Abstract
The properties of multilevel optimization problems defined on a hierarchy of discretization grids can be used to define approximate secant equations, which describe the second-order behavior of the objective function. Following earlier work by Gratton and Toint (2009) we introduce a quasi-Newton method (with a linesearch) and a nonlinear conjugate gradient method that both take advantage of this new second-order information. We then present numerical experiments with these methods and formulate recommendations for their practical use.
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Gratton, S., Malmedy, V. & Toint, P.L. Using approximate secant equations in limited memory methods for multilevel unconstrained optimization. Comput Optim Appl 51, 967–979 (2012). https://doi.org/10.1007/s10589-011-9393-3
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DOI: https://doi.org/10.1007/s10589-011-9393-3