Earlier quoted context omitted.
RLHF is not part of LLaMa pretraining, or pretraning of any other models for that matter. RLHF comes after pretraining. https://twitter.com/Jeande_d/status/1661833563069620247/phot...
I see, that’s my misunderstanding I was grouping all training as pretraining
SFT and RLHF is attempting to further guide the model in terms of steerability + alignment of output.
In fact, the InstructGPT authors were worried about losing the pre-trained model's underlying probability distribution, so they try a version where it penalizes the model deviating too significantly from the original distribution (using KL). I don't remember them seeing a significant difference in performance.