code: def setUp(self):
      self.trainer = self._create_mock_trainer(10)
      self.trainer.is_initialized = False
  
imports: import time
  import traceback
  import unittest
  from chainer import testing
  from chainer import training
label_desc: Use image node_id 1 for calling the TestTrainer obj's underlying member method code with example usage: obj.setUp() without return types