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arXiv 1804.02571math.OC
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具有线性收敛的非凸近似增量聚合梯度法

Nonconvex Proximal Incremental Aggregated Gradient Method with Linear Convergence

Wei Peng, Hui Zhang, Xiaoya Zhang

摘要:

本文研究了极小化L-光滑非凸分量函数与适当的闭凸函数之和的邻近增量聚集梯度算法。利用L-光滑性质和误差界条件,我们可以证明即使对于非凸极小化问题,PIAG方法仍然具有良好的线性收敛性质.为了说明这一点,我们首先证明了生成的序列全局收敛到平稳点集。然后,存在一个阈值,使得当步长小于该阈值时,目标函数值序列和目标点序列都是R-线性收敛的。

英文摘要:

In this paper, we study the proximal incremental aggregated gradient(PIAG) algorithm for minimizing the sum of L-smooth nonconvex component functions and a proper closed convex function. By exploiting the L-smooth property and with the help of an error bound condition, we can show that the PIAG method still enjoys some nice linear convergence properties even for nonconvex minimization. To illustrate this, we first demonstrate that the generated sequence globally converges to the stationary point set. Then, there exists a threshold such that the objective function value sequence and the iterate point sequence are R-linearly convergent when the stepsize is chosen below this threshold.

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