The identification of diffusion processes is challenging for many real-world systems with sparsely sampled observation data. In this work, we propose a data augmentation-based sparse Bayesian learning method to identify a class of diffusion processes from sparsely sampled data. We impute latent unsampled diffusion paths between adjacent observations and construct a candidate model for the diffusion processes with the sparsity-inducing prior on model parameters. Given the augmented data and candidate model, we investigate the full joint posterior distribution of all the parameters and latent diffusion paths under a Bayesian learning framework. We then design a Markov chain Monte Carlo sampler with non-degenerate acceptance probability on system dimension to draw samples from the posterior distribution to estimate the parameters and latent diffusion paths. Particularly, the proposed method can handle sparse data that are regularly or irregularly sampled in time. Simulations on the well-known Langevin equation, homogeneous diffusion in a symmetric double-well potential, and stochastic Lotka–Volterra equation demonstrate the effectiveness and considerable accuracy of the proposed method.
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March 2023
Research Article|
March 08 2023
Data augmentation-based statistical inference of diffusion processes
Yasen Wang
;
Yasen Wang
(Conceptualization, Formal analysis, Funding acquisition, Methodology, Software, Visualization, Writing – original draft)
1
School of Mechanical Science and Engineering, Huazhong University of Science and Technology
, Wuhan, Hubei 430074, China
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Cheng Cheng
;
Cheng Cheng
(Funding acquisition, Supervision, Writing – review & editing)
2
School of Artificial Intelligence and Automation, Huazhong University of Science and Technology
, Wuhan, Hubei 430074, China
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Hongwei Sun;
Hongwei Sun
(Software)
2
School of Artificial Intelligence and Automation, Huazhong University of Science and Technology
, Wuhan, Hubei 430074, China
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Junyang Jin
;
Junyang Jin
a)
(Methodology, Supervision, Writing – review & editing)
3
HUST-Wuxi Research Institute
, Wuxi, Jiangsu 214174, China
a)Author to whom correspondence should be addressed: [email protected]
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Huazhen Fang
Huazhen Fang
(Methodology, Supervision, Writing – review & editing)
4
Department of Mechanical Engineering, University of Kansas
, Lawrence, Kansas 66045, USA
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a)Author to whom correspondence should be addressed: [email protected]
Chaos 33, 033115 (2023)
Article history
Received:
September 08 2022
Accepted:
February 17 2023
Citation
Yasen Wang, Cheng Cheng, Hongwei Sun, Junyang Jin, Huazhen Fang; Data augmentation-based statistical inference of diffusion processes. Chaos 1 March 2023; 33 (3): 033115. https://doi.org/10.1063/5.0124763
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