code: def load_audio(self, wav):
      wav = os.path.abspath(os.path.expanduser(wav))
      assert os.path.isfile(wav), "Please check wav file: {}".format(
          wav
      )
      waveform, _ = paddleaudio.load(
          wav, sr=self.sr, mono=True, normal=False
      )
      return waveform
  
file_path: PaddleHub/modules/audio/keyword_spotting/kwmlp_speech_commands/module.py
imports: import os
  import numpy
  import paddle
  import paddleaudio
  from .feature import compute_mfcc
  from .kwmlp import KW_MLP
  from paddlehub.module.module import moduleinfo
  from paddlehub.utils.log import logger
label_desc: Use image node_id 2 for calling the KWS obj's underlying member method code with example usage: obj.load_audio(wav) and returns: waveform