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math.OC2026
Extrapolation-based Direct Search for Nonsmooth Stochastic Zeroth-Order Optimization
Anthony Palmieri, Francesco Rinaldi, Sara Shashaani
We propose and analyze a stochastic direct-search method for unconstrained zeroth-order minimization of locally Lipschitz, possibly nonsmooth, objectives. The method combines rando…
math.OC2026
Iteration Complexity of Frank-Wolfe and Its Variants for Bilevel Optimization
Anthony Palmieri, Francesco Rinaldi, Saverio Salzo +1
We study Frank-Wolfe (FW) methods for constrained bilevel optimization when the lower-level problem is solved only approximately, yielding biased and inexact hypergradients. We ana…