code: def __repr__(self):
      if self.utt2ratio is None:
          return "{}(lower={}, upper={}, dbunit={})".format(
              self.__class__.__name__,
              self.lower,
              self.upper,
              self.dbunit,
          )
      else:
          return '{}("{}", dbunit={})'.format(
              self.__class__.__name__, self.utt2ratio_file, self.dbunit
          )
  
imports: import librosa
  import numpy
  import scipy
  import soundfile
  from espnet.utils.io_utils import SoundHDF5File
label_desc: Use image node_id 2 for calling the VolumePerturbation obj's underlying member method code with example usage: obj.__repr__() and returns: str, str