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Huanran Chen

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#machine learning Preprint Sep 2026

Beyond Quadratic Loss: The Stability Phase Diagram of Adam

This work connects Adam loss spikes to both the mismatch between momentum timescales and finite-scale superquadratic loss geometry beyond the Hessian, and shows that confident cross-entropy losses develop a core--wall landscape comprising a narrow quadratic core followed by a steep wall, which produces effective superq...

Gao-Xiang Tang, Huan-Ran Chen, Zi-Ming Liu · 0 citations
#natural language process... Preprint Sep 2026

Membership Inference in Fine-tuned Diffusion Language Models via Token-level Memorization Asymmetry

This work identifies a phenomenon termed token-level memorization asymmetry through theoretical analysis of diffusion training dynamics and proposes Q-Skew, a quantile-weighted skewness-based indicator for membership inference on finetuned DLMs.

Sheng-Fang Zhai, Leo Marchyok, Yu-Ling Shi et al. · 1 citation · ⚡1

Replay-free Sequential Fine-tuning of Medical VLMs

The streamlined, replay-free approach proves highly effective on a new continual learning benchmark and a practical path toward building prehensive, continually-learning medical VLMs and advancing the development of medical AI.

Hefei Li, Yuhui Zhang, Xiaohan Wang et al. · 0 citations

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