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arXiv 0811.4724math.OC
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稀疏主成分分析的广义power method

Generalized power method for sparse principal component analysis

Michel Journée, Yurii Nesterov, Peter Richtárik, Rodolphe Sepulchre

摘要:

在本文中,我们开发了一种新的方法,稀疏主成分分析(稀疏PCA)。我们提出了两个单一的单位和两个块的稀疏PCA问题的优化配方,旨在提取一个单一的稀疏占主导地位的主成分的数据矩阵,或一次多个组件,分别。虽然最初的配方涉及非凸函数,因此计算上是棘手的,我们将它们改写成一个优化程序的形式,涉及最大化的一个凸函数的紧凑设置。如果数据矩阵的列(变量)比行多得多,则搜索空间的维数会大大减少。然后,我们提出并分析了一个简单的梯度法适合的任务。看来,我们的算法具有最佳的收敛性能的情况下,无论是目标函数或可行集是强凸的,这是我们的单单位配方的情况下,可以强制执行块的情况下。最后,我们证明了一组随机和基因表达测试问题,我们的方法优于现有的算法,无论是在获得的解决方案的质量和计算速度。

英文摘要:

In this paper we develop a new approach to sparse principal component analysis (sparse PCA). We propose two single-unit and two block optimization formulations of the sparse PCA problem, aimed at extracting a single sparse dominant principal component of a data matrix, or more components at once, respectively. While the initial formulations involve nonconvex functions, and are therefore computationally intractable, we rewrite them into the form of an optimization program involving maximization of a convex function on a compact set. The dimension of the search space is decreased enormously if the data matrix has many more columns (variables) than rows. We then propose and analyze a simple gradient method suited for the task. It appears that our algorithm has best convergence properties in the case when either the objective function or the feasible set are strongly convex, which is the case with our single-unit formulations and can be enforced in the block case. Finally, we demonstrate numerically on a set of random and gene expression test problems that our approach outperforms existing algorithms both in quality of the obtained solution and in computational speed.

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。

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