code: def clean(cls, data):
      return data
  
file_path: nlpaug/nlpaug/augmenter/audio/audio_augmenter.py
imports: import numpy
  from nlpaug.util import Method
  from nlpaug import Augmenter
label_desc: Use image node_id 2 for calling the AudioAugmenter obj's underlying member method code with example usage: obj.clean(cls, data) and returns: data