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Innovative Approaches to Data Curation and Retrieval-Augmented Generation: From Annotation and Preparation to Retrieval

Yushi Sun

2025

Abstract

This thesis investigates the challenges and advancements in data curation and Retrieval-Augmented Generation (RAG), addressing critical issues that impact the effectiveness of Large Language Models (LLMs). In recent years, RAG has garnered significant attention for its potential to reduce hallucination problems inherent in LLMs by integrating relevant external data sources. However, the success of RAG relies heavily on the quality of the curated data, which must undergo rigorous annotation, and preparation processes. ac The first work addresses the complexities of data annotation by presenting a novel cross-domain task allocation scheme to optimize annotator training and selection in crowdsourced scenarios. The second work shifts focus to data preparation, introducing an innovative framework for column semantic type annotation that considers inter-table context, thereby enhancing the effectiveness of data preparation. Finally, the third work explores the implementation of knowledge-based RAG approaches in the context of LLMs. We investigate strategies to effectively manage knowledge overloading and the complexities of multi-hop queries, developing a retrieval content summarization method tailored for knowledge base question answering. Collectively, these contributions aim to enhance the reliability and effectiveness of RAG for more robust AI systems capable of delivering accurate and contextually relevant responses. Through these contributions, this thesis not only…

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