It seems that line 234 in prepare_coco_stuff_164k_sem_seg.py has a wrong dir name

[AaronNZH]

for dir_name in [ "train2017", "test2017", "train2017_base", "train2017_novel", "val2017_base", "val2017_novel", ]:

should be

for dir_name in [ "train2017", "val2017", "train2017_base", "train2017_novel", "val2017_base", "val2017_novel", ]:

[LancasterLi]

for dir_name in [ "train2017", "test2017", "train2017_base", "train2017_novel", "val2017_base", "val2017_novel", ]:

should be

for dir_name in [ "train2017", "val2017", "train2017_base", "train2017_novel", "val2017_base", "val2017_novel", ]:

Thanks, it can fix my problem.