code: def get_available_gpus(config):
      r"""
      Returns the number of GPUs available on this system.
      """
      local_device_protos = device_lib.list_local_devices(
          session_config=config
      )
      return [
          x.name for x in local_device_protos if x.device_type == "GPU"
      ]
  
label_desc: Use image node_id 1 for calling a global function with example usage: get_available_gpus(config) and returns: unknown