import tensorflow as tf from cup import Cup import numpy as np from board import Board import os import time import sys import random from eval import Eval class Network: hidden_size = 40 input_size = 26 output_size = 1 # Can't remember the best learning_rate, look this up learning_rate = 0.01 # TODO: Actually compile tensorflow properly #os.environ["TF_CPP_MIN_LOG_LEVEL"]="2" def custom_tanh(self, x, name=None): return tf.scalar_mul(tf.constant(2.00), tf.tanh(x, name)) def __init__(self, config, name): self.config = config self.checkpoint_path = os.path.join(config['model_storage_path'], config['model']) self.name = name # Restore trained episode count for model episode_count_path = os.path.join(self.checkpoint_path, "episodes_trained") if os.path.isfile(episode_count_path): with open(episode_count_path, 'r') as f: self.episodes_trained = int(f.read()) else: self.episodes_trained = 0 # input = x self.x = tf.placeholder('float', [1, Network.input_size], name='input') self.value_next = tf.placeholder('float', [1, Network.output_size], name="value_next") xavier_init = tf.contrib.layers.xavier_initializer() W_1 = tf.get_variable("w_1", (Network.input_size, Network.hidden_size), initializer=xavier_init) W_2 = tf.get_variable("w_2", (Network.hidden_size, Network.output_size), initializer=xavier_init) b_1 = tf.get_variable("b_1", (Network.hidden_size,), initializer=tf.zeros_initializer) b_2 = tf.get_variable("b_2", (Network.output_size,), initializer=tf.zeros_initializer) normalized_input = tf.nn.l2_normalize(self.x) value_after_input = tf.sigmoid(tf.matmul(normalized_input, W_1) + b_1, name='hidden_layer') self.value = tf.sigmoid(tf.matmul(value_after_input, W_2) + b_2, name='output_layer') # tf.reduce_sum basically finds the sum of its input, so this gives the # difference between the two values, in case they should be lists, which # they might be if our input changes # TODO: Alexander thinks that self.value will be computed twice (instead of once) difference_in_values = tf.reshape(tf.subtract(self.value_next, self.value, name='difference_in_values'), []) tf.summary.scalar("difference_in_values", tf.abs(difference_in_values)) trainable_vars = tf.trainable_variables() gradients = tf.gradients(self.value, trainable_vars) apply_gradients = [] with tf.variable_scope('apply_gradients'): for gradient, trainable_var in zip(gradients, trainable_vars): # Hopefully this is Δw_t = α(V_t+1 - V_t)▿_wV_t. backprop_calc = Network.learning_rate * difference_in_values * gradient grad_apply = trainable_var.assign_add(backprop_calc) apply_gradients.append(grad_apply) self.training_op = tf.group(*apply_gradients, name='training_op') self.saver = tf.train.Saver(max_to_keep=1) def eval_state(self, sess, state): # Run state through a network # Remember to create placeholders for everything because wtf tensorflow # and graphs # Remember to create the dense layers # Figure out a way of giving a layer a custom activiation function (we # want something which gives [-2,2]. Naively tahn*2, however I fell this # is wrong. # tf.group, groups a bunch of actions, so calculate the different # gradients for the different weights, by using tf.trainable_variables() # to find all variables and tf.gradients(current_value, # trainable_variables) to find all the gradients. We can then loop # through this and calculate the trace for each gradient and variable # pair (note, zip can be used to combine the two lists found before), # and then we can calculate the overall change in weights, based on the # formula listed in tesauro (learning_rate * difference_in_values * # trace), this calculation can be assigned to a tf variable and put in a # list and then this can be grouped into a single operation, essentially # building our own backprop function. # Grouping them is done by # tf.group(*the_gradients_from_before_we_want_to_apply, # name="training_op") # If we remove the eligibily trace to begin with, we only have to # implement learning_rate * (difference_in_values) * gradients (the # before-mentioned calculation. # print("Network is evaluating") #print("eval ({})".format(self.name), state, val, sep="\n") return sess.run(self.value, feed_dict={self.x: state}) def save_model(self, sess, episode_count): self.saver.save(sess, os.path.join(self.checkpoint_path, 'model.ckpt')) with open(os.path.join(self.checkpoint_path, "episodes_trained"), 'w+') as f: print("[NETWK] ({name}) Saving model to:".format(name = self.name), os.path.join(self.checkpoint_path, 'model.ckpt')) f.write(str(episode_count) + "\n") def restore_model(self, sess): if os.path.isfile(os.path.join(self.checkpoint_path, 'model.ckpt.index')): latest_checkpoint = tf.train.latest_checkpoint(self.checkpoint_path) print("[NETWK] ({name}) Restoring model from:".format(name = self.name), str(latest_checkpoint)) self.saver.restore(sess, latest_checkpoint) variables_names = [v.name for v in tf.trainable_variables()] values = sess.run(variables_names) for k, v in zip(variables_names, values): print("Variable: ", k) print("Shape: ", v.shape) print(v) # Restore trained episode count for model episode_count_path = os.path.join(self.checkpoint_path, "episodes_trained") if os.path.isfile(episode_count_path): with open(episode_count_path, 'r') as f: self.config['start_episode'] = int(f.read()) def make_move(self, sess, board, roll): # print(Board.pretty(board)) legal_moves = Board.calculate_legal_states(board, 1, roll) moves_and_scores = [ (move, self.eval_state(sess, np.array(move).reshape(1,26))) for move in legal_moves ] scores = [ x[1] for x in moves_and_scores ] best_score_index = np.array(scores).argmax() best_move_pair = moves_and_scores[best_score_index] #print("Found the best state, being:", np.array(move_scores).argmax()) return best_move_pair def train_model(self, episodes=1000, save_step_size = 100, trained_eps = 0): with tf.Session() as sess: writer = tf.summary.FileWriter("/tmp/log/tf", sess.graph) sess.run(tf.global_variables_initializer()) self.restore_model(sess) variables_names = [v.name for v in tf.trainable_variables()] values = sess.run(variables_names) for k, v in zip(variables_names, values): print("Variable: ", k) print("Shape: ", v.shape) print(v) start_time = time.time() def print_time_estimate(eps_completed): cur_time = time.time() time_diff = cur_time - start_time eps_per_sec = eps_completed / time_diff secs_per_ep = time_diff / eps_completed eps_remaining = (episodes - eps_completed) sys.stderr.write("[TRAIN] Averaging {per_sec} episodes per second\n".format(per_sec = round(eps_per_sec, 2))) sys.stderr.write("[TRAIN] {eps_remaining} episodes remaining; approx. {time_remaining} seconds remaining\n".format(eps_remaining = eps_remaining, time_remaining = int(eps_remaining * secs_per_ep))) sys.stderr.write("[TRAIN] Training {} episodes and save_step_size {}\n".format(episodes, save_step_size)) outcomes = [] for episode in range(1, episodes + 1): sys.stderr.write("[TRAIN] Episode {}".format(episode + trained_eps)) # TODO decide which player should be here player = 1 roll = (random.randrange(1,7), random.randrange(1,7)) prev_board, _ = self.make_move(sess, Board.flip(Board.initial_state) if player == -1 else Board.initial_state, roll) if player == -1: prev_board = Board.flip(prev_board) # find the best move here, make this move, then change turn as the # first thing inside of the while loop and then call # best_move_and_score to get V_t+1 # i = 0 while Board.outcome(prev_board) is None: # print("-"*30) # print(i) # print(roll) # print(Board.pretty(prev_board)) # print("/"*30) # i += 1 player *= -1 roll = (random.randrange(1,7), random.randrange(1,7)) cur_board, cur_board_value = self.make_move(sess, Board.flip(prev_board) if player == -1 else prev_board, roll) if player == -1: cur_board = Board.flip(cur_board) # print("cur_board_value:", cur_board_value) # adjust weights sess.run(self.training_op, feed_dict = { self.x: np.array(prev_board).reshape((1,26)), self.value_next: cur_board_value }) prev_board = cur_board final_board = prev_board sys.stderr.write("\t outcome {}".format(Board.outcome(final_board)[1])) outcomes.append(Board.outcome(final_board)[1]) final_score = np.array([ Board.outcome(final_board)[1] ]) scaled_final_score = ((final_score + 2) / 4) # print("scaled_final_score",scaled_final_score) with tf.name_scope("final"): merged = tf.summary.merge_all() summary, _ = sess.run([merged, self.training_op], feed_dict = { self.x: np.array(prev_board).reshape((1,26)), self.value_next: scaled_final_score.reshape((1, 1)) }) writer.add_summary(summary, episode + trained_eps) sys.stderr.write("\n") if episode % min(save_step_size, episodes) == 0: sys.stderr.write("[TRAIN] Saving model...\n") self.save_model(sess, episode+trained_eps) if episode % 50 == 0: print_time_estimate(episode) sys.stderr.write("[TRAIN] Saving model for final episode...\n") self.save_model(sess, episode+trained_eps) writer.close() return outcomes # take turn, which finds the best state and picks it, based on the current network # save current state # run training operation (session.run(self.training_op, {x:x, value_next, value_next})), (something which does the backprop, based on the state after having taken a turn, found before, and the state we saved in the beginning and from now we'll save it at the end of the turn # save the current state again, so we can continue running backprop based on the "previous" turn. # NOTE: We need to make a method so that we can take a single turn or at least just pick the next best move, so we know how to evaluate according to TD-learning. Right now, our game just continues in a while loop without nothing to stop it! def eval(self, episode_count, trained_eps = 0, tf_session = None): def do_eval(sess, method, episodes = 1000, trained_eps = 0): start_time = time.time() def print_time_estimate(eps_completed): cur_time = time.time() time_diff = cur_time - start_time eps_per_sec = eps_completed / time_diff secs_per_ep = time_diff / eps_completed eps_remaining = (episodes - eps_completed) sys.stderr.write("[EVAL ] Averaging {per_sec} episodes per second\n".format(per_sec = round(eps_per_sec, 2))) sys.stderr.write("[EVAL ] {eps_remaining} episodes remaining; approx. {time_remaining} seconds remaining\n".format(eps_remaining = eps_remaining, time_remaining = int(eps_remaining * secs_per_ep))) sys.stderr.write("[EVAL ] Evaluating {eps} episode(s) with method '{method}'\n".format(eps=episodes, method=method)) if method == 'random': outcomes = [] for i in range(1, episodes + 1): sys.stderr.write("[EVAL ] Episode {}".format(i)) board = Board.initial_state while Board.outcome(board) is None: roll = (random.randrange(1,7), random.randrange(1,7)) board = (self.p1.make_move(sess, board, self.p1.get_sym(), roll))[0] roll = (random.randrange(1,7), random.randrange(1,7)) board = Board.flip(Eval.make_random_move(Board.flip(board), 1, roll)) sys.stderr.write("\t outcome {}".format(Board.outcome(board)[1])) outcomes.append(Board.outcome(board)[1]) sys.stderr.write("\n") if i % 50 == 0: print_time_estimate(i) return outcomes elif method == 'pubeval': outcomes = [] # Add the evaluation code for pubeval, the bot has a method make_pubeval_move(board, sym, roll), which can be used to get the best move according to pubeval for i in range(1, episodes + 1): sys.stderr.write("[EVAL ] Episode {}".format(i)) board = Board.initial_state #print("init:", board, sep="\n") while Board.outcome(board) is None: #print("-"*30) roll = (random.randrange(1,7), random.randrange(1,7)) #print(roll) prev_board = tuple(board) board = (self.make_move(sess, board, roll))[0] #print("post p1:", board, sep="\n") #print("."*30) roll = (random.randrange(1,7), random.randrange(1,7)) #print(roll) prev_board = tuple(board) board = Eval.make_pubeval_move(board, -1, roll)[0][0:26] #print("post pubeval:", board, sep="\n") #print("*"*30) #print(board) #print("+"*30) sys.stderr.write("\t outcome {}".format(Board.outcome(board)[1])) outcomes.append(Board.outcome(board)[1]) sys.stderr.write("\n") if i % 10 == 0: print_time_estimate(i) return outcomes # elif method == 'dumbmodel': # config_prime = self.config.copy() # config_prime['model_path'] = os.path.join(config_prime['model_storage_path'], 'dumbmodel') # eval_bot = Bot(1, config = config_prime, name = "dumbmodel") # #print(self.config, "\n", config_prime) # outcomes = [] # for i in range(1, episodes + 1): # sys.stderr.write("[EVAL ] Episode {}".format(i)) # board = Board.initial_state # while Board.outcome(board) is None: # roll = (random.randrange(1,7), random.randrange(1,7)) # board = (self.make_move(board, self.p1.get_sym(), roll))[0] # roll = (random.randrange(1,7), random.randrange(1,7)) # board = Board.flip(eval_bot.make_move(Board.flip(board), self.p1.get_sym(), roll)[0]) # sys.stderr.write("\t outcome {}".format(Board.outcome(board)[1])) # outcomes.append(Board.outcome(board)[1]) # sys.stderr.write("\n") # if i % 50 == 0: # print_time_estimate(i) # return outcomes else: sys.stderr.write("[EVAL ] Evaluation method '{}' is not defined\n".format(method)) return [0] if tf_session == None: with tf.Session(): session.run(tf.global_variables_initializer()) self.restore_model(session) outcomes = [ (method, do_eval(session, method, episode_count, trained_eps = trained_eps)) for method in self.config['eval_methods'] ] return outcomes else: outcomes = [ (method, do_eval(tf_session, method, episode_count, trained_eps = trained_eps)) for method in self.config['eval_methods'] ] return outcomes