class_docstr: speech feat entrypoint unittest
class_docstr_tok: ["speech","feat","entrypoint","unittest"]
docstr: test load wav 
docstr_tok: ["test","load","wav"]
code: def test_load_wav(self):
      """test load wav"""
      sample_rate, audio = speech_feature.load_wav(
          self.wavfile, sr=self.sr
      )
      audio_true, sample_rate_true = librosa.load(
          self.wavfile, sr=self.sr
      )
  
      self.assertEqual(sample_rate, sample_rate_true)
      self.assertEqual(sample_rate, self.sr)
      self.assertAllClose(audio, audio_true)
  
file_path: delta/delta/data/feat/speech_feature_test.py
imports: import os
  from pathlib import Path
  import librosa
  import numpy
  import delta.compat
  from absl import logging
  from delta.data.feat import speech_ops
  from delta.data.feat import speech_feature
  from delta import PACKAGE_ROOT_DIR
label_desc: Use image node_id 3 for calling the SpeechFeatureTest obj's underlying member method code with example usage: obj.test_load_wav() without return types