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arXiv 2202.08489math.OCcs.DS
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一种快速的平方和内点法Optimization

A Faster Interior-Point Method for Sum-of-Squares Optimization

Shunhua Jiang, Bento Natura, Omri Weinstein

摘要:

我们提出了一个更快的内点法优化平方和(SOS)多项式,这是一个中心工具,多项式优化和捕获凸规划的拉萨尔层次。令$p = \sum_i q^2_i$是次数为$2d$的$n$变量SOS多项式。用$L := \binom{n+d}{d}$和$U := \binom{n+2d}{2d}$分别表示$q_i$和$p$所处的向量空间的维数,我们的算法在时间上运行$\tilde{O}(LU^{1.87})$。这是多项式比最先进的SOS和半定编程求解器,实现运行时$\tilde{O}(L^{0.5}\min\{U^{2.37}, L^{4.24}\})$。我们的算法的核心是一个动态的数据结构,用于维护多项式插值基础下的SOS障碍函数的Hessian的逆,这有效地扩展到多变量SOS优化,并需要保持谱近似的低秩扰动的elementwise(Hadamard)产品。这是主要的挑战和背离最近IPM突破使用逆维护,其中低秩更新松弛矩阵容易意味着相同的海森矩阵。

英文摘要:

We present a faster interior-point method for optimizing sum-of-squares (SOS) polynomials, which are a central tool in polynomial optimization and capture convex programming in the Lasserre hierarchy. Let $p = \sum_i q^2_i$ be an $n$-variate SOS polynomial of degree $2d$. Denoting by $L := \binom{n+d}{d}$ and $U := \binom{n+2d}{2d}$ the dimensions of the vector spaces in which $q_i$'s and $p$ live respectively, our algorithm runs in time $\tilde{O}(LU^{1.87})$. This is polynomially faster than state-of-art SOS and semidefinite programming solvers, which achieve runtime $\tilde{O}(L^{0.5}\min\{U^{2.37}, L^{4.24}\})$. The centerpiece of our algorithm is a dynamic data structure for maintaining the inverse of the Hessian of the SOS barrier function under the polynomial interpolant basis, which efficiently extends to multivariate SOS optimization, and requires maintaining spectral approximations to low-rank perturbations of elementwise (Hadamard) products. This is the main challenge and departure from recent IPM breakthroughs using inverse-maintenance, where low-rank updates to the slack matrix readily imply the same for the Hessian matrix.

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