old_contents: from .delta import delta, construct_static_and_delta_matrix
  from .distance import melcd
  from .extfrm import extfrm
  from .hdf5 import HDF5, read_feats
  from .jnt import JointFeatureExtractor
  
new_contents: from .delta import delta, sddata, construct_static_and_delta_matrix
  from .distance import melcd
  from .extfrm import extfrm
  from .hdf5 import HDF5, read_feats
  from .jnt import estimate_twf
  
subject: change import path