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arXiv 1906.12136math.OCmath.AP
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约束变分问题凸松弛的对偶性

Duality of convex relaxations for constrained variational problems

Giovanni Fantuzzi

摘要:

我们证明了弱对偶最近两个凸松弛法之间的约束变分问题,其中的目标是一个积分泛函的最优值的边界。第一种方法,由Valmorbida等人提出(IEEE自动化学报)。Control 61(6):1649--1654,2016),用在充分光滑函数上的凸程序代替变分问题,服从逐点非负约束。第二种方法由Korda等人讨论(arXiv:1804.07565v1 [math.OC]),将变分问题松弛为缩放概率测度上的凸规划。我们还证明了这些无穷维凸规划之间的对偶性是强的,这意味着它们的最优值重合,当变分问题中的容许函数的范围和梯度被约束到有界集。对于多项式数据的变分问题,每个凸松弛的最优值可以通过求解有限维半定规划的弱对偶族来逼近。这些都是强对偶标准约束规格条件下,无论是否强对偶持有无限维水平。因此,这两种松弛方法对于计算的目的是等效的。

英文摘要:

We prove weak duality between two recent convex relaxation methods for bounding the optimal value of a constrained variational problem in which the objective is an integral functional. The first approach, proposed by Valmorbida et al. (IEEE Trans. Automat. Control 61(6):1649--1654, 2016), replaces the variational problem with a convex program over sufficiently smooth functions, subject to pointwise non-negativity constraints. The second approach, discussed by Korda et al. (arXiv:1804.07565v1 [math.OC]), relaxes the variational problem into a convex program over scaled probability measures. We also prove that the duality between these infinite-dimensional convex programs is strong, meaning that their optimal values coincide, when the range and gradients of admissible functions in the variational problem are constrained to bounded sets. For variational problems with polynomial data, the optimal values of each convex relaxation can be approximated by solving weakly dual hierarchies of finite-dimensional semidefinite programs (SDPs). These are strongly dual under standard constraint qualification conditions irrespective of whether strong duality holds at the infinite-dimensional level. Thus, the two relaxation approaches are equivalent for the purposes of computations.

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