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math.OC2026
Constrained Variable Projection for Structured Problems
Emanuele Zangrando, Sara Venturini, Francesco Rinaldi +1
Variable projection is a classical technique for separable nonlinear least-squares problems, in which variables that enter linearly are eliminated exactly, yielding a reduced nonli…
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…