I did run make_modules.sh.
In the lib/nms folder there exists a _ext folder but it’s not being recognized from python?
  File "/home/rzou/undefined-bug/pytorch-faster-rcnn/tools/../lib/model/nms_wrapper.py", line 11, in <module>
    from nms.pth_nms import pth_nms
  File "/home/rzou/undefined-bug/pytorch-faster-rcnn/tools/../lib/nms/pth_nms.py", line 2, in <module>
    from _ext import nms
ModuleNotFoundError: No module named '_ext'
[rzou@devgpu041.ash5 ~/undefined-bug/pytorch-faster-rcnn] ls lib/nms/_ext
__init__.py  nms