arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.13257math.OC
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稀疏非线性规划的拉格朗日-牛顿算法

A Lagrange-Newton Algorithm for Sparse Nonlinear Programming

Chen Zhao, Naihua Xiu, Hou-Duo Qi, Ziyan Luo

摘要:

稀疏非线性规划(SNP)问题在信号与图像处理、机器学习、模式识别、金融与管理等领域有着广泛的应用。然而,由于SNP问题涉及的$\ell_0$ -范数是非凸且不连续的,其计算难度一直没有得到很好的解决。在本文中,我们解决了这个数值挑战,通过开发一个快速牛顿型算法。作为理论基石,我们建立了一个一阶最优性条件的SNP强$β$ -拉格朗日平稳性的概念的基础上,通过拉格朗日函数,并将其重新制定为一个系统的非线性方程称为拉格朗日方程。讨论了相应雅可比矩阵的非奇异性,并在此基础上提出了拉格朗日-牛顿算法(LNA)。在较弱的条件下,我们建立了LNA的局部平方收敛和迭代复杂度估计。为了进一步证明我们所提出的算法的效率和优越性,我们应用LNA来解决两个具体的应用问题所产生的压缩感知和稀疏高阶投资组合选择,其中显着的好处,从限制牛顿步骤LNA。

英文摘要:

The sparse nonlinear programming (SNP) problem has wide applications in signal and image processing, machine learning, pattern recognition, finance and management, etc. However, the computational challenge posed by SNP has not yet been well resolved due to the nonconvex and discontinuous $\ell_0$-norm involved. In this paper, we resolve this numerical challenge by developing a fast Newton-type algorithm. As a theoretical cornerstone, we establish a first-order optimality condition for SNP based on the concept of strong $β$-Lagrangian stationarity via the Lagrangian function, and reformulate it as a system of nonlinear equations called the Lagrangian equations. The nonsingularity of the corresponding Jacobian is discussed, based on which the Lagrange-Newton algorithm (LNA) is then proposed. Under mild conditions, we establish the locally quadratic convergence and the iterative complexity estimation of LNA. To further demonstrate the efficiency and superiority of our proposed algorithm, we apply LNA to solve two specific application problems arising from compressed sensing and sparse high-order portfolio selection, in which significant benefits accrue from the restricted Newton step in LNA.

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