A VU-algorithm for convex minimization
For convex minimization we introduce an algorithm based on VU-space decomposition. The method uses a bundle subroutine to generate a sequence of approximate proximal points. When a primal-dual track leading to a solution and zero subgradient pair exists, these points approximate the primal track points and give the algorithm's V, or corrector, steps. The subroutine also approximates dual track points that are U-gradients needed for the method's U-Newton predictor steps. With the inclusion of a simple line search the resulting algorithm is proved to be globally convergent. The convergence is superlinear if the primal-dual track points and the objective's U-Hessian are approximated well enough.
convex minimization proximal points bundle methods vu decomposition superlinear convergence