Allow to access wrapped_module of exported models

[frostedoyster]

This feature would be very useful to access information about the underlying model

Contributor (creator of pull-request) checklist

• Tests updated (for new features and bugfixes)?
• Documentation updated (for new features)?
• Issue referenced (for PRs that solve an issue)?

Reviewer checklist

• CHANGELOG updated with public API or any other important changes?

[Luthaf]

This does not work unfortunately, since torch.nn.Module is not a valid TorchScript type. Can you access exported_model._module after loading an exported model? If yes, we could rename it to self.wrapped_module or something similar, and document that reading this field is fine, but writing to it is not.

[frostedoyster]

Yes, I was able to access ._module. Let's do that then. Perhaps we should also remove wrapped_module() from the documentation though, since it's not accessible anymore once the model is exported

[Luthaf]

Yes, that makes sense