I think the author may have linked to the wrong paper in their opening paragraph (hopefully they see this and update the link) https://arxiv.org/abs/2410.01201

I opened it wondering what RNNs were, and for anyone else wondering they are apparently Recurrent Neural Networks, though you find that answer if you continue reading on (though the lack of a definition kind of stopped me in my tracks).

If you are looking to learn about LSTMs and RNNs, I can't recommend this post enough:

https://colah.github.io/posts/2015-08-Understanding-LSTMs/

Another great one (just on RNNs) is:

http://karpathy.github.io/2015/05/21/rnn-effectiveness/

sorry about that - it should be fixed!