code: def shutdown(self) -> None:
      ray.shutdown()
  
file_path: BigDL/python/nano/src/bigdl/nano/deps/ray/ray_backend.py
imports: import ray
  from bigdl.nano.utils.common import Backend
  from bigdl.nano.utils.common import invalidInputError
label_desc: Use image node_id 2 for calling the RayBackend obj's underlying member method code with example usage: obj.shutdown() without return types