Sparse principal component of a rank-deficient matrix

Sparse principal component of a rank-deficient matrix
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DOI:
10.1109/isit.2011.6034216
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发表时间:
2011-06
期刊:
2011 IEEE International Symposium on Information Theory Proceedings
影响因子:
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通讯作者:
Megasthenis Asteris;Dimitris Papailiopoulos;G. N. Karystinos
Megasthenis Asteris;Dimitris Papailiopoulos;G. N. Karystinos
中科院分区:
其他
文献类型:
--
作者:
Megasthenis Asteris;Dimitris Papailiopoulos;G. N. Karystinos

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本文研究秩亏矩阵的稀疏主成分的识别问题。我们引入辅助球面变量,并证明存在一组候选索引集(即,指数集的向量参数的非零元素),其大小是多项式有界的,在秩方面,并包含最佳的索引集,即索引集的非零元素的最佳解决方案。最后,我们开发了一个算法,计算最佳的稀疏主成分在多项式时间的任何稀疏度。
We consider the problem of identifying the sparse principal component of a rank-deficient matrix. We introduce auxiliary spherical variables and prove that there exists a set of candidate index-sets (that is, sets of indices to the nonzero elements of the vector argument) whose size is polynomially bounded, in terms of rank, and contains the optimal index-set, i.e. the index-set of the nonzero elements of the optimal solution. Finally, we develop an algorithm that computes the optimal sparse principal component in polynomial time for any sparsity degree.