As large language models improve, there is increasing interest in techniques that leverage these models' capabilities to refine their own outputs. In this work, we introduce Shepherd, a language model specifically tuned to critique responses and suggest refinements, extending beyond the capabilities of an untuned model to identify diverse errors and provide suggestions to remedy them. At the core of our approach is a high quality feedback dataset, which we curate from community feedback and human annotations. Even though Shepherd is small (7B parameters), its critiques are either equivalent or preferred to those from established models including ChatGPT. Using GPT-4 for evaluation, Shepherd reaches an average win-rate of 53-87% compared to competitive alternatives. In human evaluation, Shepherd strictly outperforms other models and on average closely ties with ChatGPT.
@article{arxiv.2308.04592,
title = {Shepherd: A Critic for Language Model Generation},
author = {Tianlu Wang and Ping Yu and Xiaoqing Ellen Tan and Sean O'Brien and Ramakanth Pasunuru and Jane Dwivedi-Yu and Olga Golovneva and Luke Zettlemoyer and Maryam Fazel-Zarandi and Asli Celikyilmaz},
journal= {arXiv preprint arXiv:2308.04592},
year = {2023}
}