Minor model card update

README.md

@@ -30,8 +30,24 @@ TODO: Add your code
 
 
 ```python
-from stable_baselines3 import ...
+from stable_baselines3 import PPO
 from huggingface_sb3 import load_from_hub
 
-...
+
+repo_id = "Classroom-workshop/assignment2-omar" # The repo_id
+filename = "ppo-LunarLander-v2.zip" # The model filename.zip
+
+# When the model was trained on Python 3.8 the pickle protocol is 5
+# But Python 3.6, 3.7 use protocol 4
+# In order to get compatibility we need to:
+# 1. Install pickle5 (we done it at the beginning of the colab)
+# 2. Create a custom empty object we pass as parameter to PPO.load()
+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)
 ```