code: def __init__(self):
      self.elapsed_time = 0
  
file_path: chainer/tests/chainer_tests/training_tests/triggers_tests/test_time_trigger.py
imports: import io
  import unittest
  import chainer
  from chainer import testing
label_desc: Use image node_id 1 to create a new DummyTrainer object from inherited base classes: object with example: obj = DummyTrainer()