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arXiv 1811.10331math.OC
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凸规划中的Hessian黎曼梯度流

Hessian Riemannian gradient flows in convex programming

Felipe Alvarez, Jérôme Bolte, Olivier Brahic

摘要:

受约束极小化问题的启发,研究了由Legendre型凸函数诱导的关于Hessian黎曼度量的梯度流。第一个结果将凸集上的Hessian Riemann结构刻画为对变分不等式具有特定积分性质的度量,为Bregman型距离的引入提供了新的动力.然后,引入一般发展问题,给出了一个微分包含形式。在拟凸性条件下证明了该方法的一般存在性,并建立了其整体收敛性,在凸极小化条件下得到了有趣的改进。这些梯度流的一些显式的例子进行了讨论。对一类具有正性和等式约束的凸规划,给出了对偶轨线的确定和对偶收敛的充分条件。一些收敛速度的结果。在线性目标函数的情况下,给出了轨道的几个最优性特征:粘性方法的最优路径,Bregman型邻近算法的连续时间模型,适当度量的测地线,Lagrange方程和完全可积哈密顿系统的$\dot q$ -轨道的投影.

英文摘要:

Motivated by a constrained minimization problem, it is studied the gradient flows with respect to Hessian Riemannian metrics induced by convex functions of Legendre type. The first result characterizes Hessian Riemannian structures on convex sets as those metrics that have a specific integration property with respect to variational inequalities, giving a new motivation for the introduction of Bregman-type distances. Then, the general evolution problem is introduced and a differential inclusion reformulation is given. A general existence result is proved and global convergence is established under quasi-convexity conditions, with interesting refinements in the case of convex minimization. Some explicit examples of these gradient flows are discussed. Dual trajectories are identified and sufficient conditions for dual convergence are examined for a convex program with positivity and equality constraints. Some convergence rate results are established. In the case of a linear objective function, several optimality characterizations of the orbits are given: optimal path of viscosity methods, continuous-time model of Bregman-type proximal algorithms, geodesics for some adequate metrics and projections of $\dot q$-trajectories of some Lagrange equations and completely integrable Hamiltonian systems.

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