Author

Xinyuan Song

h-index 3 View on Semantic Scholar

We have 2 of 7 papers

We haven’t gathered this author’s papers yet. Follow them and we’ll fetch their work.

Not the right person? Other researchers publish under this name.

#machine learning Feb 2026

ActTail: Global Activation Sparsity in Large Language Models

ActTail is proposed, a TopK magnitude-based activation sparsity method with global activation sparsity allocation grounded in Heavy-Tailed Self-Regularization (HT-SR) theory that improves both perplexity and downstream task performance at high sparsity compared to uniform allocation.

Wen-Wen Hou, Xin-Yuan Song, Wen-Qian Weng et al. · arXiv.org · 2 citations

Jul 2026

ISO: An RLVR-Native Optimization Stack

Reinforcement learning with verifiable rewards (RLVR) is rapidly advancing the reasoning capabilities of language models, yet the optimization layer that converts reward feedback into weight-space updates remains poorly understood. Building on our prior analysis (Zhu et al., 2025), we study this missing layer through t...

Hanqing Zhu, Wenyan Cong, Zhizhou Sha et al. · arXiv.org · 0 citations