Update README.md

README.md

@@ -29,22 +29,24 @@ using the [stable-baselines3 library](https://github.com/DLR-RM/stable-baselines
 
 
 ```python
+# pip install shimmy
 import gymnasium as gym
 
 from huggingface_sb3 import load_from_hub
 
 from stable_baselines3 import PPO
-from stable_baselines3.common.env_util import make_vec_env
 from stable_baselines3.common.evaluation import evaluate_policy
 from stable_baselines3.common.monitor import Monitor
 
 repo_id = "AdanLee/ppo-LunarLander-v2"
 filename = "ppo-LunarLander-v2.zip"
 
-checkpoint = load_from_hub(repo_id, filename)
-model = PPO.load(checkpoint, print_system_info=True)
+custom_objects = {
+    "learning_rate": 0.0,
+    "lr_schedule": lambda _: 0.0,
+    "clip_range": lambda _: 0.0,
+}
 
-eval_env = Monitor(gym.make("LunarLander-v2"))
-mean_reward, std_reward = evaluate_policy(model, eval_env, n_eval_episodes=10, deterministic=True)
-print(f"mean_reward={mean_reward:.2f} +/- {std_reward}")
+checkpoint = load_from_hub(repo_id, filename)
+model = PPO.load(checkpoint, custom_objects=custom_objects, print_system_info=True)
 ```