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Xin Chen

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#artificial intelligence Preprint Sep 2026

Local Sparsity Enables Unsupervised LLM Safety Detection

This work proposes a framework for locally masked SAE-based anomaly detection, supported by theoretical justifications, and demonstrates their ability to capture meaningful safety information while using only 1-2% of SAE neurons for computation.

Xin Chen, Gil Kur, A. Shevchenko et al. · 0 citations
#artificial intelligence Preprint Sep 2026

xDailyBench: Benchmarking LLMs on Professional Consultation for Real-Life Problems

Large language models (LLMs) are increasingly used for everyday assistance, yet existing benchmarks only partially reflect the requests users naturally make in practice. Real-world requests are often open-ended, casually specified, and context-dependent, requiring models not only to follow explicit instructions but als...

Yong Peng, Qing-Shui Gu, Li-Ya Zhu et al. · 0 citations
Preprint Aug 2026

Enhancing VLM Reward Models Through Structure-Aware Fine-Tuning

Designing effective reward functions remains a major bottleneck in Reinforcement Learning (RL). Recent work uses large foundation Vision-Language Models (VLMs) as reward models, computing text-observation similarity to bypass manual reward engineering. Although promising, these rewards are often noisy and unreliable, l...

Pyrros Koussios, Chen-Hao Li, Xin Chen et al. · 0 citations

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