Plug-in and Fine-tuning: Bridging the Gap between Small Language Models and Large Language Models

• URL: http://arxiv.org/abs/2506.07424v1
• Date: Mon, 09 Jun 2025 04:45:13 GMT
• Title: Plug-in and Fine-tuning: Bridging the Gap between Small Language Models and Large Language Models
• Authors: Kyeonghyun Kim, Jinhee Jang, Juhwan Choi, Yoonji Lee, Kyohoon Jin, YoungBin Kim,
• Abstract summary: Large language models (LLMs) are renowned for their extensive linguistic knowledge and strong generalization capabilities.<n>Small language models (SLMs) are computationally efficient but often lack the broad generalization capacity of LLMs.<n>We propose PiFi, a novel framework that combines the strengths of both LLMs and SLMs to achieve high performance.
• Score: 9.50875832714468
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Large language models (LLMs) are renowned for their extensive linguistic knowledge and strong generalization capabilities, but their high computational demands make them unsuitable for resource-constrained environments. In contrast, small language models (SLMs) are computationally efficient but often lack the broad generalization capacity of LLMs. To bridge this gap, we propose PiFi, a novel framework that combines the strengths of both LLMs and SLMs to achieve high performance while maintaining efficiency. PiFi integrates a single frozen layer from an LLM into a SLM and fine-tunes the combined model for specific tasks, boosting performance without a significant increase in computational cost. We show that PiFi delivers consistent performance improvements across a range of natural language processing tasks, including both natural language understanding and generation. Moreover, our findings demonstrate PiFi's ability to effectively leverage LLM knowledge, enhancing generalization to unseen domains and facilitating the transfer of linguistic abilities.

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