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Hongzhi Chen

3 accepted papers

2025

Retrieval-Augmented Generation with Hierarchical Knowledge

EMNLP 2025

Graph-based Retrieval-Augmented Generation (RAG) methods have significantly enhanced the performance of large language models (LLMs) in domain-specific tasks. However, existing RAG methods do not adequately utilize the naturally inherent hierarchical knowledge in human cognition, which limits the ca

2020

Measuring and Improving the Use of Graph Information in Graph Neural Networks

ICLR 2020poster

Graph neural networks (GNNs) have been widely used for representation learning on graph data. However, there is limited understanding on how much performance GNNs actually gain from graph data. This paper introduces a context-surrounding GNN framework and proposes two smoothness metrics to measure t…

Cited by 0SourcecodeScholar
2018

Norm-Ranging LSH for Maximum Inner Product Search

NeurIPS 2018poster

Neyshabur and Srebro proposed SIMPLE-LSH, which is the state-of-the-art hashing based algorithm for maximum inner product search (MIPS). We found that the performance of SIMPLE-LSH, in both theory and practice, suffers from long tails in the 2-norm distribution of real datasets. We propose NORM-RANG…