code: def setUp(self):
      self.trainer = testing.get_trainer_with_mock_updater(
          self.stop_trigger,
          self.iter_per_epoch,
          extensions=self.extensions,
      )
  
file_path: chainer/tests/chainer_tests/testing_tests/test_training.py
imports: from __future__ import division
  import math
  import unittest
  from chainer import testing
label_desc: Use image node_id 1 for calling the TestGetTrainerWithMockUpdater obj's underlying member method code with example usage: obj.setUp() without return types