code: def main():
      FLAGS = parse_args()
      cfg = load_config(FLAGS.config)
      merge_config(FLAGS.opt)
  
      # disable npu in config by default
      if "use_npu" not in cfg:
          cfg.use_npu = False
  
      # disable xpu in config by default
      if "use_xpu" not in cfg:
          cfg.use_xpu = False
  
      if "use_gpu" not in cfg:
          cfg.use_gpu = False
  
      # disable mlu in config by default
      if "use_mlu" not in cfg:
          cfg.use_mlu = False
  
      if cfg.use_gpu:
          place = paddle.set_device("gpu")
      elif cfg.use_npu:
          place = paddle.set_device("npu")
      elif cfg.use_xpu:
          place = paddle.set_device("xpu")
      elif cfg.use_mlu:
          place = paddle.set_device("mlu")
      else:
          place = paddle.set_device("cpu")
  
      check_config(cfg)
      check_gpu(cfg.use_gpu)
      check_npu(cfg.use_npu)
      check_xpu(cfg.use_xpu)
      check_mlu(cfg.use_mlu)
      check_version()
  
      run(FLAGS, cfg)
  
file_path: PaddleDetection/tools/infer_mot.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import sys
  import warnings
  import paddle
  from ppdet.core.workspace import load_config, merge_config
  from ppdet.engine import Tracker
  from ppdet.utils.check import check_gpu, check_npu, check_xpu, check_mlu, check_version, check_config
  from ppdet.utils.cli import ArgsParser
label_desc: Use image node_id 3 for calling a global function with example usage: main() without return types