class_docstr: tf.signal feat unittest
class_docstr_tok: ["tf.signal","feat","unittest"]
code: def setUp(self):
      super().setUp()
      package_root = Path(PACKAGE_ROOT_DIR)
      self.params = tffeat.speech_params(sr=8000, bins=40, cmvn=False)
      self.wavpath = str(
          package_root.joinpath(
              "data/feat/python_speech_features/english.wav"
          )
      )
      self.sr_true, self.audio_true = load_wav(
          str(self.wavpath), sr=8000
      )
  
file_path: delta/delta/data/feat/tf_speech_feature_test.py
imports: import os
  from pathlib import Path
  import delta.compat
  from absl import logging
  from delta.data.feat.speech_feature import load_wav
  from delta.data.feat import tf_speech_feature
  from delta import PACKAGE_ROOT_DIR
label_desc: Use image node_id 1 for calling the SpeechFeatTest obj's underlying member method code with example usage: obj.setUp() without return types