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Yuanchen Bei

3 accepted papers

2025

A Survey of RAG-Reasoning Systems in Large Language Models

EMNLP 2025

Retrieval-Augmented Generation (RAG) lifts the factuality of Large Language Models (LLMs) by injecting external knowledge, yet it falls short on problems that demand multi-step inference; conversely, purely reasoning-oriented approaches often hallucinate or mis-ground facts. This survey synthesizes

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2025

Understanding and Enhancing Message Passing on Heterophilic Graphs via Compatibility Matrix

NeurIPS 2025poster

Graph Neural Networks (GNNs) excel in graph mining tasks thanks to their message-passing mechanism, which aligns with the homophily assumption. However, connected nodes can also exhibit inconsistent behaviors, termed heterophilic patterns, sparking interest in heterophilic GNNs (HTGNNs). Although th…

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2024

Fine Tuning Out-of-Vocabulary Item Recommendation with User Sequence Imagination

NeurIPS 2024spotlight

Recommending out-of-vocabulary (OOV) items is a challenging problem since the in-vocabulary (IV) items have well-trained behavioral embeddings but the OOV items only have content features. Current OOV recommendation models often generate 'makeshift' embeddings for OOV items from content features and…

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