class_docstr: Helper class to time operations in pipeline e2e tests.
code: def __enter__(self):
      self._start = time.time()
  
file_path: tfx/tfx/orchestration/test_utils.py
imports: import contextlib
  import os
  import random
  import string
  import subprocess
  import time
  from absl import logging
  import docker
label_desc: Use image node_id 2 for calling the Timer obj's underlying member method code with example usage: obj.__enter__() without return types