code: def register_backend_driver(scheme: str, cls: Type[BaseActorDriver]):
      assert issubclass(cls, BaseActorDriver)
      _backend_driver_cls[scheme] = cls
  
imports: from abc import ABC, abstractmethod
  from numbers import Number
  from typing import Dict, Type
label_desc: Use image node_id 1 for calling a global function with example usage: register_backend_driver(scheme, cls) without return types