Jiaqi Ma | 马家祺

Postdoctoral Fellow
Harvard Business School, Harvard University
Adjunct Assistant Professor
School of Information Sciences, University of Illinois Urbana-Champaign

Contact:
jiaqima AT illinois DOT edu (Outlook)
jiaqima.mle AT gmail DOT com
[Google Scholar | Github | Mastodon | Twitter]

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About Me

I am currently a Postdoctoral Fellow at Harvard University working with Prof. Hima Lakkaraju. In Fall 2023, I will start as an Assistant Professor in the School of Information Sciences, University of Illinois Urbana-Champaign. I received my Ph.D. from University of Michigan and a B.Eng. from Tsinghua University.

I’m generally interested in understanding and improving machine learning (ML) for complex real-world data (e.g., graphs, rankings, partially observed data), under different contexts (e.g., distribution shift), from various aspects (e.g., accuracy, efficiency, robustness, fairness). I’m particularly interested in scenarios where humans are involved. Some “buzzwords” relevant to my existing research include graph ML, trustworthy ML, and recommender systems. I’m also dipping into explainable ML and NLP.

I have openings for Ph.D. students starting in Fall 2023. Please see here for more details.

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News

• One paper on evaluating chemical space coverage metrics accepted by ICLR 2023!
• One paper (GLI) accepted as Oral by LOG 2022!

• Two papers accepted by WSDM 2022!

• One paper (SODEN) accepted by JMLR!

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Selected Papers

Preprints

• Towards Bridging the Gaps between the Right to Explanation and the Right to be Forgotten.
  Satyapriya Krishna*, Jiaqi Ma*, Himabindu Lakkaraju.
  [ArXiv]

Conference Publications

• How Much Space Has Been Explored? Measuring the Chemical Space Covered by Databases and Machine-Generated Molecules.
  Yutong Xie, Ziqiao Xu, Jiaqi Ma, Qiaozhu Mei.
  ICLR 2023.
  [OpenReview]
• Graph Learning Indexer: A Contributor-Friendly and Metadata-Rich Platform for Graph Learning Benchmarks.
  Jiaqi Ma*, Xingjian Zhang*, Hezheng Fan, Jin Huang, Tianyue Li, Ting Wei Li, Yiwen Tu, Chenshu Zhu, Qiaozhu Mei.
  LOG 2022 (Oral).
  [OpenReview][Codebase][Documentation]
• Fast Learning of MNL Model From General Partial Rankings with Application to Network Formation Modeling.
  Jiaqi Ma*, Xingjian Zhang*, Qiaozhu Mei.
  WSDM 2022.
  [ArXiv][Code]
• Adversarial Attack on Graph Neural Networks as An Influence Maximization Problem.
  Jiaqi Ma*, Junwei Deng*, Qiaozhu Mei.
  WSDM 2022.
  [ArXiv][Code]
• Subgroup Generalization and Fairness of Graph Neural Networks.
  Jiaqi Ma*, Junwei Deng*, Qiaozhu Mei.
  NeurIPS 2021 (Spotlight, top 3%).
  [ArXiv][Code]
• Learning-to-Rank with Partitioned Preference: Fast Estimation for the Plackett-Luce Model.
  Jiaqi Ma, Xinyang Yi, Weijing Tang, Zhe Zhao, Lichan Hong, Ed H. Chi, Qiaozhu Mei.
  AISTATS 2021.
  [ArXiv][SlidesLive]
• CopulaGNN: Towards Integrating Representational and Correlational Roles of Graphs in Graph Neural Networks.
  Jiaqi Ma, Bo Chang, Xuefei Zhang, Qiaozhu Mei.
  ICLR 2021.
  [ArXiv][OpenReview][Code][SlidesLive]
• Towards More Practical Adversarial Attacks on Graph Neural Networks.
  Jiaqi Ma*, Shuangrui Ding*, Qiaozhu Mei.
  NeurIPS 2020.
  [ArXiv][Code][SlidesLive]
• Off-policy Learning in Two-stage Recommender Systems.
  Jiaqi Ma, Zhe Zhao, Xinyang Yi, Ji Yang, Minmin Chen, Jiaxi Tang, Lichan Hong, Ed H. Chi.
  TheWebConf (WWW) 2020 (with oral presentation).
  [Proceedings][Code]
• A Flexible Generative Framework for Graph-based Semi-supervised Learning.
  Jiaqi Ma*, Weijing Tang*, Ji Zhu, Qiaozhu Mei.
  NeurIPS 2019.
  [Proceedings][Code]
• SNR: Sub-Network Routing for Flexible Parameter Sharing in Multi-task Learning.
  Jiaqi Ma, Zhe Zhao, Jilin Chen, Ang Li, Lichan Hong, Ed H. Chi.
  AAAI 2019.
  [Proceedings]
• Modeling Task Relationships in Multi-task Learning with Multi-gate Mixture-of-Experts.
  Jiaqi Ma, Zhe Zhao, Xinyang Yi, Jilin Chen, Lichan Hong, Ed H. Chi.
  KDD 2018 (with oral presentation).
  [Proceedings][Video][Presentation]
• DeepCas: An End-to-End Predictor of Information Cascades.
  Cheng Li, Jiaqi Ma, Xiaoxiao Guo, Qiaozhu Mei.
  WWW 2017.
  [Proceedings][Code]

Journal Publications

• SODEN: A Scalable Continuous-Time Survival Model through Ordinary Differential Equation Networks.
  Weijing Tang*, Jiaqi Ma*, Qiaozhu Mei, Ji Zhu.
  JMLR. 2022.
  [ArXiv][Code]
• Semi-Supervised Joint Learning for Longitudinal Clinical Events Classification Using Neural Network Models.
  Weijing Tang, Jiaqi Ma, Akbar K. Waljee, Ji Zhu.
  Stat. 2020.
  [Paper]

(* Equal Contribution)

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Teaching

• Teaching Fellow, COMPSCI 282BR, Spring 2023, Harvard University.
  Topics in Machine Learning: Interpretability and Explainability.

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Misc

Pronunciation of my first name: Jia-Chi.