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1import gymnasium as gym
2from pyvirtualdisplay import Display
3from huggingface_sb3 import load_from_hub, package_to_hub
4from huggingface_hub import notebook_login # To log to our Hugging Face account to be able to upload models to the Hub.
5from stable_baselines3 import PPO
6from stable_baselines3.common.env_util import make_vec_env
7from stable_baselines3.common.evaluation import evaluate_policy
8from stable_baselines3.common.monitor import Monitor
9
10virtual_display = Display(visible=0, size=(1400, 900))
11virtual_display.start()
12
13env = gym.make("LunarLander-v2")
14
15observation, info = env.reset()
16
17for _ in range(20):
18 action = env.action_space.sample()
19 print("Action taken:", action)
20
21 observation, reward, terminated, truncated, info = env.step(action)
22
23 if terminated or truncated:
24 # Reset the environment
25 print("Environment is reset")
26 observation, info = env.reset()
27
28
29env.reset()
30
31print("_____OBSERVATION SPACE_____ \n")
32print("Observation Space Shape", env.observation_space.shape)
33print("Sample observation", env.observation_space.sample())
34
35print("\n _____ACTION SPACE_____ \n")
36print("Action Space Shape", env.action_space.n)
37print("Action Space Sample", env.action_space.sample()) # Take a random action
38
39env = make_vec_env('LunarLander-v2', n_envs=16)
40
41model = PPO(policy = 'MlpPolicy', env = env, n_steps = 1024, batch_size = 64, n_epochs = 4, gamma = 0.999, gae_lambda = 0.98, ent_coef = 0.01, verbose=1)
42
43
44model.learn(total_timesteps=1000000)
45
46model_name = "ppo-LunarLander-v2"
47model.save(model_name)
48
49eval_env = Monitor(gym.make("LunarLander-v2", render_mode='rgb_array'))
50mean_reward, std_reward = evaluate_policy(model, eval_env, n_eval_episodes=10, deterministic=True)
51print(f"mean_reward={mean_reward:.2f} +/- {std_reward}")
52...