# American Institute of Mathematical Sciences

July  2021, 17(4): 1681-1711. doi: 10.3934/jimo.2020040

## The Glowinski–Le Tallec splitting method revisited: A general convergence and convergence rate analysis

 Department of Mathematics, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong SAR, China

Received  August 2019 Revised  October 2019 Published  July 2021 Early access  February 2020

Fund Project: The work of L.-Z. Liao was supported in part by grants from Hong Kong Baptist University (FRG) and General Research Fund (GRF) of Hong Kong

In this paper, we focus on a splitting method called the $\theta$-scheme proposed by Glowinski and Le Tallec in [17,20,27]. First, we present an elaborative convergence analysis in a Hilbert space and propose a general convergent inexact $\theta$-scheme. Second, for unconstrained problems, we prove the convergence of the $\theta$-scheme and show a sublinear convergence rate in terms of objective value. Furthermore, a practical inexact $\theta$-scheme is derived to solve $l_2$-loss based problems and its convergence is proved. Third, for constrained problems, even though the convergence of the $\theta$-scheme is available in the literature, yet its sublinear convergence rate is unknown until we provide one via a variational reformulation of the solution set. Besides, in order to relax the condition imposed on the $\theta$-scheme, we propose a new variant and show its convergence. Finally, some preliminary numerical experiments demonstrate the efficiency of the $\theta$-scheme and our proposed methods.

Citation: Yaonan Ma, Li-Zhi Liao. The Glowinski–Le Tallec splitting method revisited: A general convergence and convergence rate analysis. Journal of Industrial and Management Optimization, 2021, 17 (4) : 1681-1711. doi: 10.3934/jimo.2020040
##### References:
 [1] M. V. Afonso, J. M. Bioucas-Dias and and M. A. Figueiredo, Fast image recovery using variable splitting and constrained optimization, IEEE Trans. Image Process., 19 (2010), 2345-2356.  doi: 10.1109/TIP.2010.2047910. [2] N. Ahmed, T. Natarajan and and K. R. Rao, Discrete cosine transform, IEEE Trans. Comput., C-23 (1974), 90-93.  doi: 10.1109/T-C.1974.223784. [3] J. B. Baillon and G. Haddad, Quelques propriétés des opérateurs angle-bornés etn-cycliquement monotones, Israel J. Math., 26 (1977), 137-150.  doi: 10.1007/BF03007664. [4] H. H. Bauschke and P. L. Combettes, et al., Convex Analysis and Monotone Operator Theory in Hilbert Spaces, CMS Books in Mathematics, Springer, Cham, 2017. doi: 10.1007/978-3-319-48311-5. [5] A. Beck and M. Teboulle, Fast gradient-based algorithms for constrained total variation image denoising and deblurring problems, IEEE Trans. Image Process., 18 (2009), 2419-2434.  doi: 10.1109/TIP.2009.2028250. [6] A. Beck and M. Teboulle, A fast iterative shrinkage-thresholding algorithm for linear inverse problems, SIAM J. Imaging Sci., 2 (2009), 183-202.  doi: 10.1137/080716542. [7] A. Beck and M. Teboulle, A fast dual proximal gradient algorithm for convex minimization and applications, Oper. Res. Lett., 42 (2014), 1-6.  doi: 10.1016/j.orl.2013.10.007. [8] D. P. Bertsekas, Nonlinear Programming, Athena Scientific Optimization and Computation Series, Athena Scientific, Belmont, MA, 1999. [9] S. Boyd, N. Parikh, E. Chu, B. Peleato, J. Eckstein and et al., Distributed optimization and statistical learning via the alternating direction method of multipliers, Foundations and Trends in Machine Learning, 3 (2010), 1-122.  doi: 10.1561/2200000016. [10] P. L. Combettes, Solving monotone inclusions via compositions of nonexpansive averaged operators, Optimization, 53 (2004), 475-504.  doi: 10.1080/02331930412331327157. [11] P. L. Combettes and V. R. Wajs, Signal recovery by proximal forward-backward splitting, Multiscale Model. Simul., 4 (2005), 1168-1200.  doi: 10.1137/050626090. [12] J. Douglas and H. H. Rachford Jr., On the numerical solution of heat conduction problems in two and three space variables, Trans. Amer. Math. Soc., 82 (1956), 421-439.  doi: 10.1090/S0002-9947-1956-0084194-4. [13] J. Eckstein and D. P. Bertsekas, On the Douglas-Rachford splitting method and the proximal point algorithm for maximal monotone operators, Math. Programming, 55 (1992), 293-318.  doi: 10.1007/BF01581204. [14] J. Eckstein and W. Yao, Augmented Lagrangian and alternating direction methods for convex optimization: A tutorial and some illustrative computational results, RUTCOR Research Reports, 32 (2012). [15] R. Fletcher, Conjugate gradient methods for indefinite systems, in Numerical Analysis, Lecture Notes in Math., 506, Springer, Berlin, 1976, 73–89. doi: 10.1007/BFb0080116. [16] J. C. Gilbert and J. Nocedal, Global convergence properties of conjugate gradient methods for optimization, SIAM J. Optim., 2 (1992), 21-42.  doi: 10.1137/0802003. [17] R. Glowinski, Splitting methods for the numerical solution of the incompressible Navier-Stokes equations, in Vistas in Applied Mathematics, Optimization Software, New York, 1986, 57–95. [18] R. Glowinski, Variational Methods for the Numerical Solution of Nonlinear Elliptic Problems, CBMS-NSF Regional Conference Series in Applied Mathematics, 86, Society for Industrial and Applied Mathematics (SIAM), Philadelphia, PA, 2015. doi: 10.1137/1.9781611973785.ch1. [19] R. Glowinski, P. G. Ciarlet and J.-L. Lions, Numerical Methods for Fluids: Finite Element Methods for Incompressible Viscous Flow, North Holland, 2003. [20] R. Glowinski and P. Le Tallec, Augmented Lagrangian and Operator-Splitting Methods in Nonlinear Mechanics, SIAM Studies in Applied Mathematics, 9. Society for Industrial and Applied Mathematics (SIAM), Philadelphia, PA, 1989. doi: 10.1137/1.9781611970838. [21] R. Glowinski, S. Leung and J. L. Qian, Operator-splitting based fast sweeping methods for isotropic wave propagation in a moving fluid, SIAM J. Sci. Comput., 38 (2016), A1195–A1223. doi: 10.1137/15M1043868. [22] R. Glowinski and A. Marroco, Sur l'approximation, par éléments finis d'ordre un, et larésolution, par pénalisation-dualité d'une classe de problèmes de dirichlet non linéaires, Rev. Française Automat. Informat. Recherche Opérationnelle Sér. Rouge Anal. Numér., 9 (1975), 41–76. doi: 10.1051/m2an/197509R200411. [23] R. Glowinski, S. J. Osher and W. T. Yin, Splitting Methods in Communication, Imaging, Science, and Engineering, Scientific Computation, Springer, Cham, 2016. doi: 10.1007/978-3-319-41589-5. [24] T. Goldstein, B. O'Donoghue, S. Setzer and R. Baraniuk, Fast alternating direction optimization methods, SIAM J. Imaging Sci., 7 (2014), 1588-1623.  doi: 10.1137/120896219. [25] S. Haubruge, V. H. Nguyen and J. J. Strodiot, Convergence analysis and applications of the Glowinski–Le Tallec splitting method for finding a zero of the sum of two maximal monotone operators, J. Optim. Theory Appl., 97 (1998), 645-673.  doi: 10.1023/A:1022646327085. [26] B. S. He and X. M. Yuan, On the $O(1/n)$ convergence rate of the Douglas–Rachford alternating direction method, SIAM J. Numer. Anal., 50 (2012), 700-709.  doi: 10.1137/110836936. [27] P. Le Tallec, Numerical Analysis of Viscoelastic Problems, Research in Applied Mathematics, 15, Masson, Paris, 1990. [28] P. L. Lions and B. Mercier, Splitting algorithms for the sum of two nonlinear operators, SIAM J. Numer. Anal., 16 (1979), 964-979.  doi: 10.1137/0716071. [29] G. I. Marchuk, Splitting and alternating direction methods, in Handbook of Numerical Analysis, Vol. I, Handb. Numer. Anal., 1, North-Holland, Amsterdam, 1990, 197–462. [30] C. C. Paige and M. A. Saunders, LSQR: An algorithm for sparse linear equations and sparse least squares, ACM Trans. Math. Software, 8 (1982), 43-71.  doi: 10.1145/355984.355989. [31] D. W. Peaceman and H. H. Rachford Jr., The numerical solution of parabolic and elliptic differential equations, J. Soc. Indust. Appl. Math., 3 (1955), 28-41.  doi: 10.1137/0103003. [32] K. R. Rao and P. Yip, Discrete Cosine Transform: Algorithms, Advantages, Applications, Academic Press, Inc., Boston, MA, 1990.  doi: 10.1016/c2009-0-22279-3. [33] R. T. Rockafellar, Convex Analysis, Princeton Mathematical Series, 28, Princeton University Press, Princeton, NJ, 1970. [34] R. Tibshirani, Regression shrinkage and selection via the lasso, J. Roy. Statist. Soc. Ser. B, 58 (1996), 267-288.  doi: 10.1111/j.2517-6161.1996.tb02080.x. [35] P. Tseng, Applications of a splitting algorithm to decomposition in convex programming and variational inequalities, SIAM J. Control Optim., 29 (1991), 119-138.  doi: 10.1137/0329006. [36] P. T. Vuong and J. J. Strodiot, The Glowinski–Le Tallec splitting method revisited in the framework of equilibrium problems in Hilbert spaces, J. Global Optim., 70 (2018), 477-495.  doi: 10.1007/s10898-017-0575-0. [37] H. R. Yue, Q. Z. Yang, X. F. Wang and X. M. Yuan, Implementing the alternating direction method of multipliers for big datasets: A case study of least absolute shrinkage and selection operator, SIAM J. Sci. Comput., 40 (2018), A3121–A3156. doi: 10.1137/17M1146567. [38] C. Zalinescu, Convex Analysis in General Vector Spaces, World Scientific Publishing Co., Inc., River Edge, NJ, 2002. doi: 10.1142/9789812777096. [39] E. H. Zarantonello, Projections on convex sets in Hilbert space and spectral theory. Ⅰ: Projections on convex sets; Ⅱ: Spectral theory, in Contributions to Nonlinear Functional Analysis, Academic Press, New York, 1971, 237-424.

show all references

##### References:
 [1] M. V. Afonso, J. M. Bioucas-Dias and and M. A. Figueiredo, Fast image recovery using variable splitting and constrained optimization, IEEE Trans. Image Process., 19 (2010), 2345-2356.  doi: 10.1109/TIP.2010.2047910. [2] N. Ahmed, T. Natarajan and and K. R. Rao, Discrete cosine transform, IEEE Trans. Comput., C-23 (1974), 90-93.  doi: 10.1109/T-C.1974.223784. [3] J. B. Baillon and G. Haddad, Quelques propriétés des opérateurs angle-bornés etn-cycliquement monotones, Israel J. Math., 26 (1977), 137-150.  doi: 10.1007/BF03007664. [4] H. H. Bauschke and P. L. Combettes, et al., Convex Analysis and Monotone Operator Theory in Hilbert Spaces, CMS Books in Mathematics, Springer, Cham, 2017. doi: 10.1007/978-3-319-48311-5. [5] A. Beck and M. Teboulle, Fast gradient-based algorithms for constrained total variation image denoising and deblurring problems, IEEE Trans. Image Process., 18 (2009), 2419-2434.  doi: 10.1109/TIP.2009.2028250. [6] A. Beck and M. Teboulle, A fast iterative shrinkage-thresholding algorithm for linear inverse problems, SIAM J. Imaging Sci., 2 (2009), 183-202.  doi: 10.1137/080716542. [7] A. Beck and M. Teboulle, A fast dual proximal gradient algorithm for convex minimization and applications, Oper. Res. Lett., 42 (2014), 1-6.  doi: 10.1016/j.orl.2013.10.007. [8] D. P. Bertsekas, Nonlinear Programming, Athena Scientific Optimization and Computation Series, Athena Scientific, Belmont, MA, 1999. [9] S. Boyd, N. Parikh, E. Chu, B. Peleato, J. Eckstein and et al., Distributed optimization and statistical learning via the alternating direction method of multipliers, Foundations and Trends in Machine Learning, 3 (2010), 1-122.  doi: 10.1561/2200000016. [10] P. L. Combettes, Solving monotone inclusions via compositions of nonexpansive averaged operators, Optimization, 53 (2004), 475-504.  doi: 10.1080/02331930412331327157. [11] P. L. Combettes and V. R. Wajs, Signal recovery by proximal forward-backward splitting, Multiscale Model. Simul., 4 (2005), 1168-1200.  doi: 10.1137/050626090. [12] J. Douglas and H. H. Rachford Jr., On the numerical solution of heat conduction problems in two and three space variables, Trans. Amer. Math. Soc., 82 (1956), 421-439.  doi: 10.1090/S0002-9947-1956-0084194-4. [13] J. Eckstein and D. P. Bertsekas, On the Douglas-Rachford splitting method and the proximal point algorithm for maximal monotone operators, Math. Programming, 55 (1992), 293-318.  doi: 10.1007/BF01581204. [14] J. Eckstein and W. Yao, Augmented Lagrangian and alternating direction methods for convex optimization: A tutorial and some illustrative computational results, RUTCOR Research Reports, 32 (2012). [15] R. Fletcher, Conjugate gradient methods for indefinite systems, in Numerical Analysis, Lecture Notes in Math., 506, Springer, Berlin, 1976, 73–89. doi: 10.1007/BFb0080116. [16] J. C. Gilbert and J. Nocedal, Global convergence properties of conjugate gradient methods for optimization, SIAM J. Optim., 2 (1992), 21-42.  doi: 10.1137/0802003. [17] R. Glowinski, Splitting methods for the numerical solution of the incompressible Navier-Stokes equations, in Vistas in Applied Mathematics, Optimization Software, New York, 1986, 57–95. [18] R. Glowinski, Variational Methods for the Numerical Solution of Nonlinear Elliptic Problems, CBMS-NSF Regional Conference Series in Applied Mathematics, 86, Society for Industrial and Applied Mathematics (SIAM), Philadelphia, PA, 2015. doi: 10.1137/1.9781611973785.ch1. [19] R. Glowinski, P. G. Ciarlet and J.-L. Lions, Numerical Methods for Fluids: Finite Element Methods for Incompressible Viscous Flow, North Holland, 2003. [20] R. Glowinski and P. Le Tallec, Augmented Lagrangian and Operator-Splitting Methods in Nonlinear Mechanics, SIAM Studies in Applied Mathematics, 9. Society for Industrial and Applied Mathematics (SIAM), Philadelphia, PA, 1989. doi: 10.1137/1.9781611970838. [21] R. Glowinski, S. Leung and J. L. Qian, Operator-splitting based fast sweeping methods for isotropic wave propagation in a moving fluid, SIAM J. Sci. Comput., 38 (2016), A1195–A1223. doi: 10.1137/15M1043868. [22] R. Glowinski and A. Marroco, Sur l'approximation, par éléments finis d'ordre un, et larésolution, par pénalisation-dualité d'une classe de problèmes de dirichlet non linéaires, Rev. Française Automat. Informat. Recherche Opérationnelle Sér. Rouge Anal. Numér., 9 (1975), 41–76. doi: 10.1051/m2an/197509R200411. [23] R. Glowinski, S. J. Osher and W. T. Yin, Splitting Methods in Communication, Imaging, Science, and Engineering, Scientific Computation, Springer, Cham, 2016. doi: 10.1007/978-3-319-41589-5. [24] T. Goldstein, B. O'Donoghue, S. Setzer and R. Baraniuk, Fast alternating direction optimization methods, SIAM J. Imaging Sci., 7 (2014), 1588-1623.  doi: 10.1137/120896219. [25] S. Haubruge, V. H. Nguyen and J. J. Strodiot, Convergence analysis and applications of the Glowinski–Le Tallec splitting method for finding a zero of the sum of two maximal monotone operators, J. Optim. Theory Appl., 97 (1998), 645-673.  doi: 10.1023/A:1022646327085. [26] B. S. He and X. M. Yuan, On the $O(1/n)$ convergence rate of the Douglas–Rachford alternating direction method, SIAM J. Numer. Anal., 50 (2012), 700-709.  doi: 10.1137/110836936. [27] P. Le Tallec, Numerical Analysis of Viscoelastic Problems, Research in Applied Mathematics, 15, Masson, Paris, 1990. [28] P. L. Lions and B. Mercier, Splitting algorithms for the sum of two nonlinear operators, SIAM J. Numer. Anal., 16 (1979), 964-979.  doi: 10.1137/0716071. [29] G. I. Marchuk, Splitting and alternating direction methods, in Handbook of Numerical Analysis, Vol. I, Handb. Numer. Anal., 1, North-Holland, Amsterdam, 1990, 197–462. [30] C. C. Paige and M. A. Saunders, LSQR: An algorithm for sparse linear equations and sparse least squares, ACM Trans. Math. Software, 8 (1982), 43-71.  doi: 10.1145/355984.355989. [31] D. W. Peaceman and H. H. Rachford Jr., The numerical solution of parabolic and elliptic differential equations, J. Soc. Indust. Appl. Math., 3 (1955), 28-41.  doi: 10.1137/0103003. [32] K. R. Rao and P. Yip, Discrete Cosine Transform: Algorithms, Advantages, Applications, Academic Press, Inc., Boston, MA, 1990.  doi: 10.1016/c2009-0-22279-3. [33] R. T. Rockafellar, Convex Analysis, Princeton Mathematical Series, 28, Princeton University Press, Princeton, NJ, 1970. [34] R. Tibshirani, Regression shrinkage and selection via the lasso, J. Roy. Statist. Soc. Ser. B, 58 (1996), 267-288.  doi: 10.1111/j.2517-6161.1996.tb02080.x. [35] P. Tseng, Applications of a splitting algorithm to decomposition in convex programming and variational inequalities, SIAM J. Control Optim., 29 (1991), 119-138.  doi: 10.1137/0329006. [36] P. T. Vuong and J. J. Strodiot, The Glowinski–Le Tallec splitting method revisited in the framework of equilibrium problems in Hilbert spaces, J. Global Optim., 70 (2018), 477-495.  doi: 10.1007/s10898-017-0575-0. [37] H. R. Yue, Q. Z. Yang, X. F. Wang and X. M. Yuan, Implementing the alternating direction method of multipliers for big datasets: A case study of least absolute shrinkage and selection operator, SIAM J. Sci. Comput., 40 (2018), A3121–A3156. doi: 10.1137/17M1146567. [38] C. Zalinescu, Convex Analysis in General Vector Spaces, World Scientific Publishing Co., Inc., River Edge, NJ, 2002. doi: 10.1142/9789812777096. [39] E. H. Zarantonello, Projections on convex sets in Hilbert space and spectral theory. Ⅰ: Projections on convex sets; Ⅱ: Spectral theory, in Contributions to Nonlinear Functional Analysis, Academic Press, New York, 1971, 237-424.
Left to right: original image, blurring image, and recovered image by $\theta$-scheme on TV-based deblurring
Visualization of function values, MSE, and ISNR on TV-based deblurring
Objective value with respect to the computing time and residual of the linear equation (29) with respect to the outer loop iteration on "news20.scale''
Objective value with respect to the computing time and residual of the linear equation (29) with respect to the outer loop iteration on "url_combined"
A sensitivity test of the $\theta$-scheme on TV-based deblurring
 $\beta_1$ $\beta_2$ Iteration Time (s) Objective MSE ISNR 0.1 0.1 $3000$ $106.41$ 0.6259 1.6135e-04 11.9101 0.3 0.2 2852 101.04 0.6259 1.5999e-04 11.9470 0.7 0.5 1202 42.45 0.6259 1.5999e-04 11.9470 0.8 0.5 1088 38.57 0.6259 1.5999e-04 11.9470 0.9 0.8 879 31.01 0.6259 1.5999e-04 11.9470 0.9 0.9 847 29.82 0.6259 1.5999e-04 11.9470
 $\beta_1$ $\beta_2$ Iteration Time (s) Objective MSE ISNR 0.1 0.1 $3000$ $106.41$ 0.6259 1.6135e-04 11.9101 0.3 0.2 2852 101.04 0.6259 1.5999e-04 11.9470 0.7 0.5 1202 42.45 0.6259 1.5999e-04 11.9470 0.8 0.5 1088 38.57 0.6259 1.5999e-04 11.9470 0.9 0.8 879 31.01 0.6259 1.5999e-04 11.9470 0.9 0.9 847 29.82 0.6259 1.5999e-04 11.9470
Comparison of $\theta$-scheme, ADMM+GPRSM, GADMM, and FISTA on TV-based deblurring under same inner precision
 Inner Algorithm Iteration Mean/Max Time (s) Objective MSE ISNR precision FGP 1e-02 $\theta$-scheme 763 4.00/4 29.00 0.6259 1.5999e-04 11.9470 ADMM+GPRSM 763 4.00/4 30.00 0.6259 1.5999e-04 11.9470 GADMM 1526 2.00/2 33.43 0.6259 1.5999e-04 11.9470 FISTA 3000 2.00/2 53.92 0.6261 1.5992e-04 11.9489 1e-04 $\theta$-scheme 763 4.00/6 28.84 0.6259 1.5999e-04 11.9470 ADMM+GPRSM 763 4.00/6 29.99 0.6259 1.5999e-04 11.9470 GADMM 1526 2.00/3 33.13 0.6259 1.5999e-04 11.9470 FISTA 3000 2.00/3 53.70 0.6261 1.5992e-04 11.9487 1e-06 $\theta$-scheme 763 4.60/20 28.31 0.6259 1.5999e-04 11.9470 ADMM+GPRSM 763 4.61/20 29.25 0.6259 1.5999e-04 11.9470 GADMM 1526 2.27/10 32.42 0.6259 1.5999e-04 11.9470 FISTA 3000 5.45/10 82.36 0.6259 1.5996e-04 11.9476 1e-08 $\theta$-scheme 763 8.65/20 38.37 0.6259 1.5999e-04 11.9470 ADMM+GPRSM 763 8.65/20 39.50 0.6259 1.5999e-04 11.9470 GADMM 1526 4.32/10 42.45 0.6259 1.5999e-04 11.9470 FISTA 1277 7.62/10 44.71 0.6259 1.5997e-04 11.9476 1e-10 $\theta$-scheme 762 16.61/20 58.43 0.6259 1.5999e-04 11.9470 ADMM+GPRSM 763 16.72/20 59.79 0.6259 1.5999e-04 11.9470 GADMM 1525 8.44/10 63.16 0.6259 1.5999e-04 11.9470 FISTA 1214 9.87/10 51.49 0.6259 1.5996e-04 11.9476
 Inner Algorithm Iteration Mean/Max Time (s) Objective MSE ISNR precision FGP 1e-02 $\theta$-scheme 763 4.00/4 29.00 0.6259 1.5999e-04 11.9470 ADMM+GPRSM 763 4.00/4 30.00 0.6259 1.5999e-04 11.9470 GADMM 1526 2.00/2 33.43 0.6259 1.5999e-04 11.9470 FISTA 3000 2.00/2 53.92 0.6261 1.5992e-04 11.9489 1e-04 $\theta$-scheme 763 4.00/6 28.84 0.6259 1.5999e-04 11.9470 ADMM+GPRSM 763 4.00/6 29.99 0.6259 1.5999e-04 11.9470 GADMM 1526 2.00/3 33.13 0.6259 1.5999e-04 11.9470 FISTA 3000 2.00/3 53.70 0.6261 1.5992e-04 11.9487 1e-06 $\theta$-scheme 763 4.60/20 28.31 0.6259 1.5999e-04 11.9470 ADMM+GPRSM 763 4.61/20 29.25 0.6259 1.5999e-04 11.9470 GADMM 1526 2.27/10 32.42 0.6259 1.5999e-04 11.9470 FISTA 3000 5.45/10 82.36 0.6259 1.5996e-04 11.9476 1e-08 $\theta$-scheme 763 8.65/20 38.37 0.6259 1.5999e-04 11.9470 ADMM+GPRSM 763 8.65/20 39.50 0.6259 1.5999e-04 11.9470 GADMM 1526 4.32/10 42.45 0.6259 1.5999e-04 11.9470 FISTA 1277 7.62/10 44.71 0.6259 1.5997e-04 11.9476 1e-10 $\theta$-scheme 762 16.61/20 58.43 0.6259 1.5999e-04 11.9470 ADMM+GPRSM 763 16.72/20 59.79 0.6259 1.5999e-04 11.9470 GADMM 1525 8.44/10 63.16 0.6259 1.5999e-04 11.9470 FISTA 1214 9.87/10 51.49 0.6259 1.5996e-04 11.9476
Comparison of $\theta$-scheme, ADMM+GPRSM, GADMM, and FISTA on TV-based deblurring under different inner precisions
 Inner Algorithm Iteration Mean/Max Time (s) Objective MSE ISNR precision FGP 1e-02 $\theta$-scheme 763 4.00/4 27.87 0.6259 1.5999e-04 11.9470 1e-02 ADMM+GPRSM 763 4.00/4 30.51 0.6259 1.5999e-04 11.9470 1e-04 GADMM 1526 2.00/3 33.01 0.6259 1.5999e-04 11.9470 1e-08 FISTA 1277 7.62/10 47.88 0.6259 1.5997e-04 11.9476
 Inner Algorithm Iteration Mean/Max Time (s) Objective MSE ISNR precision FGP 1e-02 $\theta$-scheme 763 4.00/4 27.87 0.6259 1.5999e-04 11.9470 1e-02 ADMM+GPRSM 763 4.00/4 30.51 0.6259 1.5999e-04 11.9470 1e-04 GADMM 1526 2.00/3 33.01 0.6259 1.5999e-04 11.9470 1e-08 FISTA 1277 7.62/10 47.88 0.6259 1.5997e-04 11.9476
Values of $\eta$, $L$ and $\beta_1 (\beta_2)$ for synthetic dataset
 (m, n, s) $\eta$ L $\beta_1(\beta_2)$ ($1\times10^4, 1.5\times10^4, 50\%$) 878.32 1.8416e+04 1.0860e-04 ($1\times10^4, 1.5\times10^4, 10\%$) 293.15 4.4668e+03 4.4775e-04 ($1.5\times10^4, 2\times10^4, 5\%$) 174.12 3.2264e+03 6.1989e-04 ($2\times10^4, 3\times10^4, 1\%$) 67.90 9.4158e+02 2.1241e-03 ($2\times10^5, 3\times10^5, 0.1\%$) 58.27 9.0143e+02 2.2187e-03 ($3\times10^5, 2\times10^6, 0.01\%$) 9.59 3.6101e+02 5.5400e-03
 (m, n, s) $\eta$ L $\beta_1(\beta_2)$ ($1\times10^4, 1.5\times10^4, 50\%$) 878.32 1.8416e+04 1.0860e-04 ($1\times10^4, 1.5\times10^4, 10\%$) 293.15 4.4668e+03 4.4775e-04 ($1.5\times10^4, 2\times10^4, 5\%$) 174.12 3.2264e+03 6.1989e-04 ($2\times10^4, 3\times10^4, 1\%$) 67.90 9.4158e+02 2.1241e-03 ($2\times10^5, 3\times10^5, 0.1\%$) 58.27 9.0143e+02 2.2187e-03 ($3\times10^5, 2\times10^6, 0.01\%$) 9.59 3.6101e+02 5.5400e-03
Comparison of IN-$\theta_{\text{LSQR}}$, IN-$\theta_{\text{Cholesky}}$, IN-$\theta_{1e-t}$ and IN-$\theta$ on synthetic dataset
 (m, n, s) Algorithm Iteration Mean/Max CG Time (s) Objective ($1\times10^4, 1.5\times10^4, 50\%$) IN-$\theta_{\text{LSQR}}$ 9 $\sim/\sim$ 24.72 5.8157e+04 IN-$\theta_{\text{Cholesky}}$ 9 $\sim/\sim$ 710.26 5.8157e+04 IN-$\theta_{1e-10}$ 10 7.00/10 27.00 5.8157e+04 IN-$\theta_{1e-8}$ 9 5.44/8 20.46 5.8157e+04 IN-$\theta_{1e-6}$ 9 3.44/6 15.51 5.8157e+04 IN-$\theta_{1e-4}$ 500 0.03/4 319.16 5.8157e+04 IN-$\theta_{1e-2}$ 500 0.01/2 314.86 5.8157e+04 IN-$\theta$ 10 0.90/1 11.27 5.8157e+04 ($1\times10^4, 1.5\times10^4, 10\%$) IN-$\theta_{\text{LSQR}}$ 9 $\sim/\sim$ 6.36 1.6892e+04 IN-$\theta_{\text{Cholesky}}$ 9 $\sim/\sim$ 61.89 1.6892e+04 IN-$\theta_{1e-10}$ 9 7.11/10 6.17 1.6892e+04 IN-$\theta_{1e-8}$ 9 5.44/8 5.11 1.6892e+04 IN-$\theta_{1e-6}$ 9 3.44/6 3.87 1.6892e+04 IN-$\theta_{1e-4}$ 500 0.03/4 77.57 1.6892e+04 IN-$\theta_{1e-2}$ 500 0.01/2 79.92 1.6892e+04 IN-$\theta$ 9 0.89/1 2.68 1.6892e+04 ($1.5\times10^4, 2\times10^4, 5\%$) IN-$\theta_{\text{LSQR}}$ 8 $\sim/\sim$ 5.98 1.0405e+04 IN-$\theta_{\text{Cholesky}}$ 8 $\sim/\sim$ 96.69 1.0405e+04 IN-$\theta_{1e-10}$ 9 7.11/10 6.57 1.0405e+04 IN-$\theta_{1e-8}$ 8 5.63/8 4.97 1.0405e+04 IN-$\theta_{1e-6}$ 8 3.63/6 3.85 1.0405e+04 IN-$\theta_{1e-4}$ 500 0.03/4 84.29 1.0405e+04 IN-$\theta_{1e-2}$ 500 0.01/2 83.01 1.0405e+04 IN-$\theta$ 9 0.89/1 2.81 1.0405e+04 ($2\times10^4, 3\times10^4, 1\%$) IN-$\theta_{\text{LSQR}}$ 10 $\sim/\sim$ 2.94 4.7993e+03 IN-$\theta_{\text{Cholesky}}$ 10 $\sim/\sim$ 232.74 4.7993e+03 IN-$\theta_{1e-10}$ 10 7.10/10 3.24 4.7993e+03 IN-$\theta_{1e-8}$ 11 4.82/8 2.73 4.7993e+03 IN-$\theta_{1e-6}$ 10 3.30/6 1.96 4.7993e+03 IN-$\theta_{1e-4}$ 500 0.03/4 36.20 4.7993e+03 IN-$\theta_{1e-2}$ 500 0.01/2 35.20 4.7993e+03 IN-$\theta$ 10 0.90/1 1.74 4.7993e+03 ($2\times10^5, 3\times10^5, 0.1\%$) IN-$\theta_{\text{LSQR}}$ 9 $\sim/\sim$ 38.52 4.9942e+03 IN-$\theta_{1e-10}$ 9 7.22/10 50.94 4.9942e+03 IN-$\theta_{1e-8}$ 9 5.44/8 41.94 4.9942e+03 IN-$\theta_{1e-6}$ 9 3.44/6 31.82 4.9942e+03 IN-$\theta_{1e-4}$ 500 0.03/4 644.25 4.9942e+03 IN-$\theta_{1e-2}$ 500 0.01/2 641.81 4.9942e+03 IN-$\theta$ 9 0.89/1 20.72 4.9942e+03 ($3\times10^5, 2\times10^6, 0.01\%$) IN-$\theta_{\text{LSQR}}$ 38 $\sim/\sim$ 159.14 2.1247e+03 IN-$\theta_{1e-10}$ 37 5.49/8 180.66 2.1247e+03 IN-$\theta_{1e-8}$ 37 3.95/7 146.45 2.1247e+03 IN-$\theta_{1e-6}$ 37 2.43/5 113.97 2.1247e+03 IN-$\theta_{1e-4}$ 500 0.08/4 707.33 2.1247e+03 IN-$\theta_{1e-2}$ 500 0.02/2 693.12 2.1247e+03 IN-$\theta$ 37 0.97/1 91.95 2.1247e+03
 (m, n, s) Algorithm Iteration Mean/Max CG Time (s) Objective ($1\times10^4, 1.5\times10^4, 50\%$) IN-$\theta_{\text{LSQR}}$ 9 $\sim/\sim$ 24.72 5.8157e+04 IN-$\theta_{\text{Cholesky}}$ 9 $\sim/\sim$ 710.26 5.8157e+04 IN-$\theta_{1e-10}$ 10 7.00/10 27.00 5.8157e+04 IN-$\theta_{1e-8}$ 9 5.44/8 20.46 5.8157e+04 IN-$\theta_{1e-6}$ 9 3.44/6 15.51 5.8157e+04 IN-$\theta_{1e-4}$ 500 0.03/4 319.16 5.8157e+04 IN-$\theta_{1e-2}$ 500 0.01/2 314.86 5.8157e+04 IN-$\theta$ 10 0.90/1 11.27 5.8157e+04 ($1\times10^4, 1.5\times10^4, 10\%$) IN-$\theta_{\text{LSQR}}$ 9 $\sim/\sim$ 6.36 1.6892e+04 IN-$\theta_{\text{Cholesky}}$ 9 $\sim/\sim$ 61.89 1.6892e+04 IN-$\theta_{1e-10}$ 9 7.11/10 6.17 1.6892e+04 IN-$\theta_{1e-8}$ 9 5.44/8 5.11 1.6892e+04 IN-$\theta_{1e-6}$ 9 3.44/6 3.87 1.6892e+04 IN-$\theta_{1e-4}$ 500 0.03/4 77.57 1.6892e+04 IN-$\theta_{1e-2}$ 500 0.01/2 79.92 1.6892e+04 IN-$\theta$ 9 0.89/1 2.68 1.6892e+04 ($1.5\times10^4, 2\times10^4, 5\%$) IN-$\theta_{\text{LSQR}}$ 8 $\sim/\sim$ 5.98 1.0405e+04 IN-$\theta_{\text{Cholesky}}$ 8 $\sim/\sim$ 96.69 1.0405e+04 IN-$\theta_{1e-10}$ 9 7.11/10 6.57 1.0405e+04 IN-$\theta_{1e-8}$ 8 5.63/8 4.97 1.0405e+04 IN-$\theta_{1e-6}$ 8 3.63/6 3.85 1.0405e+04 IN-$\theta_{1e-4}$ 500 0.03/4 84.29 1.0405e+04 IN-$\theta_{1e-2}$ 500 0.01/2 83.01 1.0405e+04 IN-$\theta$ 9 0.89/1 2.81 1.0405e+04 ($2\times10^4, 3\times10^4, 1\%$) IN-$\theta_{\text{LSQR}}$ 10 $\sim/\sim$ 2.94 4.7993e+03 IN-$\theta_{\text{Cholesky}}$ 10 $\sim/\sim$ 232.74 4.7993e+03 IN-$\theta_{1e-10}$ 10 7.10/10 3.24 4.7993e+03 IN-$\theta_{1e-8}$ 11 4.82/8 2.73 4.7993e+03 IN-$\theta_{1e-6}$ 10 3.30/6 1.96 4.7993e+03 IN-$\theta_{1e-4}$ 500 0.03/4 36.20 4.7993e+03 IN-$\theta_{1e-2}$ 500 0.01/2 35.20 4.7993e+03 IN-$\theta$ 10 0.90/1 1.74 4.7993e+03 ($2\times10^5, 3\times10^5, 0.1\%$) IN-$\theta_{\text{LSQR}}$ 9 $\sim/\sim$ 38.52 4.9942e+03 IN-$\theta_{1e-10}$ 9 7.22/10 50.94 4.9942e+03 IN-$\theta_{1e-8}$ 9 5.44/8 41.94 4.9942e+03 IN-$\theta_{1e-6}$ 9 3.44/6 31.82 4.9942e+03 IN-$\theta_{1e-4}$ 500 0.03/4 644.25 4.9942e+03 IN-$\theta_{1e-2}$ 500 0.01/2 641.81 4.9942e+03 IN-$\theta$ 9 0.89/1 20.72 4.9942e+03 ($3\times10^5, 2\times10^6, 0.01\%$) IN-$\theta_{\text{LSQR}}$ 38 $\sim/\sim$ 159.14 2.1247e+03 IN-$\theta_{1e-10}$ 37 5.49/8 180.66 2.1247e+03 IN-$\theta_{1e-8}$ 37 3.95/7 146.45 2.1247e+03 IN-$\theta_{1e-6}$ 37 2.43/5 113.97 2.1247e+03 IN-$\theta_{1e-4}$ 500 0.08/4 707.33 2.1247e+03 IN-$\theta_{1e-2}$ 500 0.02/2 693.12 2.1247e+03 IN-$\theta$ 37 0.97/1 91.95 2.1247e+03
Comparison of IN-$\theta_{\text{LSQR}}$, IN-$\theta_{1e-t}$ and IN-$\theta_{\text{R}}$ on "news20.scale''
 Algorithm Iteration Mean/Max CG Time (s) Objective IN-$\theta_{\text{LSQR}}$ 500 $\sim/\sim$ 26.31 6.5859e+05 IN-$\theta_{1e-10}$ 44 4.11/6 2.68 6.5859e+05 IN-$\theta_{1e-8}$ 44 3.07/5 2.28 6.5859e+05 IN-$\theta_{1e-6}$ 43 1.91/4 1.76 6.5859e+05 IN-$\theta_{1e-4}$ 500 0.08/3 10.92 6.5859e+05 IN-$\theta_{1e-2}$ 500 0.02/2 10.39 6.5860e+05 IN-$\theta_{\text{R}}$ 46 0.61/2 1.36 6.5859e+05
 Algorithm Iteration Mean/Max CG Time (s) Objective IN-$\theta_{\text{LSQR}}$ 500 $\sim/\sim$ 26.31 6.5859e+05 IN-$\theta_{1e-10}$ 44 4.11/6 2.68 6.5859e+05 IN-$\theta_{1e-8}$ 44 3.07/5 2.28 6.5859e+05 IN-$\theta_{1e-6}$ 43 1.91/4 1.76 6.5859e+05 IN-$\theta_{1e-4}$ 500 0.08/3 10.92 6.5859e+05 IN-$\theta_{1e-2}$ 500 0.02/2 10.39 6.5860e+05 IN-$\theta_{\text{R}}$ 46 0.61/2 1.36 6.5859e+05
Comparison of IN-$\theta_{\text{LSQR}}$, IN-$\theta_{1e-t}$ and IN-$\theta_{R}$ on "url_combined" dataset
 Algorithm Iteration Mean/Max CG Time (s) Objective IN-$\theta_{\text{LSQR}}$ 29 $\sim/\sim$ 1794.95 6.1097e+05 IN-$\theta_{1e-10}$ 30 4.00/4 869.09 6.0859e+05 IN-$\theta_{1e-8}$ 30 3.13/4 757.60 6.0859e+05 IN-$\theta_{1e-6}$ 30 3.00/3 740.08 6.0859e+05 IN-$\theta_{1e-4}$ 29 2.00/2 592.07 6.1097e+05 IN-$\theta_{1e-2}$ 29 1.10/2 474.73 6.1074e+05 IN-$\theta_{\text{R}}$ 29 0.90/2 454.99 6.1045e+05
 Algorithm Iteration Mean/Max CG Time (s) Objective IN-$\theta_{\text{LSQR}}$ 29 $\sim/\sim$ 1794.95 6.1097e+05 IN-$\theta_{1e-10}$ 30 4.00/4 869.09 6.0859e+05 IN-$\theta_{1e-8}$ 30 3.13/4 757.60 6.0859e+05 IN-$\theta_{1e-6}$ 30 3.00/3 740.08 6.0859e+05 IN-$\theta_{1e-4}$ 29 2.00/2 592.07 6.1097e+05 IN-$\theta_{1e-2}$ 29 1.10/2 474.73 6.1074e+05 IN-$\theta_{\text{R}}$ 29 0.90/2 454.99 6.1045e+05
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