Large Language Models are In-context Teachers for Knowledge Reasoning

• URL: http://arxiv.org/abs/2311.06985v3
• Date: Fri, 04 Oct 2024 05:00:24 GMT
• Title: Large Language Models are In-context Teachers for Knowledge Reasoning
• Authors: Jiachen Zhao, Zonghai Yao, Zhichao Yang, Hong Yu,
• Abstract summary: We study in-context teaching (ICT) where a teacher provides in-context example rationales to teach a student to reason over unseen cases. We ask whether a large language model (LLM) can serve as a more effective in-context teacher for itself or other LLMs, compared to humans.
• Score: 8.869111204842248
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• Abstract: In this work, we study in-context teaching (ICT), where a teacher provides in-context example rationales to teach a student to reason over unseen cases. Human teachers are usually required to craft in-context demonstrations, which are costly and have high variance. We ask whether a large language model (LLM) can serve as a more effective in-context teacher for itself or other LLMs, compared to humans. Inspired by the Encoding Specificity Hypothesis from human episodic memory, we hypothesize that in-context exemplars crafted by the teacher should match the training data of the student. This hypothesis motivates us to propose Self-Explain where an LLM's self-elicited explanations are used as in-context demonstrations for prompting it as they are generalized from the model's training examples. Self-Explain is shown to significantly outperform using human-crafted exemplars and other baselines. Furthermore, we reveal that for ICT, rationales from different teacher LLMs or human experts that more resemble the student LLM's self-explanations are better in-context demonstrations. This supports our encoding specificity hypothesis. We then propose Teach-Back that aligns a teacher LLM with the student to enhance the ICT performance. For example, Teach-Back enables a 7B model to teach the much larger GPT-3.5 in context, surpassing human teachers by around 5% in test accuracy on medical question answering.

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