About

I study AI Infra, LLMs, reinforcement learning, and AI agents. Contributor to open source projects including vLLM, SGLang, TRL, VERL, CrewAI, FastMCP, PaddlePaddle, etc.

Selected Work

  • PayPal Cosmos.AI Platform
    An enterprise AI/ML platform serving billions of daily inference requests.
    blogpost

  • Adaptive-Boundary-Clipping GRPO: Ensuring Bounded Ratios for Stable and Generalizable Training
    Chi Liu, Xin Chen
    paper | repo

  • Rethinking GSPO: The Perplexity-Entropy Equivalence
    Chi Liu
    paper

  • Fraud Detection Through Large-Scale Graph Clustering with Heterogeneous Link Transformation
    Chi Liu
    paper

  • Container image processing method and apparatus, and non-transitory computer-readable storage medium
    US Patent US11880341B2
    patent

  • Method, device, equipment and medium for realizing joint modeling
    CN Patent CN113326367A
    patent

  • Operating environment acquisition method, device and electronic device
    CN Patent CN110908675A
    patent

Public Talks

Blog Posts

Check out my blog for technical articles and thoughts.

(last updated: Jan 2026)