Ax Yufei Xu, Fanxu Meng, Fan Jiang, Yuxuan Wang, Ruijie Zhou, Jiexi Wu, Zhixin Pan, Zhaohui Wang, Xiaojuan Tang, Wenjie Pei, Tongxuan Liu, Di yin, Xing Sun, Muhan Zhang 3/31/2026

HISA: Efficient Hierarchical Indexing for Fine-Grained Sparse Attention

HISA improves efficiency of token-level sparse attention mechanisms through hierarchical indexing, reducing O(L²) bottleneck.

Ax Yash Savani, Branislav Kveton, Yuchen Liu, Yilin Wang, Jing Shi, Subhojyoti Mukherjee, Nikos Vlassis, Krishna Kumar Singh 3/31/2026

Stepwise Credit Assignment for GRPO on Flow-Matching Models

Stepwise credit assignment method for GRPO on flow models that differentiates early composition steps from late detail-refinement steps.

Ax Ikechukwu Uchendu, Swati Goel, Karly Hou, Ebrahim Songhori, Kuang-Huei Lee, Joe Wenjie Jiang, Vijay Janapa Reddi, Vincent Zhuang 3/31/2026

See it to Place it: Evolving Macro Placements with Vision-Language Models

VeoPlace uses vision-language models for chip floorplanning macro placement by leveraging VLM spatial reasoning abilities to complement learning-based approaches.

Ax Aur Shalev Merin 3/31/2026

Temporal Credit Is Free

Research on recurrent network training using temporal credit through hidden states without Jacobian propagation, addressing gradient normalization in online adaptation.

Ax Yadi Cao, Sicheng Lai, Jiahe Huang, Yang Zhang, Zach Lawrence, Rohan Bhakta, Izzy F. Thomas, Mingyun Cao, Chung-Hao Tsai, Zihao Zhou, Yidong Zhao, Hao Liu, Alessandro Marinoni, Alexey Arefiev, Rose Yu 3/31/2026

SimulCost: A Cost-Aware Benchmark and Toolkit for Automating Physics Simulations with LLMs

SimulCost benchmark evaluates LLM agents on physics simulation tasks with cost-aware metrics, accounting for simulation time and experimental resource usage beyond token costs.

Ax Nathan McDonald, Colyn Seeley, Christian Brazeau 3/31/2026

Robot Arm Control via Cognitive Map Learners

Application of cognitive map learners for hierarchical, compositional robot arm control without task-specific retraining.