Jiequn Han (韩劼群)

Research Scientist
Center for Computational Mathematics
Flatiron Institute

162 5th Avenue
New York, NY 10010
Email: jhan (at) flatironinstitute (dot) org


About Me

I am a Research Scientist at the Center for Computational Mathematics, Flatiron Institute. Previously, I worked as an Instructor of Mathematics at the Department of Mathematics, Princeton University. I obtained my Ph.D. degree in applied mathematics from the Program in Applied and Computational Mathematics (PACM), Princeton University in June 2018, advised by Prof. Weinan E. Before that, I received my Bachelor degree from the School of Mathematical Sciences, Peking University in July 2013.

I conduct research on machine learning for science, drawing inspiration from various scientific disciplines and focusing on solving high-dimensional problems in scientific computing. My current research interests mainly focus on solving high-dimensional partial differential equations and machine learning based-multiscale modeling. I did a research internship in DeepMind during the summer of 2017, under the mentorship of Thore Graepel.

Here are my CV and some links: Google Scholar profile, ResearchGate profile, Twitter.



  1. Posterior sampling with denoising oracles via tilted transport,
    Joan Bruna, Jiequn Han,
    arXiv preprint, (2024). [arXiv]

  2. Neural operator-based super-fidelity: A warm-start approach for accelerating steady-state simulations,
    Xu-Hui Zhou, Jiequn Han, Muhammad I. Zafar, Christopher J. Roy, Heng Xiao,
    arXiv preprint, (2023). [arXiv]

  3. Stochastic optimal control matching,
    Carles Domingo-Enrich, Jiequn Han, Brandon Amos, Joan Bruna, Ricky T. Q. Chen,
    arXiv preprint, (2023). [arXiv] [code]

  4. Learning free terminal time optimal closed-loop control of manipulators,
    Wei Hu, Yue Zhao, Weinan E, Jiequn Han, Jihao Long,
    arXiv preprint, (2023). [arXiv] [webpage]

  5. Initial value problem enhanced sampling for closed-loop optimal control design with deep neural networks,
    Xuanxi Zhang, Jihao Long, Wei Hu, Weinan E, Jiequn Han,
    arXiv preprint, (2022). [arXiv]

  6. DeepHAM: A global solution method for heterogeneous agent models with aggregate shocks,
    Jiequn Han, Yucheng Yang, Weinan E,
    arXiv preprint, (2021). [arXiv] [SSRN] [slides]


  1. Offline supervised learning vs. online direct policy optimization: A comparative study and a unified training paradigm for neural network-based optimal feedback control,
    Yue Zhao, Jiequn Han,
    Physica D: Nonlinear Phenomena, 462, 134130 (2024). [journal] [arXiv] [code]

  2. Escaping saddle points efficiently with occupation-time-adapted perturbations,
    Xin Guo, Jiequn Han, Mahan Tajrobehkar, Wenpin Tang,
    Journal of Computational Mathematics and Data Science, 10, 100090 (2024). [journal] [arXiv]

  3. Learning high-dimensional McKean-Vlasov forward-backward stochastic differential equations with general distribution dependence,
    Jiequn Han, Ruimeng Hu, Jihao Long,
    SIAM Journal on Numerical Analysis, 62(1), 1–24 (2024). [journal] [arXiv] [code]

  4. Deep reinforcement learning in finite-horizon to explore the most probable transition pathway,
    Jin Guo, Ting Gao, Peng Zhang, Jiequn Han, Jinqiao Duan,
    Physica D: Nonlinear Phenomena, 458, 133955 (2024). [journal]

  5. A class of dimensionality-free metrics for the convergence of empirical measures,
    Jiequn Han, Ruimeng Hu, Jihao Long,
    Stochastic Processes and their Applications, 164, 242–287 (2023). [journal] [arXiv]

  6. DeePMD-kit v2: A software package for Deep Potential models,
    Jinzhe Zeng, Duo Zhang, and 45 others, including Jiequn Han,
    Journal of Chemical Physics, 159, 054801 (2023). [journal] [arXiv] [code]

  7. Reinforcement learning with function approximation: from linear to nonlinear,
    Jihao Long, Jiequn Han,
    Journal of Machine Learning, 2(3), 161–193 (2023). [journal] [arXiv]

  8. A neural network warm-start approach for the inverse acoustic obstacle scattering problem,
    Mo Zhou, Jiequn Han, Manas Rachh, Carlos Borges,
    Journal of Computational Physics, 490, 112341 (2023). [journal] [arXiv] [code]

  9. Improving gradient computation for differentiable physics simulation with contacts,
    Yaofeng Desmond Zhong, Jiequn Han, Biswadip Dey, Georgia Olympia Brikis,
    Learning for Dynamics and Control Conference (L4DC), (2023). [proceedings] [arXiv] [blog] [code]

  10. An equivariant neural operator for developing nonlocal tensorial constitutive models,
    Jiequn Han, Xu-Hui Zhou, Heng Xiao,
    Journal of Computational Physics, 488, 112243 (2023). [journal] [arXiv] [post on NASA TMR]

  11. Dynamical systems and optimal control approach to deep learning,
    Weinan E, Jiequn Han, Qianxiao Li,
    Mathematical Aspects of Deep Learning, Cambridge University Press, 422–438 (2022). [book chapter]

  12. A PDE-free, neural network-based eddy viscosity model coupled with RANS equations,
    Ruiying Xu, Xu-Hui Zhou, Jiequn Han, Richard P. Dwight, Heng Xiao,
    International Journal of Heat and Fluid Flow, 98, 109051 (2022). [journal] [arXiv]

  13. Empowering optimal control with machine learning: A perspective from model predictive control,
    Weinan E, Jiequn Han, Jihao Long,
    International Symposium on Mathematical Theory of Networks and Systems (MTNS), (2022). [journal] [arXiv]

  14. Pandemic control, game theory and machine learning,
    Yao Xuan, Robert Balkin, Jiequn Han, Ruimeng Hu, Hector D Ceniceros,
    Notices of the American Mathematical Society, 69(11), 1878–1887 (2022). [journal] [arXiv]

  15. A machine learning enhanced algorithm for the optimal landing problem,
    Yaohua Zang, Jihao Long, Xuanxi Zhang, Wei Hu, Weinan E, Jiequn Han
    Mathematical and Scientific Machine Learning Conference (MSML), (2022). [proceedings] [arXiv]

  16. Frame invariance and scalability of neural operators for partial differential equations,
    Muhammad I. Zafar, Jiequn Han, Xu-Hui Zhou, Heng Xiao,
    Communications in Computational Physics, 32, 336–363 (2022). [journal] [arXiv]

  17. Neural-network quantum states for periodic systems in continuous space,
    Gabriel Pescia, Jiequn Han, Alessandro Lovato, Jianfeng Lu, Giuseppe Carleo,
    Physical Review Research, 4, 023138 (2022). [journal] [arXiv]

  18. Convergence of deep fictitious play for stochastic differential games,
    Jiequn Han, Ruimeng Hu, Jihao Long,
    Frontiers of Mathematical Finance, 1(2), 287–319 (2022). [journal] [arXiv]

  19. Perturbational complexity by distribution mismatch: A systematic analysis of reinforcement learning in reproducing kernel Hilbert space,
    Jihao Long, Jiequn Han,
    Journal of Machine Learning, 1(1), 1–37 (2022). [journal] [arXiv] [slides]

  20. Universal approximation of symmetric and anti-symmetric functions,
    Jiequn Han, Yingzhou Li, Lin Lin, Jianfeng Lu, Jiefu Zhang, Linfeng Zhang,
    Communications in Mathematical Sciences, 20(5), 1397–1408 (2022). [journal] [arXiv]

  21. An L2 analysis of reinforcement learning in high dimensions with kernel and neural network approximation,
    Jihao Long, Jiequn Han, Weinan E,
    CSIAM Transactions on Applied Mathematics, 3(2), 191–220 (2002). [journal] [arXiv]

  22. Approximation and optimization theory for linear continuous-time recurrent neural networks,
    Zhong Li, Jiequn Han, Weinan E, Qianxiao Li,
    Journal of Machine Learning Research, 23(42), 1–85 (2022). [journal]

  23. Algorithms for solving high dimensional PDEs: from nonlinear Monte Carlo to machine learning,
    Weinan E, Jiequn Han, Arnulf Jentzen,
    Nonlinearity, 35(1), 278–310 (2022). [journal] [arXiv] [website]

  24. Frame-independent vector-cloud neural network for nonlocal constitutive modelling on arbitrary grids,
    Xu-Hui Zhou, Jiequn Han, Heng Xiao,
    Computer Methods in Applied Mechanics and Engineering, 388, 114211 (2022). [journal] [arXiv] [code]

  25. Income and wealth distribution in macroeconomics: A continuous-time approach,
    Yves Achdou, Jiequn Han, Jean-Michel Lasry, Pierre-Louis Lions, Benjamin Moll,
    The Review of Economic Studies, 89(1), 45–86 (2022). [journal] [NBER]

  26. Actor-critic method for high dimensional static Hamilton–Jacobi–Bellman partial differential equations based on neural networks,
    Mo Zhou, Jiequn Han, Jianfeng Lu,
    SIAM Journal on Scientific Computing, 43(6), A4043–A4066 (2021). [journal] [arXiv] [code]

  27. Optimal policies for a pandemic: A stochastic game approach and a deep learning algorithm,
    Yao Xuan, Robert Balkin, Jiequn Han, Ruimeng Hu, Hector D Ceniceros,
    Mathematical and Scientific Machine Learning Conference (MSML), (2021). [proceedings] [arXiv]

  28. Recurrent neural networks for stochastic control problems with delay,
    Jiequn Han, Ruimeng Hu,
    Mathematics of Control, Signals, and Systems, 33, 775–795 (2021). [journal] [arXiv] [code]

  29. Global convergence of policy gradient for linear-quadratic mean-field control/game in continuous time,
    Weichen Wang, Jiequn Han, Zhuoran Yang, Zhaoran Wang,
    International Conference on Machine Learning (ICML), (2021). [proceedings] [arXiv]

  30. Learning nonlocal constitutive models with neural networks,
    Xu-Hui Zhou, Jiequn Han, Heng Xiao,
    Computer Methods in Applied Mechanics and Engineering, 384, 113927 (2021). [journal] [arXiv] [code]

  31. Machine-learning-assisted modeling,
    Weinan E, Jiequn Han, Linfeng Zhang,
    Physics Today, 74, 7, 36 (2021). [journal] [an early and long version on arXiv]

  32. On the curse of memory in recurrent neural networks: approximation and optimization analysis,
    Zhong Li, Jiequn Han, Weinan E, Qianxiao Li,
    International Conference on Learning Representations (ICLR), (2021). [OpenReview]

  33. Machine learning moment closures for accurate and efficient simulation of polydisperse evaporating sprays,
    James B. Scoggins, Jiequn Han, Marc Massot,
    AIAA Scitech 2021 Forum, 1786 (2021). [proceedings]

  34. Solving high-dimensional eigenvalue problems using deep neural networks: A diffusion Monte Carlo like approach,
    Jiequn Han, Jianfeng Lu, Mo Zhou,
    Journal of Computational Physics, 423, 109792 (2020). [journal] [arXiv] [code]

  35. Deep fictitious play for finding Markovian Nash equilibrium in multi-agent games,
    Jiequn Han, Ruimeng Hu,
    Mathematical and Scientific Machine Learning Conferenc (MSML), (2020). [proceedings] [arXiv]

  36. Convergence of the deep BSDE method for coupled FBSDEs,
    Jiequn Han, Jihao Long,
    Probability, Uncertainty and Quantitative Risk, 5(1), 1–33 (2020). [journal] [arXiv]

  37. Uniformly accurate machine learning-based hydrodynamic models for kinetic equations,
    Jiequn Han, Chao Ma, Zheng Ma, Weinan E,
    Proceedings of the National Academy of Sciences, 116(44) 21983–21991 (2019). [journal] [arXiv]

  38. Solving many-electron Schrödinger equation using deep neural networks,
    Jiequn Han, Linfeng Zhang, Weinan E,
    Journal of Computational Physics, 399, 108929 (2019). [journal] [arXiv]

  39. A mean-field optimal control formulation of deep learning,
    Weinan E, Jiequn Han, Qianxiao Li,
    Research in the Mathematical Sciences, 6:10 (2019). [journal] [arXiv]

  40. End-to-end symmetry preserving inter-atomic potential energy model for finite and extended systems,
    Linfeng Zhang, Jiequn Han, Han Wang, Wissam A. Saidi, Roberto Car, Weinan E,
    Conference on Neural Information Processing Systems (NeurIPS), (2018). [proceedings] [arXiv] [website] [code]

  41. Solving high-dimensional partial differential equations using deep learning,
    Jiequn Han, Arnulf Jentzen, Weinan E,
    Proceedings of the National Academy of Sciences, 115(34), 8505–8510 (2018). [journal] [arXiv] [code]

  42. DeePCG: constructing coarse-grained models via deep neural networks,
    Linfeng Zhang, Jiequn Han, Han Wang, Roberto Car, Weinan E,
    The Journal of Chemical Physics, 149, 034101 (2018). [journal] [arXiv] [website]

  43. DeePMD-kit: A deep learning package for many-body potential energy representation and molecular dynamics,
    Han Wang, Linfeng Zhang, Jiequn Han, Weinan E,
    Computer Physics Communications, 228, 178–184 (2018). [journal] [arXiv] [website] [code]

  44. Deep Potential Molecular Dynamics: a scalable model with the accuracy of quantum mechanics,
    Linfeng Zhang, Han Wang, Jiequn Han, Roberto Car, Weinan E,
    Physical Review Letters 120(10), 143001 (2018). [journal] [arXiv] [website] [code]

  45. Deep Potential: a general representation of a many-body potential energy surface,
    Jiequn Han, Linfeng Zhang, Roberto Car, Weinan E,
    Communications in Computational Physics, 23, 629–639 (2018). [journal] [arXiv] [website]

  46. Deep learning-based numerical methods for high-dimensional parabolic partial differential equations and backward stochastic differential equations,
    Weinan E, Jiequn Han, Arnulf Jentzen,
    Communications in Mathematics and Statistics, 5, 349–380 (2017). [journal] [arXiv] [code]

  47. Deep learning approximation for stochastic control problems,
    Jiequn Han, Weinan E,
    Deep Reinforcement Learning Workshop, NIPS (2016). [arXiv]

  48. From microscopic theory to macroscopic theory: a systematic study on modeling for liquid crystals,
    Jiequn Han, Yi Luo, Zhifei Zhang, Pingwen Zhang,
    Archive for Rational Mechanics and Analysis, 215, 741–809 (2015). [journal] [arXiv]

Mentored Students

I'm open to hosting (remote) undergrad/grad visitors. Feel free to reach out if our research interests intersect in any way.