arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0905.1643math.OCcs.ITmath.IT
收藏

矩阵秩最小化问题的不动点和Bregman迭代法

Fixed Point and Bregman Iterative Methods for Matrix Rank Minimization

Shiqian Ma, Donald Goldfarb, Lifeng Chen

摘要:

仿射限制条件下的低秩矩阵的恢复问题广泛地出现在控制、信号处理及系统识别等许多领域中.该问题的最紧凸松弛是线性约束核范数最小化。虽然后者可以被看作是半定规划问题,但当矩阵很大时,这种方法的求解在计算上是昂贵的。本文提出了求解核范数最小化问题的不动点算法和Bregman迭代算法,并证明了第一种算法的收敛性.通过使用同伦方法和近似奇异值分解过程,我们得到了一个非常快速、鲁棒和强大的算法,我们称之为FPCA(不动点Continuation with Approximate SVD),它可以解决非常大的矩阵秩最小化问题。在随机生成矩阵和实矩阵完备化问题上的数值结果表明,与SDPT 3等半定规划求解器相比,该算法具有更快的速度和更好的可恢复性.例如,我们的算法可以在大约3分钟内恢复秩为50的1000 × 1000个矩阵,并且通过仅采样20%的元素,相对误差为1 e-5。据我们所知,没有其他方法可以实现如此好的可恢复性。在在线推荐、DNA微阵列数据集和图像修复问题上的数值实验验证了算法的有效性.

英文摘要:

The linearly constrained matrix rank minimization problem is widely applicable in many fields such as control, signal processing and system identification. The tightest convex relaxation of this problem is the linearly constrained nuclear norm minimization. Although the latter can be cast as a semidefinite programming problem, such an approach is computationally expensive to solve when the matrices are large. In this paper, we propose fixed point and Bregman iterative algorithms for solving the nuclear norm minimization problem and prove convergence of the first of these algorithms. By using a homotopy approach together with an approximate singular value decomposition procedure, we get a very fast, robust and powerful algorithm, which we call FPCA (Fixed Point Continuation with Approximate SVD), that can solve very large matrix rank minimization problems. Our numerical results on randomly generated and real matrix completion problems demonstrate that this algorithm is much faster and provides much better recoverability than semidefinite programming solvers such as SDPT3. For example, our algorithm can recover 1000 x 1000 matrices of rank 50 with a relative error of 1e-5 in about 3 minutes by sampling only 20 percent of the elements. We know of no other method that achieves as good recoverability. Numerical experiments on online recommendation, DNA microarray data set and image inpainting problems demonstrate the effectiveness of our algorithms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑