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Xu Zheng

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Open access 2026

CriticExpert: A Lightweight Task-Specific Verification-and-Correction Framework for LLM-Generated Closed-Set Specialized Healthcare Text Coding

Large language models (LLMs) have shown promise for healthcare text coding through in-context learning, yet their generated codes may still suffer from hallucination, inconsistency, and overconfidence. Although LLM-as-a-judge methods provide a flexible way to evaluate generated outputs, they are often computationally e...

Chao-Hao Lin, Xu Zheng, Kai-Da Wu et al. · 0 citations
#artificial intelligence Preprint Oct 2026

Do Time-Series QA Systems Read the Time Series? Evidence Use and Reasoning Reliability

In recent years, time-series question answering (QA) systems have made significant progress. However, generating a correct answer does not show whether retaining the supplied numerical series improves task performance, nor whether the prediction is sensitive to changes in that input. While some systems provide rational...

Zhuo-Min Chen, Jing-Chao Ni, Xu Zheng et al. · 0 citations
Preprint Aug 2026

Towards A Unified Information Bottleneck Framework for Time Series Explanations

A unified objective function for explainable time series learning that bridges attribution and counterfactual reasoning within a single framework is proposed and a novel explanation framework is introduced that learns a parametric transformation network to construct explanation-embedded instances.

Xu Zheng, Zichuan Liu, Zhuo-Min Chen et al. · 0 citations
Jul 2026

Information Bottleneck Learning for Faithful Time Series Forecasting Explanations

IB-Forecast is proposed, an inherently interpretable multivariate time-series forecasting framework that decomposes forecasting into a learned periodic component and a residual component computed with explainable masks over input tokens that guarantees high explanation fidelity.

Xu Zheng, Wei Cheng, Zhuomin Chen et al. · 2 citations
Jul 2026

Leveraging Trajectory Graphs for Pre-Execution Error Diagnosis in Agentic LLM Systems

This work proposes Trajectory Graph Copilot, a novel framework that acts as a ``copilot'' for LLM agents by diagnosing potential action errors before they are executed, significantly enhancing the agent's ability to complete long-horizon tasks successfully.

Xu Zheng, Zhuomin Chen, Chaohao Lin et al. · 0 citations
Jul 2026

Bridging Inference-Time Scaling and Episodic Memory with Action-Centric Graphs

A novel framework, \textit{GAMER}~(Graph-based Action-centric Memory with Episodic Reasoning), that bridges the gap between inference scaling and episodic memory by decoupling the memory mechanism from LLMs.

Xu Zheng, Chaohao Lin, Zhuomin Chen et al. · 0 citations

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