AttributeError in train() while running the tutorial .ipynb

[marcoboresta]

I encountered an issue while running the train() function in the tutorial .ipynb file. The error occurs because the wandb attribute in the SAC class is not initialized before being accessed in the learn() function.

Steps to Reproduce:

1. Clone the repository.
2. Install all dependencies from requirements.txt.
3. Open the provided tutorial .ipynb file.
4. Execute the following cell in the notebook:

from train import train
config = {
"simulator.name": "macro",
"model.name": "sac",
"simulator.city": "nyc_brooklyn",
"model.cplexpath": None,
"model.checkpoint_path": "SAC_custom",
"model.max_episodes": 5,
}
train(config)

5. Observe the following error:
   AttributeError: 'SAC' object has no attribute 'wandb'

Suggested Fix:

Add self.wandb = None to the init method of the SAC class in src/algos/sac.py to ensure the attribute is initialized.

Thank you for the repository and the tutorial!