Sorry for late comment 
Thx for your advice, I finally solve the problem.
I change the value of a & b like

init.uniform_(m.weight.data, 1.0, 0.02)
to
init.uniform_(m.weight.data, 0.02, 1.0)

After that, I install the torchvision using in different way

conda install torchvision -c pytorch
instead of
pip install torchvision

and I work 
I really appreciate your help!!!