CBF-LLM: Safe Control for LLM Alignment

While large language models (LLMs) are known to have strong language understanding and generation abilities, they can also generate harmful, biased, and toxic content [1][2]. Alignment of LLMs ensures that they generate content that is "desirable" for the user, typically meaning content that is safe and ethical. Various approaches for LLM alignment have been presented ([1], [2], [3] and reference therein). The major approach to the alignment is reinforcement learning from human feedback (RLHF) [4], where a reward model is constructed by human feedback and used for the training of LLMs. Variants of RLHF architectures are also proposed, such as Safe-RLHF [5], SENSEI [6], and f-DPG [7], and their implementations are presented, such as training pre-trained LLMs [8][9], and applications like information-seeking chatbot [10].