backgammon/main.py

import argparse
import sys
import os
import time

# Parse command line arguments
parser = argparse.ArgumentParser(description="Backgammon games")
parser.add_argument('--episodes', action='store', dest='episode_count',
                    type=int, default=1000,
                    help='number of episodes to train')
parser.add_argument('--model', action='store', dest='model',
                    default='default',
                    help='name of Tensorflow model to use')
parser.add_argument('--eval-methods', action='store',
                    default=['random'], nargs='*',
                    help='specifies evaluation methods')
parser.add_argument('--eval', action='store_true',
                    help='evaluate the neural network with a random choice bot')
parser.add_argument('--bench-eval-scores', action='store_true',
                    help='benchmark scores of evaluation measures. episode counts and model specified as options are ignored.')
parser.add_argument('--train', action='store_true',
                    help='train the neural network')
parser.add_argument('--eval-after-train', action='store_true', dest='eval_after_train',
                    help='evaluate after each training session')
parser.add_argument('--play', action='store_true',
                    help='play with the neural network')
parser.add_argument('--start-episode', action='store', dest='start_episode',
                    type=int, default=0,
                    help='episode count to start at; purely for display purposes')
parser.add_argument('--train-perpetually', action='store_true',
                    help='start new training session as soon as the previous is finished')
parser.add_argument('--list-models', action='store_true',
                    help='list all known models')
parser.add_argument('--board-rep', action='store', dest='board_rep',
                    help='name of board representation to use as input to neural network')
parser.add_argument('--verbose', action='store_true',
                    help='If set, a lot of stuff will be printed')
parser.add_argument('--ply', action='store', dest='ply', default='0',
                    help='defines the amount of ply used when deciding what move to make')
parser.add_argument('--repeat-eval', action='store', dest='repeat_eval', default='1',
                    help='the amount of times the evaluation method should be repeated')

args = parser.parse_args()


config = {
    'model': args.model,
    'episode_count': args.episode_count,
    'eval_methods': args.eval_methods,
    'train': args.train,
    'play': args.play,
    'eval': args.eval,
    'bench_eval_scores': args.bench_eval_scores,
    'eval_after_train': args.eval_after_train,
    'start_episode': args.start_episode,
    'train_perpetually': args.train_perpetually,
    'model_storage_path': 'models',
    'bench_storage_path': 'bench',
    'board_representation': args.board_rep,
    'global_step': 0,
    'verbose': args.verbose,
    'ply': args.ply,
    'repeat_eval': args.repeat_eval
}


# Create models folder
if not os.path.exists(config['model_storage_path']):
    os.makedirs(config['model_storage_path'])

model_path = lambda: os.path.join(config['model_storage_path'], config['model'])

# Make sure directories exist
log_path = os.path.join(model_path(), 'logs')
if not os.path.isdir(model_path()):
    os.mkdir(model_path())
if not os.path.isdir(log_path):
    os.mkdir(log_path)

# Define helper functions
def log_train_outcome(outcome, diff_in_values, trained_eps = 0, log_path = os.path.join(model_path(), 'logs', "train.log")):
    format_vars = { 'trained_eps': trained_eps,
                    'count': len(outcome),
                    'sum': sum(outcome),
                    'mean': sum(outcome) / len(outcome),
                    'time': int(time.time()),
                    'average_diff_in_vals': diff_in_values
    }

    with open(log_path, 'a+') as f:
        f.write("{time};{trained_eps};{count};{sum};{mean};{average_diff_in_vals}".format(**format_vars) + "\n")
    

def log_eval_outcomes(outcomes, trained_eps = 0, log_path = os.path.join(model_path(), 'logs', "eval.log")):
    """
    :param outcomes:
    :param average_diff_in_value:
    :param trained_eps:
    :param log_path:
    :return:
    """
    for outcome in outcomes:
        scores = outcome[1]
        format_vars = { 'trained_eps': trained_eps,
                        'method': outcome[0],
                        'count': len(scores),
                        'sum': sum(scores),
                        'mean': sum(scores) / len(scores),
                        'time': int(time.time())
        }
        with open(log_path, 'a+') as f:
            f.write("{time};{method};{trained_eps};{count};{sum};{mean}".format(**format_vars) + "\n")

def log_bench_eval_outcomes(outcomes, log_path, index, time, trained_eps = 0):
    for outcome in outcomes:
        scores = outcome[1]
        format_vars = { 'trained_eps': trained_eps,
                        'method': outcome[0],
                        'count': len(scores),
                        'sum': sum(scores),
                        'mean': sum(scores) / len(scores),
                        'time': time,
                        'index': index,
        }
        with open(log_path, 'a+') as f:
            f.write("{method};{count};{index};{time};{sum};{mean}".format(**format_vars) + "\n")

def find_board_rep():
    checkpoint_path = os.path.join(config['model_storage_path'], config['model'])
    board_rep_path = os.path.join(checkpoint_path, "board_representation")
    with open(board_rep_path, 'r') as f:
        return f.read()


def board_rep_file_exists():
    checkpoint_path = os.path.join(config['model_storage_path'], config['model'])
    board_rep_path = os.path.join(checkpoint_path, "board_representation")
    return os.path.isfile(board_rep_path)

def create_board_rep():
    checkpoint_path = os.path.join(config['model_storage_path'], config['model'])
    board_rep_path = os.path.join(checkpoint_path, "board_representation")
    with open(board_rep_path, 'a+') as f:
        f.write(config['board_representation'])

# Do actions specified by command-line
if args.list_models:
    def get_eps_trained(folder):
        with open(os.path.join(folder, 'episodes_trained'), 'r') as f:
            return int(f.read())
    model_folders = [ f.path
                      for f
                      in os.scandir(config['model_storage_path'])
                      if f.is_dir() ]
    models = [ (folder, get_eps_trained(folder)) for folder in model_folders ]
    sys.stderr.write("Found {} model(s)\n".format(len(models)))
    for model in models:
        sys.stderr.write("  {name}: {eps_trained}\n".format(name = model[0], eps_trained = model[1]))

    exit()

if __name__ == "__main__":
    # Set up network
    from network import Network

    # Set up variables
    episode_count = config['episode_count']

    if config['board_representation'] is None:
        if board_rep_file_exists():
            config['board_representation'] = find_board_rep()
        else:
            sys.stderr.write("Was not given a board_rep and was unable to find a board_rep file\n")
            exit()
    else:
        if not board_rep_file_exists():
            create_board_rep()
        else:
            if config['board_representation'] != find_board_rep():
                sys.stderr.write("Board representation \"{given}\", does not match one in board_rep file, \"{board_rep}\"\n".
                                 format(given = config['board_representation'], board_rep = find_board_rep()))
                exit()

                  
    if args.train:
        network = Network(config, config['model'])
        start_episode = network.episodes_trained
        while True:
            train_outcome, diff_in_values = network.train_model(episodes = episode_count, trained_eps = start_episode)
            start_episode += episode_count
            log_train_outcome(train_outcome, diff_in_values, trained_eps = start_episode)
            if config['eval_after_train']:
                eval_outcomes = network.eval(trained_eps = start_episode)
                log_eval_outcomes(eval_outcomes, trained_eps = start_episode)
            if not config['train_perpetually']:
                break

    elif args.play:
        network = Network(config, config['model'])
        network.play_against_network()

    elif args.eval:
        network = Network(config, config['model'])
        for i in range(int(config['repeat_eval'])):
            start_episode = network.episodes_trained
            # Evaluation measures are described in `config`
            outcomes = network.eval(config['episode_count'])
            log_eval_outcomes(outcomes, trained_eps = start_episode)
            # elif args.play:
            # g.play(episodes = episode_count)

        
    elif args.bench_eval_scores:
        # Make sure benchmark directory exists
        if not os.path.isdir(config['bench_storage_path']):
            os.mkdir(config['bench_storage_path'])

        config = config.copy()
        config['model'] = 'bench'
        
        network = Network(config, config['model'])
        start_episode = network.episodes_trained

        if start_episode == 0:
            print("Model not trained! Beware of using non-existing models!")
            exit()
        
        sample_count = 20
        episode_counts = [25, 50, 100, 250, 500, 1000, 2500, 5000,
                          10000, 20000]

        def do_eval():
            for eval_method in config['eval_methods']:
                result_path = os.path.join(config['bench_storage_path'],
                                           eval_method) + "-{}.log".format(int(time.time()))
                for n in episode_counts:
                    for i in range(sample_count):
                        start_time = time.time()
                        # Evaluation measure to be benchmarked are described in `config`
                        outcomes = network.eval(episode_count = n)
                        time_diff = time.time() - start_time
                        log_bench_eval_outcomes(outcomes,
                                                time = time_diff,
                                                index = i,
                                                trained_eps = start_episode,
                                                log_path = result_path)

        # CMM: oh no
        import tensorflow as tf

        network.restore_model()
        do_eval()