message: turn rtol to 0.002 on densenet121, since AMD and Nvidia GPU's precion difference
diff: @@ -47,7 +47,7 @@ def collect_testcases(): # type: () -> List[TestCase]
  model_tests = [
  ('test_bvlc_alexnet', 'bvlc_alexnet', 1e-3, 1e-7),
  - ('test_densenet121', 'densenet121', 1e-3, 1e-7),
  + ('test_densenet121', 'densenet121', 2e-3, 1e-7),
  ('test_inception_v1', 'inception_v1', 1e-3, 1e-7),
  ('test_inception_v2', 'inception_v2', 1e-3, 1e-7),
  ('test_resnet50', 'resnet50', 1e-3, 1e-7),
  