[P] Llama2 inference in a single file of pure Mojo

Hi everyone!

I was really excited that Mojo became publicly available and thinking which project can I implement to learn Mojo concepts. Since I have already ported llama2.c to [pure Python](https://www.reddit.com/r/MachineLearning/comments/15qcbel/p_llama2py/), I decided why not try to port llama2.py to Mojo now.. And here is what I got

First round of llama2.c vs llama2.🔥 battle. Mojo demonstrated 20% better performance than C in a single threaded execution of llama2 inference and 250x times better performance than Python

https://i.redd.it/0gcwwfc2r7ob1.gif

For reference …

inference llama2 machinelearning mojo operations performance python reference vectorization