Jiin Woo

Carnegie Mellon University, Pittsburgh, PA, USA
Email: jiinw [at] andrew [dot] cmu [dot] edu
LinkedIn / Google Scholar

---

I am a fourth-year PhD student in Electrical and Computer Engineering department at Carnegie Mellon University (CMU), fortunate to be advised by Yuejie Chi and Gauri Joshi. Before coming to CMU, I was a machine learning engineer at NAVER Search. Previously, I received my MS in Electrical Engineering (advised by Yung Yi) and BS in Mathematical Sciences at Korea Advanced Institute of Science and Technology (KAIST).

My research interests lie in reinforcement learning, federated learning, and statistical inference.

---

Selected Publications/Preprints

Reinforcement Learning

• Federated Offline Reinforcement Learning: Collaborative Single-Policy Coverage Suffices
  Jiin Woo, Laixi Shi, Gauri Joshi, Yuejie Chi
  ICML, 2024
  [arxiv]

• The Blessing of Heterogeneity in Federated Q-Learning: Linear Speedup and Beyond
  Jiin Woo, Gauri Joshi, Yuejie Chi
  ICML, 2023
  [arxiv][slides]

Statistical Inference with Social Network Data

• Iterative Learning of Graph Connectivity from Partially‑Observed Cascade Samples
  Jiin Woo, Jungseul Ok, Yung Yi
  ACM MobiHoc, 2020
  [paper]

• Information Source Finding in Networks: Querying With Budgets
  Jaeyoung Choi, Sangwoo Moon, Jiin Woo, KyungHwan Son, Jinwoo Shin, Yung Yi
  IEEE/ACM Transactions on Networking, 2020
  [paper]

• Rumor Source Detection under Querying with Untruthful Answers
  Jaeyoung Choi, Sangwoo Moon, Jiin Woo, KyungHwan Son, Jinwoo Shin, Yung Yi
  IEEE INFOCOM, 2017
  [paper]

---

Work Experience

• Amazon (Central Machine Learning)
  Applied Scientist Intern, Seattle, WA, USA, May 2024 - Aug 2024
  • LLM-enhanced RL for recommendation systems
• NAVER Corp. (Search)
  Machine Learning Engineer, Seongnam, Korea, Sep 2018 - Aug 2021
  • Long-tail search query analysis
  • User search behavior/intent analysis
  • Personalized keyword recommendation

---

Awards & Scholarships

• Hsu Chang Memorial Fellowship (2022-2023)
• Carnegie Institute of Technology Dean’s Fellowship (2021-2022)
• KAIST Support Scholarship (2016-2018)
• Excellence Award in Creative Challenge Type SW R&D Program (2015)
• The National Scholarship for Science and Engineering (2011-2015)

---