code: def _min_max(self, data):
      lower = np.amin(np.abs(data))
      return (data - lower) / (np.amax(np.abs(data)) - lower)
  
file_path: nlpaug/nlpaug/model/audio/normalization.py
imports: import numpy
  from nlpaug.model.audio import Audio
label_desc: Use image node_id 5 for calling the Normalization obj's underlying member method code with example usage: obj._min_max(data) and returns: unknown