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Spotlight
Fast Multivariate Spatio-temporal Analysis via Low Rank Tensor Learning
Mohammad Taha Bahadori · Qi (Rose) Yu · Yan Liu

Wed Dec 10 07:10 AM -- 07:30 AM (PST) @ Level 2, room 210
in Spotlight Session 5: Regression and time series spotlights »

Accurate and efficient analysis of multivariate spatio-temporal data is critical in climatology, geology, and sociology applications. Existing models usually assume simple inter-dependence among variables, space, and time, and are computationally expensive. We propose a unified low rank tensor learning framework for multivariate spatio-temporal analysis, which can conveniently incorporate different properties in spatio-temporal data, such as spatial clustering and shared structure among variables. We demonstrate how the general framework can be applied to cokriging and forecasting tasks, and develop an efficient greedy algorithm to solve the resulting optimization problem with convergence guarantee. We conduct experiments on both synthetic datasets and real application datasets to demonstrate that our method is not only significantly faster than existing methods but also achieves lower estimation error.

Author Information

Mohammad Taha Bahadori (U of Southern California)
Qi (Rose) Yu (University of Southern California)
Yan Liu (University of Southern California)

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