Junyi Chen 陈俊一

Master Student in SJTU

⌖ Shanghai, China

Junyi Chen in Budapest

I am a master's student in Computer Science at Shanghai Jiao Tong University, advised by Prof. Fan Wu and Prof. Shengzhong Liu in NNE-Lab.

My research focuses on efficient AI, LLM post-training and inference, reinforcement learning systems, and machine learning systems.

News

  • 🎉 Our SmartThinker has been accepted by ICML 2026!
  • 🎉 Our StructureBench has been accepted by IJCAI 2026!
  • 🎉 Our C²KV has been accepted by KDD 2026!
  • 🏆 Honored to receive the SenseTime Rising Star Intern Award!
  • 🎉 Our TokenFlow has been accepted by EuroSys 2026!
  • 🏆 Grateful to receive the National Scholarship for graduate students!
  • 🏆 Our Pre³ received an Outstanding Paper Award at ACL 2025!
  • 🎉 Our Pre³ has been accepted to ACL 2025 as an oral presentation!

Publications

Switch between selected cards and the complete paper list

TokenFlow: Responsive LLM Text Streaming Serving under Request Burst via Preemptive Scheduling

EuroSys 2026

Junyi Chen , Chuheng Du, Renyuan Liu, Shuochao Yao, Dingtian Yan, Jiang Liao, Shengzhong Liu, Fan Wu, Guihai Chen

Pre³: Enabling Deterministic Pushdown Automata for Faster Structured LLM Generation

ACL 2025 Oral · 218/1,699 (12.8%) 🏆 Outstanding Paper · Top 2.5%

Junyi Chen , Shihao Bai, Zaijun Wang, Siyu Wu, Chuheng Du, Hailong Yang, Ruihao Gong, Shengzhong Liu, Fan Wu, Guihai Chen

C²KV: Compressed and Composable KV Cache Reuse for Efficient LLM Inference

KDD 2026

Chuheng Du, Junyi Chen , Hanlin Tang, Kan Liu, Lan Tao, Lin Qu, Chaoyue Niu, Shengzhong Liu, Guihai Chen, Fan Wu

SmartThinker: Progressive Chain-of-Thought Length Calibration for Efficient Large Language Model Reasoning

ICML 2026

Chenzhi Hu, Qinzhe Hu, Yuhang Xu, Junyi Chen , Ruijie Wang, Shengzhong Liu, Jianxin Li, Fan Wu, Guihai Chen

Open-Source Projects

LightLLM logo from the official repository README

LightLLM

LightLLM GitHub star count

A Python-based LLM inference and serving framework for high-throughput, low-latency deployment, with distributed serving and an efficient runtime architecture.

  • Python
  • LLM Serving
  • Distributed Systems
Relax six-layer architecture from the official repository README

Relax

Relax GitHub star count

An asynchronous reinforcement learning engine for omni-modal post-training at scale, with service-oriented orchestration and decoupled training and inference built on Ray Serve, Megatron-LM, and SGLang.

  • Reinforcement Learning
  • Distributed Systems
  • LLM Infrastructure

Invited Talks

Awards

Education

Shanghai Jiao Tong University

M.S. in Computer Science · NNE-Lab

Advised by Prof. Fan Wu and Prof. Shengzhong Liu. GPA: 3.95/4.0.

Beihang University

B.S. in Computer Science · Shen Yuan Honors College

Top 5% honors program. GPA: 3.92/4.0; rank: 1/50.

Experience

SenseTime Research

Research Intern · Large Model Systems and Toolchain Team

Designed buffer-aware preemptive scheduling for responsive LLM serving, developed grammar-constrained structured decoding, and explored confidence-based dynamic speculative decoding for multi-token prediction.