docstr: frequency_impulse_response warns negative input value
docstr_tok: ["frequency_impulse_response","warns","negative","input","value"]
code: def test_freq_ir_warns_negative_values(self):
      """frequency_impulse_response warns negative input value"""
      magnitudes = -torch.ones(
          (1, 30), device=self.device, dtype=self.dtype
      )
      with self.assertWarnsRegex(
          UserWarning, "^.+should not contain negative values.$"
      ):
          F.frequency_impulse_response(magnitudes)
  
imports: import torch
  import torchaudio.prototype.functional
  from parameterized import param, parameterized
  from torchaudio_unittest.common_utils import nested_params, TestBaseMixin
  from .dsp_utils import exp_sigmoid, freq_ir, oscillator_bank, sinc_ir
label_desc: Use image node_id 8 for calling the FunctionalTestImpl obj's underlying member method code with example usage: obj.test_freq_ir_warns_negative_values() without return types