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Yi-Zhou Sun

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#artificial intelligence Preprint Sep 2026

Component and Dimension Sparsity in Transformer Refusal Mechanisms

Together these findings show that refusal is not diffusely encoded across a transformer but assembled by a structured, identifiable mechanism, providing a foundation for mechanistic understanding of how refusal behaviors are represented and steered.

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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