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Résultat de recherche 1977 2019

Filtre
Article de travail
2019

An algorithm for optimization with disjoint linear constraints and its application for predicting rain

Janjic, T., Ruckstuhl, Y. & Toint, P., 12 sept. 2019, Arxiv.

Résultats de recherche: Papier de travailArticle de travail

File
Rain
Weather forecasting
Costs
10 Downloads (Pure)

Bernstein Concentration Inequalities for Tensors via Einstein Products

Luo, Z., Qi, L. & Toint, P., 11 févr. 2019, Arxiv, 12 p.

Résultats de recherche: Papier de travailArticle de travail

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Bernstein Inequality
Concentration Inequalities
Albert Einstein
Tensors
Tensor

Exploiting variable precision in GMRES

Gratton, S., Simon, E., Titley-Peloquin, D. & Toint, P., juil. 2019, 19 p.

Résultats de recherche: Papier de travailArticle de travail

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GMRES
Digital arithmetic
Arnoldi
Iterative Solver
Floating-point Arithmetic
7 Downloads (Pure)

High-Order Evaluation Complexity for Convexly-Constrained Optimization with Non-Lipschitzian Group Sparsity Terms

Chen, X. & Toint, P., 28 févr. 2019, Arxiv, p. 1-27, 27 p.

Résultats de recherche: Papier de travailArticle de travail

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Constrained optimization
Constrained Optimization
Sparsity
Higher Order
Evaluation
2 Downloads (Pure)

Minimization of nonsmooth nonconvex functions using inexact evaluations and its worst-case complexity

Gratton, S., Simon, E. & Toint, P., févr. 2019, Arxiv, 19 p.

Résultats de recherche: Papier de travailArticle de travail

File
Derivatives
Evaluation
Adaptive algorithms
Nonconvex Minimization
Inexact Methods
2018
1 Downloads (Pure)

A note on solving nonlinear optimization problems in variable precision

Gratton, S. & Toint, P., 11 déc. 2018, Arxiv, 11 p.

Résultats de recherche: Papier de travailArticle de travail

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Function evaluation
Energy dissipation
Costs
Experiments
11 Downloads (Pure)

Minimizing convex quadratics with variable precision Krylov methods

Gratton, S., Simon, E. & Toint, P., 2018, (Soumis) Arxiv, 26 p.

Résultats de recherche: Papier de travailArticle de travail

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Krylov Methods
Quadratic Optimization
Cross product
Matrix Product
Conjugate Gradient

Sharp worst-case evaluation complexity bounds for arbitrary-order nonconvex optimization with inexpensive constraints

Cartis, C., Gould, N. I. M. & Toint, P., 3 nov. 2018, Arxiv, 30 p.

Résultats de recherche: Papier de travailArticle de travail

File
Derivatives
Costs
2017
2 Downloads (Pure)

On the use of the saddle formulation in weakly-constrained 4D-VAR data assimilation

Gratton, S., Gürol, S., Simon, E. & Toint, P., 20 sept. 2017, (Soumis) Arxiv.

Résultats de recherche: Papier de travailArticle de travail

File
Data Assimilation
Saddle
Parallel processing systems
data assimilation
parallel computing
19 Downloads (Pure)

Worst-case evaluation complexity and optimality of second-order methods for nonconvex smooth optimization

Cartis, C., Gould, N. I. M. & Toint, P., 22 sept. 2017, Arxiv, 35 p.

Résultats de recherche: Papier de travailArticle de travail

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Newton-Raphson method
Optimality
Optimization
Function evaluation
Evaluation
2015
24 Downloads (Pure)

Improved worst-case evaluation complexity for potentially rank-deficient nonlinear least-Euclidean-norm problems using higher-order regularized models

Cartis, C., Gould, N. I. M. & Toint, P., 18 nov. 2015, 18 p. (naXys technical report).

Résultats de recherche: Papier de travailArticle de travail

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Euclidean norm
Local Minimizer
Vector-valued Functions
Taylor series
Criticality
9 Downloads (Pure)

Worst-case evaluation complexity for unconstrained nonlinear optimization using high-order regularized models

Birgin, E., Gardenghi, J., Martinez, J-M., Santos, S. A. & Toint, P., juin 2015, 2015: Namur center for complex systems, 8 p. (naXys Technical Reports; Vol 05-2015).

Résultats de recherche: Papier de travailArticle de travail

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Unconstrained Optimization
Nonlinear Optimization
Higher Order
Derivatives
Derivative
2014
116 Downloads (Pure)

An Interior-Point Trust-Funnel Algorithm for Nonlinear Optimization using a Squared-Violation Feasibility Measure

Curtis, F., Gould, N. I. M., Robinson, D. & Toint, P., 2 janv. 2014, Rutherford Appleton Laboratory, 43 p.

Résultats de recherche: Papier de travailArticle de travail

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Interior Point
Nonlinear Optimization
Matrix Derivative
Merit Function
Quadratic Optimization
2013
12 Downloads (Pure)

Adaptive Observations And Multilevel Optimization In Data Assimilation

Gratton, S., Rincon-Camacho, M. & Toint, P., 2013, Namur: Namur center for complex systems, 18 p.

Résultats de recherche: Papier de travailArticle de travail

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data assimilation
decomposition
wave equation
weather
prediction
63 Downloads (Pure)

An example of slow convergence for Newton's method on a function with globally Lipschitz continuous Hessian

Cartis, C., Gould, N. I. M. & Toint, P., 5 mai 2013, Namur center for complex systems, 9 p.

Résultats de recherche: Papier de travailArticle de travail

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Unconstrained Minimization
Steepest Descent Method
Evaluation Function
Terminate
Iterate