SemRAG: Semantic Knowledge-Augmented RAG for Improved Question-Answering

TL;DR

SemRAG enhances retrieval-augmented generation by integrating semantic chunking and knowledge graphs, significantly improving domain-specific question-answering without extensive fine-tuning, thus offering a scalable and resource-efficient solution.

Contribution

Introduces SemRAG, a novel framework combining semantic chunking and knowledge graphs to improve retrieval accuracy in domain-specific LLM applications without heavy fine-tuning.

Findings

Outperforms traditional RAG on MultiHop and Wikipedia datasets

Enhances retrieval relevance and correctness

Optimizes buffer sizes for better performance

Abstract

This paper introduces SemRAG, an enhanced Retrieval Augmented Generation (RAG) framework that efficiently integrates domain-specific knowledge using semantic chunking and knowledge graphs without extensive fine-tuning. Integrating domain-specific knowledge into large language models (LLMs) is crucial for improving their performance in specialized tasks. Yet, existing adaptations are computationally expensive, prone to overfitting and limit scalability. To address these challenges, SemRAG employs a semantic chunking algorithm that segments documents based on the cosine similarity from sentence embeddings, preserving semantic coherence while reducing computational overhead. Additionally, by structuring retrieved information into knowledge graphs, SemRAG captures relationships between entities, improving retrieval accuracy and contextual understanding. Experimental results on MultiHop RAG and Wikipedia datasets demonstrate SemRAG has significantly enhances the relevance and correctness of retrieved information from the Knowledge Graph, outperforming traditional RAG methods. Furthermore, we investigate the optimization of buffer sizes for different data corpus, as optimizing buffer sizes tailored to specific datasets can further improve retrieval performance, as integration of knowledge graphs strengthens entity relationships for better contextual comprehension. The primary advantage of SemRAG is its ability to create an efficient, accurate domain-specific LLM pipeline while avoiding resource-intensive fine-tuning. This makes it a practical and scalable approach aligned with sustainability goals, offering a viable solution for AI applications in domain-specific fields.