Author

Zihan Xu

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Conference Jul 2026

X-FEMR: A Token-level Explainable Approach for Electronic Health Records Foundation Models using Transformer-based Models

This work trains a Transformer-based surrogate model on input-output pairs from the FEMR across two prediction tasks, approximating its behavior while preserving temporal dynamics, and introduces a novel clinical alignment metric that quantifies the correspondence between the surrogate model’s key tokens and clinically...

Jie Huang, Peng Yin, Zihan Xu et al. · Proceedings of the Thirty-Fi... · 0 citations

Jul 2026

LongMedBench: Benchmarking Medical Agents for Long-Horizon Clinical Decision-Making

This work introduces LongMedBench, a real-world EHR-based benchmark for long-horizon clinical decision-making, and proposes an evaluation taxonomy with three suites: fact-based QA, temporal reasoning, and long-horizon decision-making.

Zihan Xu, Yan-Zhe Chen, Xiaochen Zhang et al. · arXiv.org · 0 citations

Preprint Aug 2026

Locating Failure in Multi-Page Visually Rich Document Understanding: An Empirical Attribution

It is found that vision is necessary but does not replace text extraction, that missing pages bound accuracy while distractors cost little, and that reasoners fail to integrate evidence across pages even when it is fully supplied.

Lewei Xu, Yihao Ding, Zihan Xu et al. · 0 citations