code: def test_save_amr_nb(self, bit_rate):
      self.assert_save_consistency(
          "amr-nb",
          compression=bit_rate,
          num_channels=1,
          test_mode="path",
      )
  
imports: import io
  import os
  from functools import partial
  import torch
  from parameterized import parameterized
  from torchaudio._backend.utils import get_save_func
  from torchaudio_unittest.common_utils import get_wav_data, load_wav, nested_params, PytorchTestCase, save_wav, skipIfNoExec, skipIfNoSox, skipIfNoSoxEncoder, sox_utils, TempDirMixin, TorchaudioTestCase
  from .common import get_enc_params, name_func
label_desc: Use image node_id 8 for calling the SaveTest obj's underlying member method code with example usage: obj.test_save_amr_nb(bit_rate) without return types