ImportError on cv2.so
I know this is a little late, but I just got this same error with python 2.7 and opencv 3.1.0 on Ubuntu.  Turns out I had to reinstall opencv-python.  Running sudo pip install opencv-python did the trick.
I am trying to run fast-rcnn on a cluster, where cv2.so is not installed for public use. So I directly move the cv2.so into a PATH, but it turns as:
/lib64/libc.so.6: version `GLIBC_2.14' not found 
So I have to install the opencv on my local path again, this time it says:
ImportError: /home/username/.local/lib/python2.7/site-packages/cv2.so: undefined symbol: _ZN2cv11arrowedLineERNS_3MatENS_6Point_IiEES3_RKNS_7Scalar_IdEEiiid
This really confused me, could anyone give me a hand?