text: import torch
  import unittest
  
  from torchaudio_unittest.common_utils import PytorchTestCase, skipIfNoCuda, skipIfRocm
  from .functional_impl import Functional
  
  
  @skipIfNoCuda
  class TestFunctionalFloat32(Functional, PytorchTestCase):
      dtype = torch.float32
      device = torch.device('cuda')
  
      @unittest.expectedFailure
      @skipIfRocm
      def test_lfilter_9th_order_filter_stability(self):
          super().test_lfilter_9th_order_filter_stability()
  
  
  @skipIfNoCuda
  @skipIfRocm
  class TestLFilterFloat64(Functional, PytorchTestCase):
      dtype = torch.float64
      device = torch.device('cuda')
  