Tree-Structured Recurrent Switching Linear Dynamical Systems for Multi-Scale Modeling
By Josue Nassar, Scott W. Linderman, Mónica F. Bugallo, Il-Su Park. 2018
85 citations recorded by the source corpus.
Many real-world systems studied are governed by complex, nonlinear dynamics. By modeling these dynamics, we can gain insight into how these systems work, make predictions about how they will behave, and develop strategies for controlling them. While there are many methods for modeling nonlinear dynamical systems, existing techniques face a trade off between offering interpretable descriptions and making accurate predictions. Here, we develop a class of models that aims to achieve both simultaneously, smoothly interpolating between simple descriptions and more complex, yet also more accurate models. Our probabilistic model achieves this multi-scale property through a hierarchy of locally linear dynamics that jointly approximate global nonlinear dynamics. We call it the tree-structured recurrent switching linear dynamical system. To fit this model, we present a fully-Bayesian sampling procedure using Polya-Gamma data augmentation to allow for fast and conjugate Gibbs sampling. Through a variety of synthetic and real examples, we show how these models outperform existing methods in both interpretability and predictive capability.
Subfields: Artificial Intelligence, Computational Theory and Mathematics, Management Science and Operations Research
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Citations in the corpus
- GP-Tree: A Gaussian Process Classifier for Few-Shot Incremental Learning (2021, positive): “(Nassar et al., 2019) proposed to use a tree-structure stick break for linear dynamical systems.”