ValueError: Unknown value 'vgg16-397923af.pth' for VGG16_Weights.

[William9Baker]

When it runs to ' features = list(vgg16('vgg16-397923af.pth').features)', the error in the title is reported.

[SMSD75]

The code has become quite old by now. So if you report the error probably I can help you more, but generally, you should be careful about the backward compatibility of the libraries.