I also tend to use cython accelerate the graoh training speed. Now I need to use third party metis without add other files, it will output error LNK1120: 1 unresolved externals.

Your pgl's third party metis just add win.h and win.c which have fake function like METIS_Kway_win32 and it works.

Why it works in cython. I read cython's document in using c++ third party , it hasn't talk about add files such as win.h.
Does it mean when use third party in cython , we must to add win.h and win.c to make pyx work？I mean use a fake func to compile， and use original func to work, because I only see win == 0.