module 'cv2' has no attribute 'xfeatures2d'

edit

• system： ubuntu18.04 jetson nano armv8
• nvcc 10.0 cuda 10.0
• gcc 7.5.0

more information please lookup github issue, the code in the opencv website is so poor.

I can find the submodules in opencv like face ximgproc but not found xfeatures2d.

SUBMODULES Error aruco bgsegm bioinspired cuda datasets detail dnn face fisheye flann freetype ft hfs img_hash instr ipp line_descriptor linemod ml motempl multicalib ocl ogl omnidir optflow plot ppf_match_3d reg rgbd saliency samples structured_light text utils videoio_registry videostab ximgproc xphoto