code: def __str__(self):
      return (
          "Host:\n" + str(self.host) + "\nDevice:\n" + str(self.device)
      )
  
imports: import argparse
  import os
  import time
  import numpy
  import paddle
  import tensorrt
  import pycuda.driver
  import pycuda.autoinit
  import onnx
  import onnxruntime
  from paddleseg.cvlibs import Config, SegBuilder
  from paddleseg.utils import logger, utils
label_desc: Use image node_id 2 for calling the HostDeviceMem obj's underlying member method code with example usage: obj.__str__() and returns: unknown