message: Test the timer in InMemoryEvaluatorHook
  This failing test demonstrates a bug that all iterations are running
diff: @@ -102,6 +102,7 @@ class InMemoryEvaluatorHookTest(test.TestCase):
  self.assertTrue(os.path.isdir(estimator.eval_dir()))
  step_keyword_to_value = summary_step_keyword_to_value_mapping(
  estimator.eval_dir())
  +
  # 4.5 = sum(range(10))/10
  # before training
  self.assertEqual(4.5, step_keyword_to_value[0]['mean_of_features'])
  @@ -110,6 +111,7 @@ class InMemoryEvaluatorHookTest(test.TestCase):
  self.assertEqual(4.5, step_keyword_to_value[8]['mean_of_features'])
  # end
  self.assertEqual(4.5, step_keyword_to_value[10]['mean_of_features'])
  + self.assertEqual([0, 4, 8, 10], list(step_keyword_to_value.keys()))
  def test_uses_latest_variable_value(self):
  