Results 1  10
of
125
An introduction to the conjugate gradient method without the agonizing pain
, 1994
"... ..."
(Show Context)
On the Convergence of Pattern Search Algorithms
"... . We introduce an abstract definition of pattern search methods for solving nonlinear unconstrained optimization problems. Our definition unifies an important collection of optimization methods that neither computenor explicitly approximate derivatives. We exploit our characterization of pattern sea ..."
Abstract

Cited by 217 (13 self)
 Add to MetaCart
(Show Context)
. We introduce an abstract definition of pattern search methods for solving nonlinear unconstrained optimization problems. Our definition unifies an important collection of optimization methods that neither computenor explicitly approximate derivatives. We exploit our characterization of pattern search methods to establish a global convergence theory that does not enforce a notion of sufficient decrease. Our analysis is possible because the iterates of a pattern search method lie on a scaled, translated integer lattice. This allows us to relax the classical requirements on the acceptance of the step, at the expense of stronger conditions on the form of the step, and still guarantee global convergence. Key words. unconstrained optimization, convergence analysis, direct search methods, globalization strategies, alternating variable search, axial relaxation, local variation, coordinate search, evolutionary operation, pattern search, multidirectional search, downhill simplex search AMS(M...
Optimization by Direct Search: New Perspectives on Some Classical and Modern Methods
 SIAM REVIEW VOL. 45, NO. 3, PP. 385–482
, 2003
"... Direct search methods are best known as unconstrained optimization techniques that do not explicitly use derivatives. Direct search methods were formally proposed and widely applied in the 1960s but fell out of favor with the mathematical optimization community by the early 1970s because they lacked ..."
Abstract

Cited by 204 (14 self)
 Add to MetaCart
(Show Context)
Direct search methods are best known as unconstrained optimization techniques that do not explicitly use derivatives. Direct search methods were formally proposed and widely applied in the 1960s but fell out of favor with the mathematical optimization community by the early 1970s because they lacked coherent mathematical analysis. Nonetheless, users remained loyal to these methods, most of which were easy to program, some of which were reliable. In the past fifteen years, these methods have seen a revival due, in part, to the appearance of mathematical analysis, as well as to interest in parallel and distributed computing. This review begins by briefly summarizing the history of direct search methods and considering the special properties of problems for which they are well suited. Our focus then turns to a broad class of methods for which we provide a unifying framework that lends itself to a variety of convergence results. The underlying principles allow generalization to handle bound constraints and linear constraints. We also discuss extensions to problems with nonlinear constraints.
Theory of Algorithms for Unconstrained Optimization
, 1992
"... this article I will attempt to review the most recent advances in the theory of unconstrained optimization, and will also describe some important open questions. Before doing so, I should point out that the value of the theory of optimization is not limited to its capacity for explaining the behavio ..."
Abstract

Cited by 103 (1 self)
 Add to MetaCart
this article I will attempt to review the most recent advances in the theory of unconstrained optimization, and will also describe some important open questions. Before doing so, I should point out that the value of the theory of optimization is not limited to its capacity for explaining the behavior of the most widely used techniques. The question
LARGESCALE LINEARLY CONSTRAINED OPTIMIZATION
, 1978
"... An algorithm for solving largescale nonlinear ' programs with linear constraints is presented. The method combines efficient sparsematrix techniques as in the revised simplex method with stable quasiNewton methods for handling the nonlinearities. A generalpurpose production code (MINOS) is ..."
Abstract

Cited by 100 (17 self)
 Add to MetaCart
An algorithm for solving largescale nonlinear ' programs with linear constraints is presented. The method combines efficient sparsematrix techniques as in the revised simplex method with stable quasiNewton methods for handling the nonlinearities. A generalpurpose production code (MINOS) is described, along with computational experience on a wide variety of problems.
Direct search methods: Once scorned, now respectable
 PITMAN RESEARCH NOTES IN MATHEMATICS SERIES
, 1996
"... ..."
(Show Context)
Direct search methods: then and now
, 2000
"... We discuss direct search methods for unconstrained optimization. We give a modern perspective on this classical family of derivativefree algorithms, focusing on the development of direct search methods during their golden age from 1960 to 1971. We discuss how direct search methods are characterized ..."
Abstract

Cited by 83 (3 self)
 Add to MetaCart
We discuss direct search methods for unconstrained optimization. We give a modern perspective on this classical family of derivativefree algorithms, focusing on the development of direct search methods during their golden age from 1960 to 1971. We discuss how direct search methods are characterized by the absence of the construction of a model of the objective. We then consider a number of the classical direct search methods and discuss what research in the intervening years has uncovered about these algorithms. In particular, while the original direct search methods were consciously based on straightforward heuristics, more recent analysis has shown that in most — but not all — cases these heuristics actually
A Recursive Random Search Algorithm for LargeScale Network Parameter Configuration
"... Parameter configuration is a common procedure used in largescale network protocols to support multiple operational goals. This problem can be formulated as a blackbox optimization problem and solved with an efficient search algorithm. This paper proposes a new heuristic search algorithm, Recursi ..."
Abstract

Cited by 37 (7 self)
 Add to MetaCart
Parameter configuration is a common procedure used in largescale network protocols to support multiple operational goals. This problem can be formulated as a blackbox optimization problem and solved with an efficient search algorithm. This paper proposes a new heuristic search algorithm, Recursive Random Search(RRS), for largescale network parameter optimization. The RRS algorithm is based on the initial highefficiency property of random sampling and attempts to maintain this highefficiency by constantly "restarting" random sampling with adjusted sample spaces. Due to its root in random sampling, the RRS algorithm is robust to the effect of random noises in the objective function and is advantageous in optimizing the objective function with negligible parameters. These features are
LimitedMemory Matrix Methods with Applications
, 1997
"... Abstract. The focus of this dissertation is on matrix decompositions that use a limited amount of computer memory � thereby allowing problems with a very large number of variables to be solved. Speci�cally � we will focus on two applications areas � optimization and information retrieval. We introdu ..."
Abstract

Cited by 30 (6 self)
 Add to MetaCart
(Show Context)
Abstract. The focus of this dissertation is on matrix decompositions that use a limited amount of computer memory � thereby allowing problems with a very large number of variables to be solved. Speci�cally � we will focus on two applications areas � optimization and information retrieval. We introduce a general algebraic form for the matrix update in limited�memory quasi� Newton methods. Many well�known methods such as limited�memory Broyden Family meth� ods satisfy the general form. We are able to prove several results about methods which sat� isfy the general form. In particular � we show that the only limited�memory Broyden Family method �using exact line searches � that is guaranteed to terminate within n iterations on an n�dimensional strictly convex quadratic is the limited�memory BFGS method. Further� more � we are able to introduce several new variations on the limited�memory BFGS method that retain the quadratic termination property. We also have a new result that shows that full�memory Broyden Family methods �using exact line searches � that skip p updates to the quasi�Newton matrix will terminate in no more than n�p steps on an n�dimensional strictly convex quadratic. We propose several new variations on the limited�memory BFGS method
Derivative Convergence for Iterative Equation Solvers
, 1993
"... this paper, we consider two approaches to computing the desired implicitly defined derivative x ..."
Abstract

Cited by 23 (16 self)
 Add to MetaCart
(Show Context)
this paper, we consider two approaches to computing the desired implicitly defined derivative x