code: def __repr__(self):
      return "{name}(norm_means={norm_means}, norm_vars={norm_vars})".format(
          name=self.__class__.__name__,
          norm_means=self.norm_means,
          norm_vars=self.norm_vars,
      )
  
file_path: espnet/espnet/transform/cmvn.py
imports: import io
  import h5py
  import kaldiio
  import numpy
label_desc: Use image node_id 2 for calling the UtteranceCMVN obj's underlying member method code with example usage: obj.__repr__() and returns: str