Import Error: No module named 'torch.nn'

I am new to pytorch. Thank you a lot for helping.
I have installed pytorch on py35 from source. And I went through a lot when installing torchvision (finally using --no-dept solved imperfectly)
Here is the problem, neither import torch.nn or import torchvision can work

It is worth to mention that I can only use torch when I am in the same directory with torch file.