code: def __init__(self, with_tracker=False):
      super(Timer, self).__init__()
      self.with_tracker = with_tracker
      self.preprocess_time_s = Times()
      self.inference_time_s = Times()
      self.postprocess_time_s = Times()
      self.tracking_time_s = Times()
      self.img_num = 0
  
imports: import time
  import os
  import ast
  import argparse
  import numpy
label_desc: Use image node_id 1 to create a new Timer object from inherited base classes: Times with example: obj = Timer(with_tracker)