old_contents: from .delta import delta, sddata, construct_static_and_delta_matrix
  from .distance import melcd
  from .extfrm import extfrm
  from .hdf5 import HDF5
  from .twf import estimate_twf
  
new_contents: from .delta import delta, static_delta, construct_static_and_delta_matrix
  from .distance import melcd
  from .extfrm import extfrm
  from .hdf5 import HDF5
  from .twf import estimate_twf
  
subject: modify __init__.py for static_delta