+1, maxeps=num, et=eps_time.avg,
total=bar.elapsed_td, eta=bar.eta_td)
bar.next()
bar.finish()
return oneWon, twoWon, draws