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arXiv 1306.6419math.OC
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不含Compactness的凸多项式规划的SDP松弛的Lasserre族的收敛性

Convergence of the Lasserre Hierarchy of SDP Relaxations for Convex Polynomial Programs without Compactness

V. Jeyakumar, T. S. Pham, G. Li

摘要:

半定规划(SDP)松弛的Lasserre层次是一个有效的计划,寻找计算上可行的多项式优化的SDP近似紧半代数集。在本文中,我们表明,凸多项式优化,Lasserre层次与一个稍微扩展的二次模总是渐近收敛,即使在面对非紧的半代数可行集。我们这样做,利用凸多项式的bavity属性,下面有界。我们进一步建立,在鞍点(而不是在每个极小的目标函数)的相关拉格朗日的Hessian的正定性保证有限收敛的层次。首先在鞍点条件下建立了凸半代数集上凸多项式的平方和多项式表示,得到了有限收敛性。最后,我们证明了凸多项式规划的拉格朗日量的鞍点的存在性也是该族具有有限收敛性的必要条件。

英文摘要:

The Lasserre hierarchy of semidefinite programming (SDP) relaxations is an effective scheme for finding computationally feasible SDP approximations of polynomial optimization over compact semi-algebraic sets. In this paper, we show that, for convex polynomial optimization, the Lasserre hierarchy with a slightly extended quadratic module always converges asymptotically even in the face of non-compact semi-algebraic feasible sets. We do this by exploiting a coercivity property of convex polynomials that are bounded below. We further establish that the positive definiteness of the Hessian of the associated Lagrangian at a saddle-point (rather than the objective function at each minimizer) guarantees finite convergence of the hierarchy. We obtain finite convergence by first establishing a new sum-of-squares polynomial representation of convex polynomials over convex semi-algebraic sets under a saddle-point condition. We finally prove that the existence of a saddle-point of the Lagrangian for a convex polynomial program is also necessary for the hierarchy to have finite convergence.

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