def __init__(self, obj, seed):
        """
        Accept one more argument for creating the input space
        Args:
            obj: BaseObject
            seed: random seed. It is usually filled automatically.
        """
        super(ExtraEnvInputPolicy, self).__init__(obj, seed)
        self.extra_input = None

        Accept one more argument for creating the input space
        Args:
            obj: BaseObject
            seed: random seed. It is usually filled automatically.
        
metadrive/policy/env_input_policy.py