code: def test_freq_ir(self):
      mags = torch.tensor(
          [0, 0.5, 1.0],
          device=self.device,
          dtype=self.dtype,
          requires_grad=True,
      )
      assert gradcheck(F.frequency_impulse_response, (mags,))
  
file_path: audio/test/torchaudio_unittest/prototype/functional/autograd_test_impl.py
imports: import math
  import torch
  import torchaudio.prototype.functional
  from parameterized import parameterized
  from torch.autograd import gradcheck
  from torchaudio_unittest.common_utils import TestBaseMixin
label_desc: Use image node_id 4 for calling the AutogradTestImpl obj's underlying member method code with example usage: obj.test_freq_ir() without return types