Update README.md

README.md

@@ -30,8 +30,34 @@ TODO: Add your code
 
 
 ```python
-from stable_baselines3 import ...
+import gymnasium as gym
+from stable_baselines3 import PPO
 from huggingface_sb3 import load_from_hub
+from stable_baselines3.common.monitor import Monitor
+from stable_baselines3.common.evaluation import evaluate_policy
 
+repo_id = "Cesoft/ppo-LunarLander-v2"
+filename = "ppo-LunarLander-v2.zip"
+
+custom_objects = {
+    "learning_rate": 0.0,
+    "lr_schedule": lambda _: 0.0,
+    "clip_range": lambda _: 0.0,
+}
+
+checkpoint = load_from_hub(repo_id, filename)
+model = PPO.load(checkpoint, custom_objects=custom_objects, print_system_info=True)
+
+eval_env = Monitor(gym.make("LunarLander-v2", render_mode="human"))
+    
+mean_reward, std_reward = evaluate_policy(
+    model,
+    eval_env,
+    n_eval_episodes=EVAL_EPISODES,
+    deterministic=True,
+    render=True
+)
+eval_env.close()
+print(f"mean_reward={mean_reward:.2f} +/- {std_reward} = {mean_reward - std_reward}")
 ...
 ```