openai-tests/ql/train.py

from . import *

def train(training_episodes=10000, resume=True):
    global frames
    frames = []

    if resume and os.path.exists(gym_name+".dat"):
        q_table = pickle.load( open( gym_name+".dat", "rb" ))
    else:
        q_table = np.zeros([env.observation_space.n, env.action_space.n])

    episodes = training_episodes
    percentage = episodes / 100

    suc_cnt = 0

    try:
        print (u"{}[2J{}[;H".format(chr(27), chr(27)))
        print("Training: 0%")
        print("Successes so far: 0")
        for i in range(1, episodes + 1):
            state = env.reset()

            epochs, reward, = 0, 0
            done = False
            
            while not done:
                if random.uniform(0, 1) < epsilon:
                    action = env.action_space.sample()
                else:
                    action = np.argmax(q_table[state])

                next_state, reward, done, info = env.step(action) 
                
                old_value = q_table[state, action]
                next_max = np.max(q_table[next_state])
                
                new_value = (1 - alpha) * old_value + alpha * (reward + gamma * next_max)
                q_table[state, action] = new_value

                if reward > 0:
                    suc_cnt += 1

                state = next_state
                epochs += 1

                if i % percentage == 0:
                    ftext = ""
                    if use_video:
                        env.render(mode="ansi")
                    if use_ansi:
                        ftext = env.render(mode="ansi")
                    else:
                        ftext = str(info)

                    frames.append({
                        'frame': ftext,
                        'state': state,
                        'action': action,
                        'reward': reward,
                        'session': i
                        }
                    )
                
            if i % percentage == 0:
                print (u"{}[2J{}[;H".format(chr(27), chr(27)))
                print(f"Training: {i/percentage}%")
                print(f"Successes so far: {suc_cnt}")
                sleep(.1)
        print (u"{}[2J{}[;H".format(chr(27), chr(27)))
        print("Training: finished.\n")
        print(f"Successes totally: {suc_cnt}")
        pickle.dump(q_table , open( gym_name+".dat", "wb" ) )
        print(f"Q-table saved: {gym_name}.dat")

    except KeyboardInterrupt:
        print (u"{}[2J{}[;H".format(chr(27), chr(27)))
        print("Training: stopped.\n")
        print(f"Successes totally: {suc_cnt}")
        pickle.dump(q_table , open( gym_name+".dat", "wb" ) )
        print(f"Q-table saved: {gym_name}_stopped.dat")
        exit()