Hey,
The first error about Encoding probably appeared when you tried to open a file (ie model_save) with a format not editable with Jupyter Notebook (as Jupyter outputs this error when trying to edit non-text files 32)
Indeed, the model is saved in binary format (see source 38), therefore is not editable, so you get the jupyter corresponding error.
Nevertheless, you still are able to open the model in Python with torch.load, even if it has been recommended to save/load parameters.