Llama transformer walkthrough

[bdzwillo]

Hello,

I made a llama2 transformer overview based on code examples available
here on github: https://github.com/bdzwillo/llama_walkthrough

This is based on a presentation I gave to my colleagues. This uses a
cloned version of llama2.c with some added command line options. It
served very well for educational purposes.

@karpathy if you like you might add a link to your README.