Bellavia, Stefania

Gratton, Serge

Morini, Benedetta

TOINT, Philippe

English

An algorithm for unconstrained non-convex optimization is described, which does not evaluate the objective function and in which minimization is carried out, at each iteration, within a randomly selected subspace. It is shown that this random approximation technique does not affect the method's convergence nor its evaluation complexity for the search of an $\epsilon$-approximate first-order critical point, which is $\mathcal{O}(\epsilon^{-(p+1)/p})$, where $p$ is the order of derivatives used. A variant of the algorithm using approximate Hessian matricesis also analyzed and shown to require at most $\mathcal{O}(\epsilon^{-2})$ evaluations.Preliminary numerical tests show that the random-subspace technique can significantly improve performance on some problems, albeit, unsurprisingly, not for all

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An optimally fast objective-function-free minimization algorithm using random subspaces

https://pure.unamur.be/ws/files/87771045/arXiv-2310.16580.pdf

An optimally fast objective-function-free minimization algorithm using random subspaces

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