次の text-davinci-003 さんの回答、正しい?
> Yes, there is a difference between `import torch.nn as nn` and `from torch import nn`. The former imports the entire torch.nn module, while the latter only imports the nn submodule from torch. It is generally preferable to use the former, as it allows you to access all of the submodules within torch.nn, while the latter only allows you to access the nn submodule.