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arXiv 0707.0705cs.AIcs.LG
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稀疏主成分分析的最优解

Optimal Solutions for Sparse Principal Component Analysis

Princeton University(普林斯顿大学);INRIA(法国国家信息与自动化研究所);Ecole Normale Supérieure(巴黎高等师范学院);U.C. Berkeley(加州大学伯克利分校)

Alexandre d'Aspremont, Francis Bach, Laurent El Ghaoui

摘要:

给定一个样本协方差矩阵,我们研究了由输入变量的线性组合解释的方差最大化的问题,同时约束在这个组合中的非零系数的数量。这被称为稀疏主成分分析,在机器学习和工程中有广泛的应用。我们制定了一个新的半定松弛这个问题,并得出一个贪心算法,计算一个完整的一组良好的解决方案,所有的目标数量的非零系数,总复杂度为O(n^3),其中n是变量的数量。然后,我们使用相同的松弛来推导解的全局最优性的充分条件,每个模式可以在O(n^3)内进行测试。我们讨论的应用程序在子集选择和稀疏恢复和人工的例子和生物数据显示,我们的算法在许多情况下提供全局最优的解决方案。

英文摘要:

Given a sample covariance matrix, we examine the problem of maximizing the variance explained by a linear combination of the input variables while constraining the number of nonzero coefficients in this combination. This is known as sparse principal component analysis and has a wide array of applications in machine learning and engineering. We formulate a new semidefinite relaxation to this problem and derive a greedy algorithm that computes a full set of good solutions for all target numbers of non zero coefficients, with total complexity O(n^3), where n is the number of variables. We then use the same relaxation to derive sufficient conditions for global optimality of a solution, which can be tested in O(n^3) per pattern. We discuss applications in subset selection and sparse recovery and show on artificial examples and biological data that our algorithm does provide globally optimal solutions in many cases.

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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