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Chengdong Xu

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#natural language process... Preprint Oct 2026

Beyond Retrieval Failure: Understanding Why LLMs Miss Evidence in Multi-Hop RAG

Multi-hop retrieval-augmented generation (RAG) requires an agent to retrieve evidence for a sequence of dependent sub-questions. When a wrong answer lacks a required passage, the passage may be inaccessible to the retriever, or the agent may have failed to issue a query that would retrieve it. Standard retrieval evalua...

Jia-Qi Wei, Wen-Xuan Huang, Cheng-Dong Xu et al. · 0 citations
Jul 2026

Efficient Online LLM Watermark Detection via Rao-Blackwellized E-Processes

As large language models (LLMs) are increasingly deployed, reliable and efficient mechanisms for distinguishing AI-generated text from human-written content have become essential. Statistical watermarking has emerged as a promising solution, yet most existing methods are typically fixed-horizon procedures, precluding v...

Lu Luo, Dan-Dan Mo, Chengdong Xu et al. · 0 citations
Preprint Aug 2026

AgentPatch: Coarse-to-Fine Weak-Task Repair for Merging Agentic Multimodal Large Language Models

AgentPatch is proposed, a training-free coarse-to-fine repair framework that improves diverse merged backbones, alleviates weak-task degradation, and better balances weak-task recovery with the preservation of complementary search and agentic visual processing capabilities.

Zibo Shao, Baochen Xiong, Chengdong Xu et al. · 0 citations

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