In wav2lip project, if use argument --face_enhancement, GPEN-512.pdparams will be downloaded automatically. Where does this weights come from? How can I train this weights?

[yang-ruixin]

Dear authors, When I try wav2lip, if use argument --face_enhancement, GPEN-512.pdparams will be downloaded automatically. Where does this weights come from? How can I train this weights? Thanks in advance.