Fine-Tuning Large Language Models and Evaluating Retrieval Methods for Improved Question Answering on Building Codes

• URL: http://arxiv.org/abs/2505.04666v1
• Date: Wed, 07 May 2025 05:04:30 GMT
• Title: Fine-Tuning Large Language Models and Evaluating Retrieval Methods for Improved Question Answering on Building Codes
• Authors: Mohammad Aqib, Mohd Hamza, Qipei Mei, Ying Hei Chui,
• Abstract summary: Building codes are regulations that establish standards for the design, construction, and safety of buildings to ensure structural integrity, fire protection, and accessibility.<n>Key difficulties include navigating large volumes of text, interpreting technical language, and identifying relevant clauses across different sections.<n>A potential solution is to build a Question-Answering (QA) system that answers user queries based on building codes.<n>Among the various methods for building a QA system, Retrieval-Augmented Generation (RAG) stands out in performance.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Building codes are regulations that establish standards for the design, construction, and safety of buildings to ensure structural integrity, fire protection, and accessibility. They are often extensive, complex, and subject to frequent updates, making manual querying challenging and time-consuming. Key difficulties include navigating large volumes of text, interpreting technical language, and identifying relevant clauses across different sections. A potential solution is to build a Question-Answering (QA) system that answers user queries based on building codes. Among the various methods for building a QA system, Retrieval-Augmented Generation (RAG) stands out in performance. RAG consists of two components: a retriever and a language model. This study focuses on identifying a suitable retriever method for building codes and optimizing the generational capability of the language model using fine-tuning techniques. We conducted a detailed evaluation of various retrieval methods by performing the retrieval on the National Building Code of Canada (NBCC) and explored the impact of domain-specific fine-tuning on several language models using the dataset derived from NBCC. Our analysis included a comparative assessment of different retrievers and the performance of both pre-trained and fine-tuned models to determine the efficacy and domain-specific adaptation of language models using fine-tuning on the NBCC dataset. Experimental results showed that Elasticsearch proved to be the most robust retriever among all. The findings also indicate that fine-tuning language models on an NBCC-specific dataset can enhance their ability to generate contextually relevant responses. When combined with context retrieved by a powerful retriever like Elasticsearch, this improvement in LLM performance can optimize the RAG system, enabling it to better navigate the complexities of the NBCC.

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