def METHOD_NAME(self):
    self._input_lattices = self._read_file(
        os.path.join(data_dir, "lattices.dat"))
    self._niggli_lattices = self._read_file(
        os.path.join(data_dir, "niggli_lattices.dat"))
    self._delaunay_lattices = self._read_file(
        os.path.join(data_dir, "delaunay_lattices.dat"))