code: def __enter__(self, timer=timeit.default_timer):
      self.start = timer()
      return self
  
imports: import functools
  import math
  import numbers
  import random
  import sys
  import timeit
  import warnings
  from collections import defaultdict
  from contextlib import contextmanager
  from itertools import zip_longest
  import numpy
  import torch
  from pyro.poutine.util import site_is_subsample
label_desc: Use image node_id 1 for calling the timed obj's underlying member method code with example usage: obj.__enter__(timer) and returns: self