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  • University of Chinese Academy of Sciences

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SijiaCui/README.md

Sijia Cui (崔斯佳)

Ph.D. Candidate · LLM Post-Training & Reinforcement Learning

Institute of Automation, Chinese Academy of Sciences
The Key Laboratory of Cognition and Decision Intelligence for Complex Systems

Email GitHub Location

🎯 Expected graduation: June 2027 — seeking full-time roles in LLM post-training / RL / agents.


👋 About Me

I work on making large models reason and act better through post-training. My research spans reinforcement learning for LLMs, RLVR, process-level verification, and LLM agents — with a bias toward ideas that survive contact with production-scale training.

Currently focused on RL post-training at scale — building unified reward systems, multi-teacher on-policy distillation, and data recycling pipelines for large-scale LLMs.

Most recently a research intern in the RLHF team at Qwen (Alibaba), led by Pengyu Cheng, working on agentic & RL training of LLMs — contrastive RLVR, LLM self-play, and multi-teacher OPD. Previously at Zhipu AI, building real-user function-calling benchmarks and agent post-training with VERL.


🔬 Research Interests

  • LLM Post-Training — RLHF / RLVR, reward modeling, policy optimization
  • Reinforcement Learning — GRPO-family algorithms, sample efficiency, multi-task reward design
  • LLM Agents — tool use / function calling, memory, planning, multi-agent games
  • Test-Time Reasoning — process verification, verifier-guided sampling

🛠️ Skills

Post-Training  VERL SLIME RLHF Reward MOPD

LLM Agents  Function Calling Memory Skills Planning

Frameworks  PyTorch Transformers Ray vLLM

Languages & Tools  Python C++ Java Shell Docker SQL Git


Pinned Loading

  1. Qwen-Applications/CLIPO Qwen-Applications/CLIPO Public

    CLIPO: Contrastive Learning in Policy Optimization Generalizes RLVR

    Python 22 2

  2. AI-Research-TeamX/SEER AI-Research-TeamX/SEER Public

    [EMNLP 2025] Self-Guided Function Calling in Large Language Models via Stepwise Experience Recall

    HTML 11

  3. AI-Research-TeamX/PLAP AI-Research-TeamX/PLAP Public

    [IJCNN 2025] Empowering LLMs with Parameterized Skills for Adversarial Long-Horizon Planning

    Java 5 1

  4. play-urts play-urts Public

    [IJCNN 2025] Empowering LLMs with Parameterized Skills for Adversarial Long-Horizon Planning

    Java 15

  5. AI-Research-TeamX/BETA AI-Research-TeamX/BETA Public

    Python 5