Is get_signature or parse_type_line abandoned?

As title, can someone please tell me that were get_signature and parse_type_line abandoned in the latest version of pytorch? If not, why I cannot find any caller of these two functions. Or is there any way for to trigger one of these two functions by a normal way not just call such as using @torch.jit.script or something else? If they are abandoned, why they were not removed from the source code.

Hope to get reply! Thanks a lot!