I am a second-year graduate student at the School of Software & Microelectronics, Peking University (PKU), advised by Assistant Professor Lei Ma (马雷). I received my bachelor's degree from the School of Electronics Engineering and Computer Science (EECS), PKU (2021–2025).

Research Interests

LLM Self-Distillation Reinforcement Learning Post-Training

Previous Research

Spike Camera Reconstruction

Publications

CAST: Non-Privileged Clipped Asymmetric Self-Teaching with Advantage Flipping for GRPO

Yang Li, Gongle Xue, Yijia Guo, Yuheng Yuan, Liwen Hu, Lei Ma

arXiv preprint, 2026

We propose CAST, an answer-free self-distillation method for GRPO-style RLVR that shapes token-level advantages according to trajectory correctness.

Splats in Splats: Robust and Effective 3D Steganography towards Gaussian Splatting

Yijia Guo, Wenkai Huang, Yang Li, Gaolei Li, Hang Zhang, Liwen Hu, Jianhua Li, Tiejun Huang, Lei Ma

AAAI 2026

We propose splats in splats, the first 3DGS steganography framework that embeds 3D content in 3DGS itself without modifying any attributes, via importance-graded SH coefficient encryption and autoencoder-assisted opacity mapping.

Seeing the Unseen in Low-light Spike Streams

Liwen Hu, Yang Li, Mianzhi Liu, Yijia Guo, Shenghao Xie, Ziluo Ding, Tiejun Huang, Lei Ma

ECCV 2026

We propose Diff-SPK, a diffusion-based reconstruction method that leverages generative priors to recover high-quality images from low-light spike streams.

Contact

Feel free to reach out via email: ly0376@stu.pku.edu.cn