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arXiv 2103.12931math.OC
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线性等式约束凸最优化问题的“二阶原始”+“一阶对偶”时标动力系统

"Second-Order Primal'' + "First-Order Dual'' Dynamical Systems with Time Scaling for Linear Equality Constrained Convex Optimization Problems

Xin He, Rong Hu, Ya-Ping Fang

摘要:

二阶动力系统是求解最优化问题的重要工具,现有的研究主要集中在无约束最优化问题上。针对线性等式约束凸优化问题,提出了一个具有常粘性阻尼和时间尺度的惯性原-对偶动力系统,它由原变量的二阶常微分方程和对偶变量的一阶常微分方程组成.当尺度变换满足一定条件时,在不假设强凸性的情况下,证明了它的收敛性。当缩放指数增长时,甚至收敛速度也可以变成指数。我们还证明了所得到的动力系统的收敛性在小扰动下是保持的。

英文摘要:

Second-order dynamical systems are important tools for solving optimization problems, and most of existing works in this field have focused on unconstrained optimization problems. In this paper, we propose an inertial primal-dual dynamical system with constant viscous damping and time scaling for the linear equality constrained convex optimization problem, which consists of a second-order ODE for the primal variable and a first-order ODE for the dual variable. When the scaling satisfies certain conditions, we prove its convergence property without assuming strong convexity. Even the convergence rate can become exponential when the scaling grows exponentially. We also show that the obtained convergence property of the dynamical system is preserved under a small perturbation.

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