def METHOD_NAME(cls):
    cls.utypes = ("u2", "u4", "u8")
    cls.utype_map = {"u2": np.uint16, "u4": np.uint32, "u8": np.uint64}
    cls.itype_map = {"u2": np.int16, "u4": np.int32, "u8": np.int64}
    cls.format_map = {"u2": "I", "u4": "J", "u8": "K"}