code: def _get_device_id(self, places):
      try:
          places = os.environ[places]
          id = int(places)
      except:
          id = -1
      return id
  
imports: from __future__ import absolute_import
  import argparse
  import ast
  import os
  from functools import partial
  import numpy
  import paddle
  import paddle.jit
  import paddle.static
  from paddle.inference import Config
  from paddle.inference import create_predictor
  from .data_feed import reader
  from .processor import base64_to_cv2
  from .processor import load_label_info
  from .processor import postprocess
  from paddlehub.module.module import moduleinfo
  from paddlehub.module.module import runnable
  from paddlehub.module.module import serving
label_desc: Use image node_id 2 for calling the YOLOv3DarkNet53Vehicles obj's underlying member method code with example usage: obj._get_device_id(places) and returns: id