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December  2019, 6(2): 385-400. doi: 10.3934/jcd.2019019

Discrete gradients for computational Bayesian inference

Sahani Pathiraja and  Sebastian Reich

University of Potsdam, Institute of Mathematics, Karl-Liebknecht-Str. 24/25, Potsdam, D-14476, Germany

Received  March 2019 Revised  July 2019 Published  November 2019

Fund Project: This research has been partially funded by Deutsche Forschungsgemeinschaft (DFG) through grant CRC 1294 'Data Assimilation' (projects A02 and B04).

In this paper, we exploit the gradient flow structure of continuous-time formulations of Bayesian inference in terms of their numerical time-stepping. We focus on two particular examples, namely, the continuous-time ensemble Kalman–Bucy filter and a particle discretisation of the Fokker–Planck equation associated to Brownian dynamics. Both formulations can lead to stiff differential equations which require special numerical methods for their efficient numerical implementation. We compare discrete gradient methods to alternative semi-implicit and other iterative implementations of the underlying Bayesian inference problems.

Keywords: Bayesian inference, Monte Carlo methods, gradient dynamics, geometric integration, interacting particle systems.
Mathematics Subject Classification: Primary: 62F15, 65C05, 82C22, 65P99; Secondary: 65C35.
Citation: Sahani Pathiraja, Sebastian Reich. Discrete gradients for computational Bayesian inference. Journal of Computational Dynamics, 2019, 6 (2) : 385-400. doi: 10.3934/jcd.2019019
References:
[1]

J. Amezcua, E. Kalnay, K. Ide and S. Reich, Ensemble transform Kalman-Bucy filters, Q. J. R. Meteor. Soc., 140 (2014), 995-1004.  doi: 10.1002/qj.2186.  Google Scholar

[2]

U. M. Ascher, Numerical Methods for Evolutionary Differential Equations, Computational Science & Engineering, 5. Society for Industrial and Applied Mathematics (SIAM), Philadelphia, PA, 2008. doi: 10.1137/1.9780898718911.  Google Scholar

[3]

K. Bergemann and S. Reich, A localization technique for ensemble Kalman filters, Q. J. R. Meteorological Soc., 136 (2010), 701-707.  doi: 10.1002/qj.591.  Google Scholar

[4]

K. Bergemann and S. Reich, A mollified ensemble Kalman filter, Q. J. R. Meteorological Soc., 136 (2010), 1636-1643.  doi: 10.1002/qj.672.  Google Scholar

[5]

K. Bergemann and S. Reich, An ensemble Kalman-Bucy filter for continuous data assimilation, Meteorolog. Zeitschrift, 21 (2012), 213-219.  doi: 10.1127/0941-2948/2012/0307.  Google Scholar

[6]

D. Blömker, C. Schillings and P. Wacker, A strongly convergent numerical scheme for ensemble Kalman inversion, SIAM J. Numer. Anal., 56 (2018), 2537-2562.  doi: 10.1137/17M1132367.  Google Scholar

[7]

Y. Chen and D. S. Oliver, Levenberg-Marquardt forms of the iterative ensemble smoother for efficient history matching and uncertainty quantification, Computational Geoscience, 17 (2013), 689-703.  doi: 10.1007/s10596-013-9351-5.  Google Scholar

[8]

N. Chustagulprom, S. Reich and M. Reinhardt, A hybrid ensemble transform filter for nonlinear and spatially extended dynamical systems, SIAM/ASA J. Uncertainty Quantification, 4 (2016), 592-608.  doi: 10.1137/15M1040967.  Google Scholar

[9]

D. Crisan and J. Xiong, Approximate McKean-Vlasov representation for a class of SPDEs, Stochastics, 82 (2010), 53-68.  doi: 10.1080/17442500902723575.  Google Scholar

[10]

F. Daum and J. Huang, Particle filter for nonlinear filters, in Acoustics, Speech and Signal Processing (ICASSP), 2011 IEEE International Conference on, (2011), 5920–5923. Google Scholar

[11]

J. de Wiljes, S. Reich and W. Stannat, Long-time stability and accuracy of the ensemble Kalman-Bucy filter for fully observed processes and small measurement noise, SIAM J. Appl. Dyn. Syst., 17 (2018), 1152-1181.  doi: 10.1137/17M1119056.  Google Scholar

[12]

P. Degond and F.-J. Mustieles, A deterministic approximation of diffusion equations using particles, SIAM J. Sci. Comput., 11 (1990), 293-310.  doi: 10.1137/0911018.  Google Scholar

[13]

G. Detommaso, T. Cui, A. Spantini, Y. Marzouk and R. Scheichl, A Stein variational Newton method, Advances in Neural Information Processing Systems (NIPS 2018), 31 (2018), 9187-9197.   Google Scholar

[14]

A. A. Emerik and A. C. Reynolds, Ensemble smoother with multiple data assimilation, Computers & Geosciences, 55 (2013), 3-15.  doi: 10.1016/j.cageo.2012.03.011.  Google Scholar

[15]

G. Evensen, Data Assimilation. The Ensemble Kalman Filter, Second edition, Springer-Verlag, Berlin, 2009. doi: 10.1007/978-3-642-03711-5.  Google Scholar

[16]

A. Garbuno-Inigo, F. Hoffmann, W. Li and A. Stuart, Gradient Structure for the Ensemble Kalman Flow with Noise, Technical Report arXiv: 1903.08866.v2, Caltech, 2019. Google Scholar

[17]

O. Gonzalez, Time integration of discrete Hamiltonian systems, J. Nonlinear Sci., 6 (1996), 449-467.  doi: 10.1007/BF02440162.  Google Scholar

[18]

J. Kaipio and E. Somersalo, Statistical and Computational Inverse Problems, Applied Mathematical Sciences, 160. Springer-Verlag, New York, 2005.  Google Scholar

[19]

N. B. Kovachki and A. M. Stuart, Ensemble Kalman inversion: A derivative-free technique for machine learning tasks, Inverse Problems, 35 (2019), 095005, 35 pp, arXiv: 1808.03620.  Google Scholar

[20]

K. Law, A. Stuart and K. Zygalakis, Data Assimilation: A Mathematical Introduction, Texts in Applied Mathematics, 62. Springer, Cham, 2015. doi: 10.1007/978-3-319-20325-6.  Google Scholar

[21]

Q. Liu and D. Wang, Stein variational gradient descent: A general purpose Bayesian inference algorithm, in Advances in Neural Information Processing Systems (NIPS 2016), 29 (2016), 2378–2386. Google Scholar

[22]

E. Lorenz, Deterministic non-periodic flows, J. Atmos. Sci., 20 (1963), 130-141.   Google Scholar

[23]

R. I. McLachlan, G. R. W. Quispel and N. Robidoux, Geometric integration using discrete gradients, Phil Trans. R. Soc. Lond. A Math. Phys. Eng. Sci., 357 (1999), 1021-1045.  doi: 10.1098/rsta.1999.0363.  Google Scholar

[24]

J. Nocedal and S. J. Wright, Numerical Optimization, Second edition. Springer Series in Operations Research and Financial Engineering. Springer, New York, 2006.  Google Scholar

[25]

Y. Ollivier, Online natural gradient as a Kalman filter, Electronic Journal of Statistics, 12 (2018), 2930-2961.  doi: 10.1214/18-EJS1468.  Google Scholar

[26]

G. Pavliotis, Stochastic Processes and Applications. Diffusion Processes, the Fokker-Planck and Langevin Equations, Texts in Applied Mathematics, 60. Springer, New York, 2014. doi: 10.1007/978-1-4939-1323-7.  Google Scholar

[27]

S. Reich, Enhancing energy conserving methods, BIT, 36 (1996), 122-134.  doi: 10.1007/BF01740549.  Google Scholar

[28]

S. Reich, A dynamical systems framework for intermittent data assimilation, BIT Numer Math, 51 (2011), 235-249.  doi: 10.1007/s10543-010-0302-4.  Google Scholar

[29]

S. Reich, Data assimilation: The Schrödinger perspective, Acta Numerica, 28 (2019), 635-710.  doi: 10.1017/S0962492919000011.  Google Scholar

[30] S. Reich and C. Cotter, Probabilistic Forecasting and Bayesian Data Assimilation, Cambridge University Press, Cambridge, 2015.  doi: 10.1017/CBO9781107706804.  Google Scholar
[31]

C. P. Robert, The Bayesian Choice: From Decision-Theoretic Motivations to Computational Implementations, Second edition, Springer Texts in Statistics, Springer-Verlag, New York, 2001.  Google Scholar

[32]

G. Russo, Deterministic diffusion of particles, Comm. Pure Appl. Math., 43 (1990), 697-733.  doi: 10.1002/cpa.3160430602.  Google Scholar

[33]

P. Sakov and P. Oke, A deterministic formulation of the ensemble Kalman filter: An alternative to ensemble square root filters, Tellus, 60A (2008), 361-371.   Google Scholar

[34]

P. Sakov, D. Oliver and L. Bertino, An iterative EnKF for strongly nonlinear systems, Mon. Wea. Rev., 140 (2012), 1988-2004.  doi: 10.1175/MWR-D-11-00176.1.  Google Scholar

[35]

A. M. Stuart, Numerical analysis and dynamical systems, Acta Numer., Cambridge Univ. Press, Cambridge, 3 (1994), 467–572. doi: 10.1017/S0962492900002488.  Google Scholar

[36]

A. Tarantola, Inverse Problem Theory and Methods for Model Parameter Estimation, Society for Industrial and Applied Mathematics (SIAM), Philadelphia, PA, 2005. doi: 10.1137/1.9780898717921.  Google Scholar

[37]

H. Yserentant, A new class of particle methods, Numer. Math., 76 (1997), 87-109.  doi: 10.1007/s002110050255.  Google Scholar

show all references

References:
[1]

J. Amezcua, E. Kalnay, K. Ide and S. Reich, Ensemble transform Kalman-Bucy filters, Q. J. R. Meteor. Soc., 140 (2014), 995-1004.  doi: 10.1002/qj.2186.  Google Scholar

[2]

U. M. Ascher, Numerical Methods for Evolutionary Differential Equations, Computational Science & Engineering, 5. Society for Industrial and Applied Mathematics (SIAM), Philadelphia, PA, 2008. doi: 10.1137/1.9780898718911.  Google Scholar

[3]

K. Bergemann and S. Reich, A localization technique for ensemble Kalman filters, Q. J. R. Meteorological Soc., 136 (2010), 701-707.  doi: 10.1002/qj.591.  Google Scholar

[4]

K. Bergemann and S. Reich, A mollified ensemble Kalman filter, Q. J. R. Meteorological Soc., 136 (2010), 1636-1643.  doi: 10.1002/qj.672.  Google Scholar

[5]

K. Bergemann and S. Reich, An ensemble Kalman-Bucy filter for continuous data assimilation, Meteorolog. Zeitschrift, 21 (2012), 213-219.  doi: 10.1127/0941-2948/2012/0307.  Google Scholar

[6]

D. Blömker, C. Schillings and P. Wacker, A strongly convergent numerical scheme for ensemble Kalman inversion, SIAM J. Numer. Anal., 56 (2018), 2537-2562.  doi: 10.1137/17M1132367.  Google Scholar

[7]

Y. Chen and D. S. Oliver, Levenberg-Marquardt forms of the iterative ensemble smoother for efficient history matching and uncertainty quantification, Computational Geoscience, 17 (2013), 689-703.  doi: 10.1007/s10596-013-9351-5.  Google Scholar

[8]

N. Chustagulprom, S. Reich and M. Reinhardt, A hybrid ensemble transform filter for nonlinear and spatially extended dynamical systems, SIAM/ASA J. Uncertainty Quantification, 4 (2016), 592-608.  doi: 10.1137/15M1040967.  Google Scholar

[9]

D. Crisan and J. Xiong, Approximate McKean-Vlasov representation for a class of SPDEs, Stochastics, 82 (2010), 53-68.  doi: 10.1080/17442500902723575.  Google Scholar

[10]

F. Daum and J. Huang, Particle filter for nonlinear filters, in Acoustics, Speech and Signal Processing (ICASSP), 2011 IEEE International Conference on, (2011), 5920–5923. Google Scholar

[11]

J. de Wiljes, S. Reich and W. Stannat, Long-time stability and accuracy of the ensemble Kalman-Bucy filter for fully observed processes and small measurement noise, SIAM J. Appl. Dyn. Syst., 17 (2018), 1152-1181.  doi: 10.1137/17M1119056.  Google Scholar

[12]

P. Degond and F.-J. Mustieles, A deterministic approximation of diffusion equations using particles, SIAM J. Sci. Comput., 11 (1990), 293-310.  doi: 10.1137/0911018.  Google Scholar

[13]

G. Detommaso, T. Cui, A. Spantini, Y. Marzouk and R. Scheichl, A Stein variational Newton method, Advances in Neural Information Processing Systems (NIPS 2018), 31 (2018), 9187-9197.   Google Scholar

[14]

A. A. Emerik and A. C. Reynolds, Ensemble smoother with multiple data assimilation, Computers & Geosciences, 55 (2013), 3-15.  doi: 10.1016/j.cageo.2012.03.011.  Google Scholar

[15]

G. Evensen, Data Assimilation. The Ensemble Kalman Filter, Second edition, Springer-Verlag, Berlin, 2009. doi: 10.1007/978-3-642-03711-5.  Google Scholar

[16]

A. Garbuno-Inigo, F. Hoffmann, W. Li and A. Stuart, Gradient Structure for the Ensemble Kalman Flow with Noise, Technical Report arXiv: 1903.08866.v2, Caltech, 2019. Google Scholar

[17]

O. Gonzalez, Time integration of discrete Hamiltonian systems, J. Nonlinear Sci., 6 (1996), 449-467.  doi: 10.1007/BF02440162.  Google Scholar

[18]

J. Kaipio and E. Somersalo, Statistical and Computational Inverse Problems, Applied Mathematical Sciences, 160. Springer-Verlag, New York, 2005.  Google Scholar

[19]

N. B. Kovachki and A. M. Stuart, Ensemble Kalman inversion: A derivative-free technique for machine learning tasks, Inverse Problems, 35 (2019), 095005, 35 pp, arXiv: 1808.03620.  Google Scholar

[20]

K. Law, A. Stuart and K. Zygalakis, Data Assimilation: A Mathematical Introduction, Texts in Applied Mathematics, 62. Springer, Cham, 2015. doi: 10.1007/978-3-319-20325-6.  Google Scholar

[21]

Q. Liu and D. Wang, Stein variational gradient descent: A general purpose Bayesian inference algorithm, in Advances in Neural Information Processing Systems (NIPS 2016), 29 (2016), 2378–2386. Google Scholar

[22]

E. Lorenz, Deterministic non-periodic flows, J. Atmos. Sci., 20 (1963), 130-141.   Google Scholar

[23]

R. I. McLachlan, G. R. W. Quispel and N. Robidoux, Geometric integration using discrete gradients, Phil Trans. R. Soc. Lond. A Math. Phys. Eng. Sci., 357 (1999), 1021-1045.  doi: 10.1098/rsta.1999.0363.  Google Scholar

[24]

J. Nocedal and S. J. Wright, Numerical Optimization, Second edition. Springer Series in Operations Research and Financial Engineering. Springer, New York, 2006.  Google Scholar

[25]

Y. Ollivier, Online natural gradient as a Kalman filter, Electronic Journal of Statistics, 12 (2018), 2930-2961.  doi: 10.1214/18-EJS1468.  Google Scholar

[26]

G. Pavliotis, Stochastic Processes and Applications. Diffusion Processes, the Fokker-Planck and Langevin Equations, Texts in Applied Mathematics, 60. Springer, New York, 2014. doi: 10.1007/978-1-4939-1323-7.  Google Scholar

[27]

S. Reich, Enhancing energy conserving methods, BIT, 36 (1996), 122-134.  doi: 10.1007/BF01740549.  Google Scholar

[28]

S. Reich, A dynamical systems framework for intermittent data assimilation, BIT Numer Math, 51 (2011), 235-249.  doi: 10.1007/s10543-010-0302-4.  Google Scholar

[29]

S. Reich, Data assimilation: The Schrödinger perspective, Acta Numerica, 28 (2019), 635-710.  doi: 10.1017/S0962492919000011.  Google Scholar

[30] S. Reich and C. Cotter, Probabilistic Forecasting and Bayesian Data Assimilation, Cambridge University Press, Cambridge, 2015.  doi: 10.1017/CBO9781107706804.  Google Scholar
[31]

C. P. Robert, The Bayesian Choice: From Decision-Theoretic Motivations to Computational Implementations, Second edition, Springer Texts in Statistics, Springer-Verlag, New York, 2001.  Google Scholar

[32]

G. Russo, Deterministic diffusion of particles, Comm. Pure Appl. Math., 43 (1990), 697-733.  doi: 10.1002/cpa.3160430602.  Google Scholar

[33]

P. Sakov and P. Oke, A deterministic formulation of the ensemble Kalman filter: An alternative to ensemble square root filters, Tellus, 60A (2008), 361-371.   Google Scholar

[34]

P. Sakov, D. Oliver and L. Bertino, An iterative EnKF for strongly nonlinear systems, Mon. Wea. Rev., 140 (2012), 1988-2004.  doi: 10.1175/MWR-D-11-00176.1.  Google Scholar

[35]

A. M. Stuart, Numerical analysis and dynamical systems, Acta Numer., Cambridge Univ. Press, Cambridge, 3 (1994), 467–572. doi: 10.1017/S0962492900002488.  Google Scholar

[36]

A. Tarantola, Inverse Problem Theory and Methods for Model Parameter Estimation, Society for Industrial and Applied Mathematics (SIAM), Philadelphia, PA, 2005. doi: 10.1137/1.9780898717921.  Google Scholar

[37]

H. Yserentant, A new class of particle methods, Numer. Math., 76 (1997), 87-109.  doi: 10.1007/s002110050255.  Google Scholar

Figure 1.  Exact solution and numerical approximations to the mean $ m_\tau $ and variance $ \sigma_\tau $ estimated by the EnKBF using the discrete gradient (DG) method with $ \theta = 1 $ and the semi-implicit (SI) Euler method with step-sizes (a) $ \Delta \tau = 0.1 $, (b) $ \Delta \tau = 0.2 $, (c) $ \Delta \tau = 0.5 $, (d) $ \Delta \tau = 1.0 $
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Figure 2.  Exact final values and numerical approximations to the mean $ m_\tau $ and variance $ \sigma_\tau $ estimated by the EnKBF using the discrete gradient (DG) with $ \theta = 1 $, the semi-implicit (SI) Euler, and the gradient-free, explicit (IEnKF) method with step-sizes (a) $ \Delta \tau = 0.01 $, (b) $ \Delta \tau = 0.1 $, (c) $ \Delta \tau = 0.2 $, (d) $ \Delta \tau = 0.5 $. The reference time evolution of the mean and variance is given by the explicit Euler method with step-size $ \Delta \tau = 0.00025 $
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Figure 3.  Exact final values and numerical approximations to the mean $ m_t $ and variance $ \sigma_t $ for the linear problem. Posterior is estimated by the Fokker-Planck dynamics with $ M = 10 $ particles using the discrete gradient (DG) method with $ \theta = 1 $ and the semi-implicit (SI) Euler method with step-sizes (a) $ \Delta \tau = 0.004 $, (b) $ \Delta \tau = 0.01 $, (c) $ \Delta \tau = 0.04 $, (d) $ \Delta \tau = 0.1 $. The reference time evolution of the mean and variance is given by the Explicit Euler (EE) method with step-size $ \Delta \tau = 2 \times 10^{-4} $
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Figure 4.  Exact final values and numerical approximations to the mean $ m_t $ and variance $ \sigma_t $ for the non-linear problem. Posterior is estimated by the Fokker-Planck dynamics using the discrete gradient (DG) method with $ \theta = 1 $ and the semi-implicit (SI) Euler method with step-sizes (a) $ \Delta \tau = 0.002 $, (b) $ \Delta \tau = 0.005 $, (c) $ \Delta \tau = 0.02 $, (d) $ \Delta \tau = 0.05 $. The reference time evolution of the mean and variance is given by the Explicit Euler (EE) method with step-size $ \Delta \tau = 2.5 \times 10^{-6} $
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Table 1.  RMSE for sequential data assimilation applied to the Lorenz-63 model. The parameter $ \alpha = 1 $ corresponds to a standard square root ensemble Kalman filter, while $ \alpha<1 $ results in a Gaussian mixture approximation to the prior and posterior distributions. Small improvements over the ensemble Kaman filter can be found for ensemble sizes $ M\ge 35 $
$ \alpha\backslash M $ $ 15 $ $ 20 $ $ 25 $ $ 30 $ $ 35 $ $ 40 $ $ 45 $ $ 50 $
$ 0.8 $ $ 2.5145 $ $ 2.4726 $ $ 2.4471 $ $ 2.4406 $ $ 2.4221 $ $ 2.4173 $ $ 2.4162 $ $ 2.4112 $
$ 0.85 $ $ 2.5048 $ $ 2.4585 $ $ 2.4357 $ $ 2.4330 $ $ 2.4186 $ $ 2.4161 $ $ 2.4020 $ $ 2.4026 $
$ 0.9 $ $ 2.4989 $ $ 2.4493 $ $ 2.4396 $ $ 2.4259 $ $ 2.4177 $ $ 2.4103 $ $ 2.4106 $ $ 2.4075 $
$ 0.95 $ $ 2.4998 $ $ 2.4605 $ $ 2.4399 $ $ 2.4327 $ $ 2.4242 $ $ 2.4132 $ $ 2.4162 $ $ 2.4131 $
$ 1.0 $ $ 2.4804 $ $ 2.4597 $ $ 2.4518 $ $ 2.4354 $ $ 2.4334 $ $ 2.4247 $ $ 2.4244 $ $ 2.4203 $
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$ \alpha\backslash M $ $ 15 $ $ 20 $ $ 25 $ $ 30 $ $ 35 $ $ 40 $ $ 45 $ $ 50 $
$ 0.8 $ $ 2.5145 $ $ 2.4726 $ $ 2.4471 $ $ 2.4406 $ $ 2.4221 $ $ 2.4173 $ $ 2.4162 $ $ 2.4112 $
$ 0.85 $ $ 2.5048 $ $ 2.4585 $ $ 2.4357 $ $ 2.4330 $ $ 2.4186 $ $ 2.4161 $ $ 2.4020 $ $ 2.4026 $
$ 0.9 $ $ 2.4989 $ $ 2.4493 $ $ 2.4396 $ $ 2.4259 $ $ 2.4177 $ $ 2.4103 $ $ 2.4106 $ $ 2.4075 $
$ 0.95 $ $ 2.4998 $ $ 2.4605 $ $ 2.4399 $ $ 2.4327 $ $ 2.4242 $ $ 2.4132 $ $ 2.4162 $ $ 2.4131 $
$ 1.0 $ $ 2.4804 $ $ 2.4597 $ $ 2.4518 $ $ 2.4354 $ $ 2.4334 $ $ 2.4247 $ $ 2.4244 $ $ 2.4203 $
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