code: def test_cpu_smoke_test(self, dtype):
      model = conformer_wav2vec2_base()
      self._smoke_test(model, torch.device("cpu"), dtype)
  
file_path: audio/test/torchaudio_unittest/prototype/conformer_wav2vec2_test.py
imports: import torch
  from parameterized import parameterized
  from torchaudio.prototype.models import conformer_wav2vec2_base, conformer_wav2vec2_pretrain_base, conformer_wav2vec2_pretrain_large
  from torchaudio_unittest.common_utils import disabledInCI, nested_params, skipIfNoCuda, torch_script, TorchaudioTestCase
label_desc: Use image node_id 2 for calling the TestConformerWav2Vec2 obj's underlying member method code with example usage: obj.test_cpu_smoke_test(dtype) without return types