The additional link is indeed very useful, however, with one exception, it is limited to inference, ie code for evaluating a model using somebody else’s trained

The additional link is indeed very useful, however, with one exception, it is limited to inference, ie code for evaluating a model using somebody else’s trained model weights. The original link has code for training (which can also be used for inference, of course.) Inference is super important, of course, so it makes a lot of sense to put effort to make it work well on all kinds of hardware; the papers typically focus on training and only then evaluating/validating a new model.