code: def __init__(
      self, norm_means=True, norm_vars=False, std_floor=1.0e-20
  ):
      self.norm_means = norm_means
      self.norm_vars = norm_vars
      self.std_floor = std_floor
  
file_path: espnet/espnet/transform/cmvn.py
imports: import io
  import h5py
  import kaldiio
  import numpy
label_desc: Use image node_id 1 to create a new UtteranceCMVN object from inherited base classes: object with example: obj = UtteranceCMVN(norm_means, norm_vars, std_floor)