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SLiC-HF: Sequence Likelihood Calibration with Human Feedback (arxiv.org)
2 points by tim_sw on May 18, 2023 | hide | past | pdf | discuss on HN

In plain words: Instead of training a reward scorer and tuning with reinforcement learning, it raises the likelihood of answers people preferred over ones they rejected, using data from another model. On summarization it beat supervised training and matched the reinforcement-learning method while being simpler and cheaper.

Abstract

Learning from human feedback has been shown to be effective at aligning language models with human preferences. Past work has often relied on Reinforcement Learning from Human Feedback (RLHF), which optimizes the language model using reward scores assigned from a reward model trained on human preference data. In this work we show how the recently introduced Sequence Likelihood Calibration (SLiC), can also be used to effectively learn from human preferences (SLiC-HF). Furthermore, we demonstrate this can be done with human feedback data collected for a different model, similar to off-policy, offline RL data. Automatic and human evaluation experiments on the TL;DR summarization task show that SLiC-HF significantly improves supervised fine-tuning baselines. Furthermore, SLiC-HF presents a competitive alternative to the PPO RLHF implementation used in past work while being much simpler to implement, easier to tune and more computationally efficient in practice.

Yao Zhao, Rishabh Joshi, Tianqi Liu, Misha Khalman, Mohammad Saleh, Peter J. Liu
arXiv:2305.10425 · cs.CL, cs.AI · submitted May 17, 2023
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