code: def test_chroma_spectrogram(self):
      sample_rate = 8000
      transform = T.ChromaSpectrogram(
          sample_rate=sample_rate, n_fft=400
      )
      waveform = get_whitenoise(
          sample_rate=sample_rate, duration=0.05, n_channels=2
      )
      self.assert_grad(transform, [waveform], nondet_tol=1e-10)
  
file_path: audio/test/torchaudio_unittest/prototype/transforms/autograd_test_impl.py
imports: from typing import List
  import torch
  import torchaudio.prototype.transforms
  from torch.autograd import gradcheck, gradgradcheck
  from torchaudio_unittest.common_utils import get_spectrogram, get_whitenoise, TestBaseMixin
label_desc: Use image node_id 4 for calling the Autograd obj's underlying member method code with example usage: obj.test_chroma_spectrogram() without return types