code: def __enter__(self):
      self.start = time.time()
      return self
  
file_path: dgl/examples/pytorch/hilander/utils/misc.py
imports: import json
  import os
  import pickle
  import random
  import time
  import numpy
label_desc: Use image node_id 2 for calling the Timer obj's underlying member method code with example usage: obj.__enter__() and returns: self