Thank you for comments.
I am just executing imagenet example on google colab with following instruction.
I try to change example code with your suggestion but another error appeared.
But just for my simple test, I will check it later.
Thanks again
Get examples and data (imagenett),  and update model (torchvision)
!wget https://s3.amazonaws.com/fast-ai-imageclas/imagenette-320.tgz
!tar xzf imagenette-320.tgz`
!git clone http://github.com/pytorch/examples
!pip uninstall -y torchvision
!git clone http://github.com/pytorch/vision
!cd vision;python setup.py install

Executing googlenet
!python examples/imagenet/main.py -a googlenet -j 2 -b 64 --epochs 10 imagenette-320/