docstr: Check if LFCC-DCT norm works correctly.
docstr_tok: ["Check","if","LFCC-DCT","norm","works","correctly","."]
code: def test_lfcc_norms(self):
      """Check if LFCC-DCT norm works correctly."""
      sample_rate = 16000
      audio = common_utils.get_whitenoise(sample_rate=sample_rate)
  
      n_lfcc = 40
      n_filter = 128
      lfcc_transform = torchaudio.transforms.LFCC(
          sample_rate=sample_rate,
          n_filter=n_filter,
          n_lfcc=n_lfcc,
          norm="ortho",
      )
  
      lfcc_transform_norm_none = torchaudio.transforms.LFCC(
          sample_rate=sample_rate,
          n_filter=n_filter,
          n_lfcc=n_lfcc,
          norm=None,
      )
      torch_lfcc_norm_none = lfcc_transform_norm_none(
          audio
      )  # (1, 40, 161)
  
      norm_check = lfcc_transform(audio)  # (1, 40, 161)
      norm_check[:, 0, :] *= math.sqrt(n_filter) * 2
      norm_check[:, 1:, :] *= math.sqrt(n_filter / 2) * 2
  
      self.assertEqual(torch_lfcc_norm_none, norm_check)
  
imports: import math
  import torch
  import torchaudio
  import torchaudio.functional
  import torchaudio.transforms
  from torchaudio_unittest import common_utils
label_desc: Use image node_id 12 for calling the Tester obj's underlying member method code with example usage: obj.test_lfcc_norms() without return types