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Dan-Dan Guo

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#artificial intelligence Preprint Sep 2026

Mitigating LLM Over-Refusal via Dynamic Semantic Routing Calibration

Large language models (LLMs) aligned for safety often suffer from over-refusal, incorrectly rejecting benign yet safety-related instructions. Prior studies primarily attribute this to static representation overlap, largely overlooking the underlying dynamic mechanisms. In this paper, we present the mechanistic analysis...

Zi-Xuan Wang, Bing-Jie Zhang, He Zhao et al. · 0 citations
Review Jul 2026

Self-Improvements in Modern Agentic Systems: A Survey

This survey frames modern self-improving agents as adaptive systems that convert experience into accumulated capability gains, and offers a system-level framework that represents a modern agent as a configuration coupling a foundation model with an operational scaffold of prompts, memory, tools, and control logic.

Zhen-Jiang Ren, Yi-Meng Chen, Dan-Dan Guo et al. · 9 citations · ⚡1

Bayesian Sparse Low-Rank Adaptation for Large Language Model Uncertainty Estimation

Data-Adaptive Lower-Rank Adaptation (DALorRA), a simple and effective variational Bayesian sparse framework that shifts the paradigm of uncertainty quantification from the dense parameter space to the lightweight rank level of low-rank adaptation (LoRA).

Ji-Jie Zhang, Zhenjiang Ren, Quan Zhang et al. · 0 citations
#machine learning Preprint Jul 2026

SpecGradFilter: A Spectral Gradient Filtering Framework for Taming Federated Heterogeneity

This work revisits client drift from a novel frequency-domain perspective and uncovers a critical Spectral Bias of Drift: inter-client gradient divergence is predominantly concentrated in low-frequency components which encode client-specific distributional shifts, while high-frequency components representing fine-grain...

Liyang Yuan, Yibo Yang, Dandan Guo et al. · 0 citations
Preprint Jul 2026

FedFFT: Taming Client Drift in Federated SAM via Spectral Perturbation Filtering

Experimental evidence from a new perspective, the frequency domain, for SAM perturbations in federated settings is provided, revealing that inter-client perturbation inconsistencies are predominantly concentrated in the low-frequency spectrum.

Liyang Yuan, Yibo Yang, Dandan Guo · 0 citations

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