class_docstr: Cepstrum extraction test.
code: def test_cepstrum(self):
      wav_path = str(Path(PACKAGE_OPS_DIR).joinpath("data/sm1_cln.wav"))
  
      with self.cached_session(use_gpu=False, force_gpu=False):
          read_wav = ReadWav.params().instantiate()
          input_data, sample_rate = read_wav.call(wav_path)
          input_data = input_data / 32768
          cepstrum = Cepstrum.params(
              {"window_length": 0.025}
          ).instantiate()
          cepstrum_test = cepstrum(input_data, sample_rate)
  
          output_true = np.array(
              [
                  [0.525808, 0.579537, 0.159656, 0.014726, -0.1866810],
                  [0.225988, 1.557304, 3.381828, 0.132935, 0.7128600],
                  [
                      -1.832759,
                      -1.045178,
                      0.753158,
                      0.116107,
                      -0.9307780,
                  ],
                  [-0.696277, 1.333355, 1.590942, 2.041829, -0.0805630],
                  [-0.377375, 2.984320, 0.036302, 3.676640, 1.1709290],
              ]
          )
  
file_path: delta/delta/data/frontend/cepstrum_test.py
imports: import numpy
  from pathlib import Path
  import delta.compat
  from core.ops import PACKAGE_OPS_DIR
  from delta.data.frontend.read_wav import ReadWav
  from delta.data.frontend.cepstrum import Cepstrum
label_desc: Use image node_id 1 for calling the CepstrumTest obj's underlying member method code with example usage: obj.test_cepstrum() without return types