code: def test_report_late_register(self):
      extension = self.create_extension(skip_statistics=True)
      for name, function in six.iteritems(self.statistics):
          extension.register_statistics(name, function)
      self.trainer.extend(extension)
      self.trainer.run()
      self.assertEqual(len(self.trainer.observation), self.expect)
  
imports: import re
  import time
  import unittest
  import mock
  import six
  import chainer
  from chainer import backend
  from chainer import testing
  from chainer import training
  from chainer.training import extensions
label_desc: Use image node_id 2 for calling the TestParameterStatistics obj's underlying member method code with example usage: obj.test_report_late_register() without return types