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Yi-Zhou Sun

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#artificial intelligence Preprint Sep 2026

Component and Dimension Sparsity in Transformer Refusal Mechanisms

Activation steering manipulates large language model behavior by intervening on internal activations, but the mechanistic basis of these interventions remains poorly understood. We decompose refusal steering into component-level interventions across four open-weight models, identifying the sparse subsets of attention a...

Vincent Siu, Glenn Grant-Richards, Vlad Pavlovich et al. · 0 citations
Book Open access Nov 2025

CoRGI: GNNs with Convolutional Residual Global Interactions for Lagrangian Simulation

Partial differential equations (PDEs) govern dynamical systems in hydrodynamics, where classical solvers face well-known difficulties with nonlinearity and computational cost. Lagrangian neural surrogates such as GNS and SEGNN learn directly from particle-based simulations, but local message passing alone is limited in...

Ethan Ji, Yuanzhou Chen, Arush Ramteke et al. · 1 citation · ⚡1
#artificial intelligence Preprint Sep 2026

ACLArena: Agent Continue Learning in Multi-stage Post-training

This work introduces ACLArena, a framework for comprehensively studying, analyzing, and evaluating Agent Continual Learning, and proposes a new ACL recipe that combines offline replay over high-quality trajectories with a routed network of multiple LoRA experts each specialized via RL, substantially improving the agent...

Hai-Xin Wang, Xiao-Xuan Wang, Junkai Zhang et al. · 0 citations
Preprint Aug 2026

Hybrid Lagrangian-Eulerian Model for Lagrangian Fluid Simulation

A Hybrid Lagrangian-Eulerian neural simulator that augments Lagrangian dynamics with an Eulerian representation and substantially suppresses error accumulation is proposed, establishing a new state-of-the-art for accuracy and rollout stability in Lagrangian fluid simulation.

Ruo-Yan Li, Wei Wang, Yi-Zhou Sun · 0 citations
Jul 2026

RetroAgent: Harnessing LLMs to Search Over Structured Memory for Agentic Retrosynthesis Planning

RetroAgent is introduced, an LLM agent that bridges symbolic search and neural reasoning through a harness with structured memory, enabling informed decisions grounded in both global progress and domain knowledge in multi-step retrosynthesis planning.

Yanqiao Zhu, Jingru Gan, Xiaoqi Sun et al. · 1 citation

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