code: def _tf_device(device_option):
      if not device_option.HasField("device_type"):
          return ""
      if device_option.device_type == caffe2_pb2.CPU:
          return "/cpu:*"
      if device_option.device_type == caffe2_pb2.CUDA:
          return "/gpu:{}".format(device_option.device_id)
      raise Exception("Unhandled device", device_option)
  
imports: import copy
  import logging
  import os
  from caffe2.proto import caffe2_pb2
  from caffe2.python import core, workspace
label_desc: Use image node_id 9 for calling a global function with example usage: _tf_device(device_option) and returns: str, str, str