Papers by Hong yu
Exploiting Tree Structure for Credit Assignment in Reinforcement Learning with Large Language Models (2026.findings-acl)
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| Challenge: | Reinforcement learning has shown strong promise for strengthening reasoning ability of large language models, but sparse, delayed rewards make token-level credit assignment a central challenge. |
| Approach: | They propose a critic-free algorithm that rewards tokens that change the solution. |
| Outcome: | The proposed algorithm improves on in-distribution benchmarks and out-of-disttribution settings. |
Efficient and Effective Internal Memory Retrieval for LLM-Based Healthcare Prediction (2026.findings-acl)
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| Challenge: | Existing approaches to ground large language models in external knowledge are limited by hallucinations and a lack of granular medical context. |
| Approach: | They propose a framework that replaces external retrieval with internal, key-based knowledge access by encoding clinical information directly into the model’s parameter space. |
| Outcome: | The proposed framework achieves state-of-the-art performance across four benchmark healthcare outcome prediction datasets. |
DualAlign: Generating Clinically Grounded Synthetic Data (2026.findings-acl)
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| Challenge: | Large language models (LLMs) can generate fluent clinical text, but ensuring that such outputs are clinically grounded and useful for downstream modeling remains challenging. |
| Approach: | They propose a disease-agnostic framework for generating privacy-preserving, clinically faithful synthetic EHR narratives. |
| Outcome: | The proposed framework produces context-aware, symptom-rich sentences that more closely reflect real-world clinical documentation. |
RiTeK: A Dataset for Large Language Models Complex Reasoning over Textual Knowledge Graphs in Medicine (2026.findings-acl)
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Jiatan Huang, Mingchen Li, Zonghai Yao, Dawei Li, Yuxin Zhang, Zhichao Yang, Yongkang Xiao, Feiyun Ouyang, Xiaohan Li, Shuo Han, Hong yu
| Challenge: | Existing methods for retrieving medical textual knowledge Graphs struggle to perform well, a study finds . existing methods struggle to provide accurate answers to complex questions, he says . |
| Approach: | They synthesize user queries integrating diverse topological structures, relational information, and complex textual descriptions. |
| Outcome: | a new dataset for medical textual knowledge graphs shows that existing methods struggle to perform well . main bottlenecks lie in the scarcity of existing medical TKGs and the limited expressiveness of their topological structures . |
LLM-Based Multi-Agent Systems for Clinical Workflows: A Survey of AI Hospitals (2026.acl-long)
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| Challenge: | Large Language Models (LLMs) are moving from isolated text generation toward agentic work inside clinical workflows. |
| Approach: | They propose a workflow-level taxonomy for LLM-based multi-agent systems for clinical and healthcare workflows . they propose integration readiness levels, task-level instrumentation requirements and recurring workflow failure modes as a practical framework for comparing, evaluating and deploying clinical LLM agents and AI hospitals. |
| Outcome: | The proposed systems should be compared at the workflow level, rather than only by model components or end-task accuracy. |