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Résultat de recherche 1977 2018

Filtre
Article de travail
2018

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
2017

A note on using performance and data profiles for training algorithms

Porcelli, M. & Toint, P. 26 nov. 2017 (Soumis) Arxiv, 8 p.(naXys technical report)

Résultats de recherche: Papier de travailArticle de travail

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Training Algorithm
Benchmarking
Derivatives
Derivative-free
Profile

Improved second-order evaluation complexity for unconstrained nonlinear optimization using high-order regularized models

Cartis, C., Gould, N. I. M. & Toint, P. août 2017 Arxiv

Résultats de recherche: Papier de travailArticle de travail

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Function evaluation
Unconstrained Optimization
Adaptive algorithms
Nonlinear Optimization
Tensors

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

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Data Assimilation
Saddle
Parallel processing systems
data assimilation
parallel computing

Optimality of orders one to three and beyond: characterization and evaluation complexity in constrained nonconvex optimization

Cartis, C., Gould, N. I. M. & Toint, P. 17 mai 2017 (Soumis) Arxiv

Résultats de recherche: Papier de travailArticle de travail

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Nonconvex Optimization
Constrained optimization
Constrained Optimization
Optimality
Criticality

Partially separable convexly-constrained optimization with non-Lipschitzian singularities and its complexity

Chen, X., Toint, P. & Wang, H. 24 avr. 2017 Arxiv

Résultats de recherche: Papier de travailArticle de travail

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Constrained optimization
Constrained Optimization
Singularity
Objective function
Regularization

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

Evaluation complexity bounds for smooth constrained nonlinear optimization using scaled KKT conditions and high-order models

Cartis, C., Gould, N. I. M. & Toint, P. 17 oct. 2015 (Soumis) Namur center for complex systems, 20 p.(naXys technical report)

Résultats de recherche: Papier de travailArticle de travail

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KKT Conditions
Constrained Optimization
Nonlinear Optimization
Higher Order
Derivatives

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
Higher Order
Local Minimizer
Vector-valued Functions
Taylor series

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

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

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

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