@Hamid, please try this:
wget https://s3.amazonaws.com/pytorch/whl/cu75/torch-0.1.8.post1-cp36-cp36m-linux_x86_64.whl
mv torch-0.1.8.post1-cp36-cp36m-linux_x86_64.whl torch-0.1.8.post1-cp36-none-linux_x86_64.whl
pip install torch-0.1.8.post1-cp36-none-linux_x86_64.whl

Let me know if that works.
Also, what is the output of:
pip3 --version
python3 --version