code: def __init__(self):
      self.a = variables.Variable(0)
      self.b = variables.Variable(1)
  
file_path: tensorflow-upstream/tensorflow/python/saved_model/tracing_utils_test.py
imports: from tensorflow.python.eager import def_function
  from tensorflow.python.eager import test
  from tensorflow.python.framework import constant_op
  from tensorflow.python.ops import control_flow_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.saved_model import tracing_utils
  from tensorflow.python.trackable import base
label_desc: Use image node_id 1 to create a new MyTrackable object from inherited base classes: base with example: obj = MyTrackable()