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Q-Probe: A Lightweight Approach to Reward Maximization for Language Models
Feb. 23, 2024, 5:42 a.m. | Kenneth Li, Samy Jelassi, Hugh Zhang, Sham Kakade, Martin Wattenberg, David Brandfonbrener
cs.LG updates on arXiv.org arxiv.org
Abstract: We present an approach called Q-probing to adapt a pre-trained language model to maximize a task-specific reward function. At a high level, Q-probing sits between heavier approaches such as finetuning and lighter approaches such as few shot prompting, but can also be combined with either. The idea is to learn a simple linear function on a model's embedding space that can be used to reweight candidate completions. We theoretically show that this sampling procedure is …
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