Hi all! I am also using the pytorch version of the notebooks (downloaded today, 25.Oct.20) and get the error that the notebooks cannot be read. There seem to be two reasons for this, both are bugs in the way the d2l team builds the books. One source of errors is the fact that some notebooks haven’t added the pytorch code yet. Instead of adding a note saying something like ‘not implemented yet’ it just produces a notebook of the size 0. The other source of errors is that those markdown files (which are the source of the notebook files), which don’t have a tag ‘pytorch’ included, are not converted to pytorch notebooks. This includes all index files (and I think generally all files without code). If you have the time, you could fix the first error in the build system (https://github.com/d2l-ai/d2l-book) . The second error needs to be fixed in the markdown files for the book, they need to add a tab all directive there (so I gather from the discussion on the build system). What we can do to get the index files and other text files: copy these files from the mxnet branch. They have no code and work also with the pytorch branch.