Chengxi Li
Member of Technical Staff, Fireworks AI — post-training infrastructure & agentic RL for LLMs.
BasedBay Area
LinkedInchengxi-li X@chengxilics GitHub@Hecate0821
EducationCMU M.S. · Xidian B.Eng.
Chengxi Li
2025 · Jun — Dec

SGLang RL Team — Contributor (slime · SGLang)

Open-source contributor for RL systems.
Remote
2026 · Sep

Agentic RL Needs Exact Token Trajectories

An interactive slide deck on Token-In / Token-Out, multi-turn drift, safe divergence, and black-box agent RL.
Agentic RL · TITO
2026 · May

The Load-Balance Problem Behind Hybrid Parallelism

A compact note on Megatron Dynamic-CP, ByteScale Hybrid Data Parallelism, and why DP, CP, and PP become coupled when sequence lengths vary.
DP · CP · PP
2026 · Oct

Scouter: MoE Train / Inference Roofline

An interactive model of post-training, inference and RL for MoE models: per-module attention and MLP rooflines across architectures, parallelism, low precision and speculative decoding on one shared engine, checked against measured and public data points.
Train · Infer · RL
LLM Post-Training Agentic RL