Výsledky vyhledávání - "Berglund Erik"

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Novel Limited Memory Quasi-Newton Methods Based On Optimal Matrix Approximation

Autor: Berglund, Erik, Johansson, Mikael

Update formulas for the Hessian approximations in quasi-Newton methods such as BFGS can be derived as analytical solutions to certain nearest-matrix problems. In this article, we propose a similar idea for deriving new limited memory versions of quas

Externí odkaz: http://arxiv.org/abs/2403.02860

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Soft quasi-Newton: Guaranteed positive definiteness by relaxing the secant constraint

Autor: Berglund, Erik, Zhang, Jiaojiao, Johansson, Mikael

We propose a novel algorithm, termed soft quasi-Newton (soft QN), for optimization in the presence of bounded noise. Traditional quasi-Newton algorithms are vulnerable to such perturbations. To develop a more robust quasi-Newton method, we replace th

Externí odkaz: http://arxiv.org/abs/2403.02448

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Zeroth-Order Randomized Subspace Newton Methods

Autor: Berglund, Erik, Khirirat, Sarit, Wang, Xiaoyu

Zeroth-order methods have become important tools for solving problems where we have access only to function evaluations. However, the zeroth-order methods only using gradient approximations are $n$ times slower than classical first-order methods for

Externí odkaz: http://arxiv.org/abs/2202.04612

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Akademický článek

Electrical short-circuit in β-cells from a patient with non-insulinoma pancreatogenous hypoglycemic syndrome (NIPHS): a case report

Autor: Grimelius Lars, Höög Anders, Curman Pontus, Forsberg Lars, Berglund Erik, Bränström Robert, Berggren Per-Olof, Mattsson Per, Hellman Per, Juntti-Berggren Lisa

Publikováno v: Journal of Medical Case Reports, Vol 4, Iss 1, p 315 (2010)

Abstract Introduction Non-insulinoma pancreatogenous hypoglycemic syndrome is a rare disorder among adults, and, to our knowledge, only about 40 cases have been reported in the literature. Case presentation The patient is a previously healthy 35-year

Externí odkaz: https://doaj.org/article/845aaf0efef946498ff44d3d7cd5150e