Is In-Context Learning Sufficient for Instruction Following in LLMs?

• URL: http://arxiv.org/abs/2405.19874v2
• Date: Fri, 04 Oct 2024 12:39:20 GMT
• Title: Is In-Context Learning Sufficient for Instruction Following in LLMs?
• Authors: Hao Zhao, Maksym Andriushchenko, Francesco Croce, Nicolas Flammarion,
• Abstract summary: We show that, while effective, ICL alignment withAL still underperforms compared to instruction fine-tuning on the established benchmark MT-Bench. We provide the first, to our knowledge, systematic comparison of ICL and instruction fine-tuning (IFT) for instruction following in the low data regime.
• Score: 38.29072578390376
• License:
• Abstract: In-context learning (ICL) allows LLMs to learn from examples without changing their weights: this is a particularly promising capability for long-context LLMs that can potentially learn from many examples. Recently, Lin et al. (2024) proposed URIAL, a method using only three in-context examples to align base LLMs, achieving non-trivial instruction following performance. In this work, we show that, while effective, ICL alignment with URIAL still underperforms compared to instruction fine-tuning on the established benchmark MT-Bench, especially with more capable base LLMs. We then uncover the most relevant elements for successful in-context alignment, finding the crucial role of the decoding parameters. Based on these insights, we show that the approach of URIAL can indeed be improved by adding high-quality, potentially carefully selected via greedy search, demonstrations in context, getting closer to the performance of instruct models. Finally, we provide the first, to our knowledge, systematic comparison of ICL and instruction fine-tuning (IFT) for instruction following in the low data regime, where ICL can be a viable alternative to IFT. Overall, our work advances the understanding of ICL as an alignment technique and its relationship to IFT. We provide our code at https://github.com/tml-epfl/icl-alignment.

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