In this study, we present a tensor--train framework for nonintrusive operator inference aimed at learning discrete operators and using them to predict solutions of physical governing equations. Our framework comprises three approaches: full--order tensor--train operator inference, full--order quantized tensor--train operator inference, and reduced--order tensor--train operator inference. In each case, snapshot data is represented in tensor--train format--either through compression or cross interpolation--enabling the efficient handling of extremely large datasets with significantly reduced computational effort compared to standard methods. The effectiveness of each approach is demonstrated through numerical experiments related to Computational Fluid Dynamics and benchmarked against the standard reduced--order operator inference method, highlighting the advantages of the tensor--train representations in both accuracy and scalability.
Variational Bayesian Inference for Tensor Robust Principal Component Analysis
Department of Statistics and Data Science, Southern University of Science and Technology（统计与数据科学系，南方科技大学）；Lingnan University（岭南大学）；Key Laboratory of Computing and Stochastic Mathematics (LCSM), School of Mathematics and Statistics, Hunan Normal University（计算与随机数学重点实验室（LCSM），数学与统计学学院，湖南师范大学）
Universität Tübingen（蒂宾根大学）；Skolkovo Institute of Science and Technology（斯科尔科沃科学技术研究所）；Institute of Numerical Mathematics（计算数学研究所）；Princeton University（普林斯顿大学）
National Research University Higher School of Economics（国立高等经济大学）；Institute of Numerical Mathematics RAS（俄罗斯科学院计算数学研究所）；Cornell University（康奈尔大学）；Skolkovo Institute of Science and Technology（斯科尔科沃科学技术学院）
Fast and Accurate Tensor Completion with Total Variation Regularized Tensor Trains
Department of Electrical and Electronic Engineering, The University of Hong Kong（香港大学电子工程系）；Delft Center for Systems and Control, Delft University of Technology（代尔夫特理工大学系统与控制中心）
Tensor Networks for Latent Variable Analysis. Part I: Algorithms for Tensor Train Decomposition
Brain Science Institute, RIKEN（RIKEN脑科学研究所）；Systems Research Institute PAS（波兰科学院系统研究所）；University of Bonn（波恩大学）；Institute of Information Theory and Automation（信息与自动化研究所）；Georgetown University（乔治城大学）；Imperial College（帝国理工学院）
Completion of High Order Tensor Data with Missing Entries via Tensor-train Decomposition
Saitama Institute of Technology（埼玉工业大学）；RIKEN Center for Advanced Intelligence Project (AIP)（理化学研究所先进智能项目中心（AIP））；Guangdong University of Technology（广东工业大学）
High-order Tensor Completion for Data Recovery via Sparse Tensor-train Optimization
Graduate School of Engineering, Saitama Institute of Technology, Japan（埼玉工科大学工学研究科）；Tensor Learning Unit, RIKEN Center for Advanced Intelligence Project (AIP), Japan（日本先进情报项目（AIP）RIKEN智能学习单元）；School of Automation, Guangdong University of Technology, China（广东技术大学自动化学院）；School of Computer Science and Technology, Hangzhou Dianzi University, China（杭州电子科技大学计算机科学与技术学院）
High-dimension Tensor Completion via Gradient-based Optimization Under Tensor-train Format
Graduate School of Engineering, Saitama Institute of Technology, Japan（日本埼玉科技大学工学研究科）；Tensor Learning Unit, RIKEN Center for Advanced Intelligence Project (AIP), Japan（日本RIKEN先进人工智能项目（AIP）张量学习单元）；School of Automation, Guangdong University of Technology, China（广东技术大学自动化学院）；School of Computer Science and Technology, Hangzhou Dianzi University, China（杭州电子科技大学计算机科学与技术学院）
