Ax Afonso Simpl\'icio, Gon\c{c}alo Vinagre, Miguel Moura Ramos, Diogo Tavares, Rafael Ferreira, Giuseppe Attanasio, Duarte M. Alves, In\^es Calvo, In\^es Vieira, Rui Guerra, James Furtado, Beatriz Canaverde, Iago Paulo, Vasco Ramos, Diogo Gl\'oria-Silva, Miguel Faria, Marcos Treviso, Daniel Gomes, Pedro Gomes, David Semedo, Andr\'e Martins, Jo\~ao Magalh\~aes 3/30/2026

AMALIA Technical Report: A Fully Open Source Large Language Model for European Portuguese

AMALIA: fully open source LLM trained on high-quality European Portuguese data with native evaluation benchmark and improved pt-PT representation.

Ax Shaoxuan Li, Zhixuan Zhao, Hanze Deng, Zirun Ma, Shulin Tian, Zuyan Liu, Yushi Hu, Haoning Wu, Yuhao Dong, Benlin Liu, Ziwei Liu, Ranjay Krishna 3/30/2026

PerceptionComp: A Video Benchmark for Complex Perception-Centric Reasoning

Video benchmark for complex perception reasoning requiring multiple temporally separated visual evidence pieces and compositional logic.

Ax Md Ashiqur Rahman, Lim Jun Hao, Jeremiah Jiang, Teck-Yian Lim, Raymond A. Yeh 3/30/2026

Tunable Soft Equivariance with Guarantees

Framework for constructing soft equivariant computer vision models by projecting weights into designed subspaces with theoretical bounds.

Ax Dung V. Nguyen, Hieu M. Vu, Nhi Y. Pham, Lei Zhang, Tan M. Nguyen 3/30/2026

Activation Steering with a Feedback Controller

Control-theoretic framework for LLM activation steering with feedback controllers, connecting empirical steering methods to proportional control theory for safety alignment.

Ax Tiansheng Wen, Yifei Wang, Aosong Feng, Long Ma, Xinyang Liu, Yifan Wang, Lixuan Guo, Bo Chen, Stefanie Jegelka, Chenyu You 3/30/2026

Route Experts by Sequence, not by Token

Sequence-level TopK (SeqTopK) improves Mixture-of-Experts routing in LLMs by adapting expert assignment per sequence rather than per token without retraining.

Ax R Sri Prakash, Nikhil Karamchandani, Sharayu Moharir 3/30/2026

Cascading Bandits With Feedback

Cascading Bandits analyzes decision-making policies for edge inference with multiple models, providing theoretical regret guarantees for Explore-then-Commit and Thompson Sampling approaches.