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Yiwei Lu

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#machine learning Preprint Sep 2025

Are Targeted Data Poisoning Attacks as Effective as We Think?

This paper identifies both the easiest and hardest to poison examples based on only clean model information, enabling both rigorous worst-case evaluation and proactive vulnerability-aware defense.

W. Xu, Chenyu Zhang, Yi-Han Wang et al. · 0 citations
Preprint Aug 2026

No Universal Signal Predicts Sample-Level LLM Regression under Version Updates

It is found that signal effectiveness is task-dependent: confidence is strongest on MCQ and simpler math, while likelihood/KL signals give the most frequent gains on harder math and code; no signal is universally best across model updates either, and some cross-version signals stay informative even when confidence fail...

Jiang-li Sheng, Yiwei Lu · 0 citations

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