Author

Yi-Cheng Qi

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Preprint Oct 2026

The Missing Corner: When Sharp Causal Bounds Fail to Compose

Sharp bounds on two potential-outcome means need not combine into sharp bounds on their difference. We characterize exactly when composition is guaranteed across environments sharing a joint potential-outcome law. For binary treatment and outcome, fix strict selection-probability bounds and interior treatment propensit...

Yi-Cheng Qi, Xiao Xiong · 0 citations

#artificial intelligence Preprint Oct 2026

Same Predictions, Different Harms: Causal Auditing of Patient World Models

Patient world models used for clinical trial simulation can agree on transition kernels and arm-specific risks, yet disagree on the fraction of patients harmed by switching treatment---the counterfactual quantity that matters for intervention-aware reasoning. We audit this reliability gap in a two-stage shared-response...

Yi-Cheng Qi, Xiao Xiong · 0 citations

Aug 2026

TeF-SAM: Prototype memory for medical lesion segmentation with text-free inference.

Experimental results show that TeF-SAM achieves competitive segmentation performance using only 1%-15% of the available paired reports and requires no text input during inference, and this work introduces Prototype-Driven Regional Lesion Detection (PRLD), which combines prototype-level semantic responses with multi-sca...

Jin-Xin Liang, Xiao-Ming Liu, Zhi-Yuan Zang et al. · Computerized Medical Imaging... · 0 citations