I installed the Tensorflow(-gpu) version 1.8.0 as a pip package following these instructions. Upon installation, I opened a python3 console and typed in
impo
This is slightly late, but for anyone running into this issue, what fixed it for me was going into my /anaconda3/lib/python3.X/site-packages folder and manually removing numpy there. Replace python3.X with you version of course.
I also followed Wordsforthewise' suggestion and ran his first two commands before reinstalling numpy via pip. I ran into this problem on a google cloud shell.