376 lines
16 KiB
Python
376 lines
16 KiB
Python
import tensorflow as tf
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from cup import Cup
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import numpy as np
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from board import Board
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import os
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import time
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import sys
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import random
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from eval import Eval
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import glob
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from operator import itemgetter
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class Network:
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# board_features_quack has size 28
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# board_features_quack_fat has size 30
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# board_features_tesauro has size 198
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board_reps = {
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'quack-fat' : (30, Board.board_features_quack_fat),
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'quack' : (28, Board.board_features_quack),
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'tesauro' : (198, Board.board_features_tesauro)
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}
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def custom_tanh(self, x, name=None):
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return tf.scalar_mul(tf.constant(2.00), tf.tanh(x, name))
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def __init__(self, config, name):
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self.config = config
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self.checkpoint_path = os.path.join(config['model_storage_path'], config['model'])
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self.name = name
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# Set board representation from config
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self.input_size, self.board_trans_func = Network.board_reps[
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self.config['board_representation']
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]
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self.output_size = 1
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self.hidden_size = 40
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self.max_learning_rate = 0.1
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self.min_learning_rate = 0.001
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self.global_step = tf.Variable(0, trainable=False, name="global_step")
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self.learning_rate = tf.maximum(self.min_learning_rate,
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tf.train.exponential_decay(self.max_learning_rate,
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self.global_step, 50000,
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0.96,
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staircase=True),
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name="learning_rate")
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# Restore trained episode count for model
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episode_count_path = os.path.join(self.checkpoint_path, "episodes_trained")
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if os.path.isfile(episode_count_path):
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with open(episode_count_path, 'r') as f:
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self.episodes_trained = int(f.read())
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else:
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self.episodes_trained = 0
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self.x = tf.placeholder('float', [1, self.input_size], name='input')
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self.value_next = tf.placeholder('float', [1, self.output_size], name="value_next")
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xavier_init = tf.contrib.layers.xavier_initializer()
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W_1 = tf.get_variable("w_1", (self.input_size, self.hidden_size),
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initializer=xavier_init)
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W_2 = tf.get_variable("w_2", (self.hidden_size, self.output_size),
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initializer=xavier_init)
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b_1 = tf.get_variable("b_1", (self.hidden_size,),
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initializer=tf.zeros_initializer)
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b_2 = tf.get_variable("b_2", (self.output_size,),
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initializer=tf.zeros_initializer)
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value_after_input = tf.sigmoid(tf.matmul(self.x, W_1) + b_1, name='hidden_layer')
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self.value = tf.sigmoid(tf.matmul(value_after_input, W_2) + b_2, name='output_layer')
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# tf.reduce_sum basically finds the sum of its input, so this gives the
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# difference between the two values, in case they should be lists, which
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# they might be if our input changes
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# TODO: Alexander thinks that self.value will be computed twice (instead of once)
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difference_in_values = tf.reshape(tf.subtract(self.value_next, self.value, name='difference_in_values'), [])
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tf.summary.scalar("difference_in_values", tf.abs(difference_in_values))
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trainable_vars = tf.trainable_variables()
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gradients = tf.gradients(self.value, trainable_vars)
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apply_gradients = []
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global_step_op = self.global_step.assign_add(1)
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with tf.variable_scope('apply_gradients'):
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for gradient, trainable_var in zip(gradients, trainable_vars):
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# Hopefully this is Δw_t = α(V_t+1 - V_t)▿_wV_t.
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backprop_calc = self.learning_rate * difference_in_values * gradient
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grad_apply = trainable_var.assign_add(backprop_calc)
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apply_gradients.append(grad_apply)
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with tf.control_dependencies([global_step_op]):
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self.training_op = tf.group(*apply_gradients, name='training_op')
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self.saver = tf.train.Saver(max_to_keep=1)
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def eval_state(self, sess, state):
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return sess.run(self.value, feed_dict={self.x: state})
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def save_model(self, sess, episode_count, global_step):
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self.saver.save(sess, os.path.join(self.checkpoint_path, 'model.ckpt'), global_step=global_step)
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with open(os.path.join(self.checkpoint_path, "episodes_trained"), 'w+') as f:
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print("[NETWK] ({name}) Saving model to:".format(name=self.name),
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os.path.join(self.checkpoint_path, 'model.ckpt'))
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f.write(str(episode_count) + "\n")
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def restore_model(self, sess):
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if glob.glob(os.path.join(self.checkpoint_path, 'model.ckpt*.index')):
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latest_checkpoint = tf.train.latest_checkpoint(self.checkpoint_path)
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print("[NETWK] ({name}) Restoring model from:".format(name=self.name),
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str(latest_checkpoint))
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self.saver.restore(sess, latest_checkpoint)
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variables_names = [v.name for v in tf.trainable_variables()]
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values = sess.run(variables_names)
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for k, v in zip(variables_names, values):
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print("Variable: ", k)
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print("Shape: ", v.shape)
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print(v)
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# Restore trained episode count for model
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episode_count_path = os.path.join(self.checkpoint_path, "episodes_trained")
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if os.path.isfile(episode_count_path):
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with open(episode_count_path, 'r') as f:
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self.config['start_episode'] = int(f.read())
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def make_move(self, sess, board, roll, player):
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legal_moves = Board.calculate_legal_states(board, player, roll)
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moves_and_scores = [(move, self.eval_state(sess, self.board_trans_func(move, player))) for move in legal_moves]
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scores = [x[1] if np.sign(player) > 0 else 1-x[1] for x in moves_and_scores]
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best_score_index = np.array(scores).argmax()
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best_move_pair = moves_and_scores[best_score_index]
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return best_move_pair
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def gen_21_rolls(self):
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a = []
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for x in range(1,7):
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for y in range(1,7):
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if not [x,y] in a and not [y,x] in a:
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a.append([x,y])
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return a
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def calculate_2_ply(self, sess, board, roll, player):
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"""
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Find the best move based on a 2-ply look-ahead. First the best move is found for a single ply and then an
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exhaustive search is performed on the best 15 moves from the single ply.
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:param sess:
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:param board:
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:param roll: The original roll
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:param player: The current player
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:return: Best possible move based on 2-ply look-ahead
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"""
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init_legal_states = Board.calculate_legal_states(board, player, roll)
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zero_ply_moves_and_scores = [(move, self.eval_state(sess, self.board_trans_func(move, player))) for move in init_legal_states]
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# pythons reverse is in place and I can't call [:15] on it, without applying it to an object like so. Fuck.
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best_fifteen = sorted(zero_ply_moves_and_scores, key=itemgetter(1))
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best_fifteen.reverse()
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best_fifteen_boards = [x[0] for x in best_fifteen[:15]]
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all_rolls = self.gen_21_rolls()
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all_rolls_scores = []
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for a_board in best_fifteen_boards:
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a_board_scores = []
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for roll in all_rolls:
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spec_roll_scores = []
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all_rolls_boards = Board.calculate_legal_states(a_board, player*-1, roll)
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spec_roll_scores.append([self.eval_state(sess, self.board_trans_func(new_board, player*-1)) for new_board in all_rolls_boards])
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best_score = max(spec_roll_scores)
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a_board_scores.append(best_score)
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all_rolls_scores.append(sum(a_board_scores)/len(a_board_scores))
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best_score_index = np.array(all_rolls_scores).argmax()
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best_board = best_fifteen_boards[best_score_index]
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return [best_board, max(all_rolls_scores)]
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def eval(self, episode_count, trained_eps = 0, tf_session = None):
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def do_eval(sess, method, episodes = 1000, trained_eps = 0):
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start_time = time.time()
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def print_time_estimate(eps_completed):
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cur_time = time.time()
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time_diff = cur_time - start_time
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eps_per_sec = eps_completed / time_diff
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secs_per_ep = time_diff / eps_completed
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eps_remaining = (episodes - eps_completed)
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sys.stderr.write(
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"[EVAL ] Averaging {per_sec} episodes per second\n".format(per_sec=round(eps_per_sec, 2)))
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sys.stderr.write(
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"[EVAL ] {eps_remaining} episodes remaining; approx. {time_remaining} seconds remaining\n".format(
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eps_remaining=eps_remaining, time_remaining=int(eps_remaining * secs_per_ep)))
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sys.stderr.write(
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"[EVAL ] Evaluating {eps} episode(s) with method '{method}'\n".format(eps=episodes, method=method))
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if method == 'pubeval':
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outcomes = []
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for i in range(1, episodes + 1):
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sys.stderr.write("[EVAL ] Episode {}".format(i))
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board = Board.initial_state
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while Board.outcome(board) is None:
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roll = (random.randrange(1, 7), random.randrange(1, 7))
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board = (self.make_move(sess, board, roll, 1))[0]
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roll = (random.randrange(1, 7), random.randrange(1, 7))
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board = Eval.make_pubeval_move(board, -1, roll)[0][0:26]
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sys.stderr.write("\t outcome {}".format(Board.outcome(board)[1]))
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outcomes.append(Board.outcome(board)[1])
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sys.stderr.write("\n")
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if i % 10 == 0:
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print_time_estimate(i)
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return outcomes
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elif method == 'dumbeval':
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outcomes = []
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for i in range(1, episodes + 1):
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sys.stderr.write("[EVAL ] Episode {}".format(i))
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board = Board.initial_state
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while Board.outcome(board) is None:
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roll = (random.randrange(1, 7), random.randrange(1, 7))
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board = (self.make_move(sess, board, roll, 1))[0]
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roll = (random.randrange(1, 7), random.randrange(1, 7))
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board = Eval.make_dumbeval_move(board, -1, roll)[0][0:26]
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sys.stderr.write("\t outcome {}".format(Board.outcome(board)[1]))
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outcomes.append(Board.outcome(board)[1])
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sys.stderr.write("\n")
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if i % 10 == 0:
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print_time_estimate(i)
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return outcomes
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else:
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sys.stderr.write("[EVAL ] Evaluation method '{}' is not defined\n".format(method))
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return [0]
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if tf_session == None:
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with tf.Session() as session:
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session.run(tf.global_variables_initializer())
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self.restore_model(session)
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outcomes = [ (method, do_eval(session,
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method,
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episode_count,
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trained_eps = trained_eps))
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for method
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in self.config['eval_methods'] ]
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return outcomes
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else:
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outcomes = [ (method, do_eval(tf_session,
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method,
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episode_count,
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trained_eps = trained_eps))
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for method
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in self.config['eval_methods'] ]
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return outcomes
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def train_model(self, episodes=1000, save_step_size=100, trained_eps=0):
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with tf.Session() as sess:
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writer = tf.summary.FileWriter("/tmp/log/tf", sess.graph)
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sess.run(tf.global_variables_initializer())
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self.restore_model(sess)
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variables_names = [v.name for v in tf.trainable_variables()]
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values = sess.run(variables_names)
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for k, v in zip(variables_names, values):
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print("Variable: ", k)
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print("Shape: ", v.shape)
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print(v)
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start_time = time.time()
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def print_time_estimate(eps_completed):
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cur_time = time.time()
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time_diff = cur_time - start_time
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eps_per_sec = eps_completed / time_diff
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secs_per_ep = time_diff / eps_completed
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eps_remaining = (episodes - eps_completed)
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sys.stderr.write(
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"[TRAIN] Averaging {per_sec} episodes per second\n".format(per_sec=round(eps_per_sec, 2)))
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sys.stderr.write(
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"[TRAIN] {eps_remaining} episodes remaining; approx. {time_remaining} seconds remaining\n".format(
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eps_remaining=eps_remaining, time_remaining=int(eps_remaining * secs_per_ep)))
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sys.stderr.write("[TRAIN] Training {} episodes and save_step_size {}\n".format(episodes, save_step_size))
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outcomes = []
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for episode in range(1, episodes + 1):
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sys.stderr.write("[TRAIN] Episode {}".format(episode + trained_eps))
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# TODO decide which player should be here
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player = 1
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prev_board = Board.initial_state
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i = 0
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while Board.outcome(prev_board) is None:
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i += 1
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cur_board, cur_board_value = self.make_move(sess,
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prev_board,
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(random.randrange(1, 7), random.randrange(1, 7)),
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player)
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# adjust weights
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sess.run(self.training_op,
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feed_dict={self.x: self.board_trans_func(prev_board, player),
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self.value_next: cur_board_value})
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player *= -1
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prev_board = cur_board
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final_board = prev_board
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sys.stderr.write("\t outcome {}\t turns {}".format(Board.outcome(final_board)[1], i))
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outcomes.append(Board.outcome(final_board)[1])
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final_score = np.array([Board.outcome(final_board)[1]])
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scaled_final_score = ((final_score + 2) / 4)
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with tf.name_scope("final"):
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merged = tf.summary.merge_all()
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global_step, summary, _ = sess.run([self.global_step, merged, self.training_op],
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feed_dict={self.x: self.board_trans_func(prev_board, player),
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self.value_next: scaled_final_score.reshape((1, 1))})
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writer.add_summary(summary, episode + trained_eps)
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sys.stderr.write("\n")
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if episode % min(save_step_size, episodes) == 0:
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sys.stderr.write("[TRAIN] Saving model...\n")
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self.save_model(sess, episode + trained_eps, global_step)
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if episode % 50 == 0:
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print_time_estimate(episode)
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sys.stderr.write("[TRAIN] Saving model for final episode...\n")
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self.save_model(sess, episode+trained_eps, global_step)
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writer.close()
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return outcomes |