collaborators

9 papers

cs.LG2026

MISA: Mixture of Indexer Sparse Attention for Long-Context LLM Inference

Ruijie Zhou, Fanxu Meng, Yufei Xu +4

DeepSeek Sparse Attention (DSA) sets the state of the art for fine-grained inference-time sparse attention by introducing a learned token-wise indexer that scores every prefix toke…

cs.CL2026

Feedback-Driven Tool-Use Improvements in Large Language Models via Automated Build Environments

Junjie Ye, Changhao Jiang, Zhengyin Du +8

Effective tool use is essential for large language models (LLMs) to interact with their environment. However, progress is limited by the lack of efficient reinforcement learning (R…

cs.LG2026

HISA: Efficient Hierarchical Indexing for Fine-Grained Sparse Attention

Yufei Xu, Fanxu Meng, Fan Jiang +11

Token-level sparse attention mechanisms, exemplified by DeepSeek Sparse Attention (DSA), achieve fine-grained key selection by scoring every historical key for each query through a…

cs.LG2026

Generalizable End-to-End Tool-Use RL with Synthetic CodeGym

Weihua Du, Hailei Gong, Zhan Ling +7

Tool-augmented large language models (LLMs), hereafter LLM agents, leverage external tools to solve diverse tasks and interface with the real world. However, current training pract…

cs.AI2025

Recitation over Reasoning: How Cutting-Edge Language Models Can Fail on Elementary School-Level Reasoning Problems?

Kai Yan, Yufei Xu, Zhengyin Du +4

The rapid escalation from elementary school-level to frontier problems of the difficulty for LLM benchmarks in recent years have weaved a miracle for researchers that we are only i…

cs.CL2025

Critique-RL: Training Language Models for Critiquing through Two-Stage Reinforcement Learning

Zhiheng Xi, Jixuan Huang, Xin Guo +15

Training critiquing language models to assess and provide feedback on model outputs is a promising way to improve LLMs for complex reasoning tasks. However, existing approaches typ…