This paper analyzes a constrained optimization algorithm that combines an unconstrained minimization scheme like the conjugate gradient method, an augmented Lagrangian, and multiplier updates to obtain global quadratic convergence. Some of the issues that we focus on are the treatment of rigid constraints that must be satisfied during the iterations and techniques for balancing the error associated with constraint violation with the error associated with optimality. A preconditioner is constructed with the property that the rigid constraints are satisfied while ill-conditioning due to penalty terms is alleviated. Various numerical linear algebra techniques required for the efficient implementation of the algorithm are presented, and convergence behavior is illustrated in a series of numerical experiments.
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This research was supported by the National Science Foundation Grant DMS-89-03226 and by the U.S. Army Research Office Contract DAA03-89-M-0314.
We thank the referees for their many perceptive comments which led to substantial improvements in the presentation of this paper.
Communicated by E. Polak
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Hager, W.W. Analysis and implementation of a dual algorithm for constrained optimization. J Optim Theory Appl 79, 427–462 (1993). https://doi.org/10.1007/BF00940552
- Constrained optimization
- multiplier methods
- global convergence
- quadratic convergence