All models, algorithms and strategies were implemented on the Graphics Processing Unit GPU to remove run time constraints, with which we achieve whole brain dataset fits in seconds to minutes.
We then evaluated fit, accuracy, precision and run time for different models of differing complexity against three common optimization algorithms and three parameter initialization strategies. Variability of the achieved quality of fit in actual data was evaluated on ten subjects of each of two population studies with a different acquisition protocol.
Convex Relaxation Techniques for Nonlinear Optimization
We find that optimization algorithms and multi-step optimization approaches have a considerable influence on performance and stability over subjects and over acquisition protocols. The gradient-free Powell conjugate-direction algorithm was found to outperform other common algorithms in terms of run time, fit, accuracy and precision.
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Toggle Main Navigation. Search MathWorks. This is especially useful for large, difficult problems and problems with uncertain costs or values where the uncertainty can be estimated with an appropriate reliability estimation. Under differentiability and constraint qualifications , the Karush—Kuhn—Tucker KKT conditions provide necessary conditions for a solution to be optimal.
Under convexity, these conditions are also sufficient. If some of the functions are non-differentiable, subdifferential versions of Karush—Kuhn—Tucker KKT conditions are available. From Wikipedia, the free encyclopedia.
Nonlinear Programming: 3rd Edition
Nonlinear Optimization. Optimization : Algorithms , methods , and heuristics. Unconstrained nonlinear. Golden-section search Interpolation methods Line search Nelder—Mead method Successive parabolic interpolation. Trust region Wolfe conditions.
Mixed-integer nonlinear programming | SpringerLink
Newton's method. Constrained nonlinear.
Barrier methods Penalty methods. Augmented Lagrangian methods Sequential quadratic programming Successive linear programming. Convex optimization. Cutting-plane method Reduced gradient Frank—Wolfe Subgradient method. Affine scaling Ellipsoid algorithm of Khachiyan Projective algorithm of Karmarkar. Simplex algorithm of Dantzig Revised simplex algorithm Criss-cross algorithm Principal pivoting algorithm of Lemke.
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