unit1-last part, need to add imports , and gymnasyum version downgrade

[antonagafonov]

need to add
!pip install gymnasium==0.29.1 pickle5
from stable_baselines3 import PPO

before loading the model from hugging face :

from huggingface_sb3 import load_from_hub
from stable_baselines3 import PPO
repo_id = "ToonAga/ppo-LunarLander-v2" # 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)