Abstract

We give a proximal bundle method for constrained convex optimization. It requires only evaluating the problem functions and their subgradients with an unknown accuracy $\epsilon$. Employing a combination of the classic method of centers' improvement function with an exact penalty function, it does not need a feasible starting point. It asymptotically finds points with at least $\epsilon$-optimal objective values that are $\epsilon$-feasible. When applied to the solution of linear programming problems via column generation, it allows for $\epsilon$-accurate solutions of column generation subproblems.

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