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Evaluating fine-tuning and retrieval-augmented generation for domain-specific language modeling in wood science
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Evaluating fine-tuning and retrieval-augmented generation for domain-specific language modeling in wood science
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Journal Article
Evaluating fine-tuning and retrieval-augmented generation for domain-specific language modeling in wood science
2026
Overview
Recent advances in large language models (LLMs) have produced impressive fluency, yet their application to specialized scientific domains like wood science remains limited. This study introduces WoodLLaMA, a domain-specific LLM fine-tuned on metadata from 16,929 wood science research articles, and examines the effects of fine-tuning and retrieval-augmented generation (RAG) on model performance. Evaluation utilized two datasets not included in the training data: a Journal question–answer (QA) set representing domain-specific expertise and a Wood Handbook QA set reflecting fundamental wood science knowledge. Using intrinsic metrics (perplexity) and QA-based metrics (cosine similarity, keyword matching, and BERTScores), along with qualitative case studies, fine-tuning was found to enhance linguistic fluency while RAG improved semantic alignment. Combining fine-tuning and RAG yielded the most robust and consistent performance. These results demonstrate the complementary value of fine-tuning and RAG for building domain-specific LLMs. The study offers a methodological framework for LLM evaluation and identifies future directions—such as leveraging full-text data, enabling multilingual support, integrating multimodal resources, and incorporating human-in-the-loop learning methods—for enhancing the performance and broadening the applicability of WoodLLaMA across a diverse range of domains.
Publisher
Springer Nature Singapore,Springer Nature B.V,SpringerOpen
