code: def manipulate(self, data, start_pos, end_pos, speed):
      aug_data = librosa.effects.time_stretch(
          y=data[start_pos:end_pos], rate=speed
      )
      return np.concatenate(
          (data[:start_pos], aug_data, data[end_pos:]), axis=0
      )
  
imports: import numpy
  from nlpaug.model.audio import Audio
label_desc: Use image node_id 2 for calling the Speed obj's underlying member method code with example usage: obj.manipulate(data, start_pos, end_pos, speed) and returns: np