code: def __enter__(self):
      # print("ON trace", sys._getframe())
      self.tracer = ExplainTensorTracer(self)
      sys.settrace(self.tracer.listener)
      frame = sys._getframe()
      prev = frame.f_back  # get block wrapped in "with"
      prev.f_trace = self.tracer.listener
      return self.tracer
  
imports: import os
  import sys
  import traceback
  import inspect
  import hashlib
  from pathlib import Path
  import matplotlib.pyplot
  import tsensor
label_desc: Use image node_id 2 for calling the explain obj's underlying member method code with example usage: obj.__enter__() and returns: self