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
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通讯作者:
Megasthenis Asteris;Dimitris Papailiopoulos;G. N. Karystinos
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文献类型:
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作者:
Megasthenis Asteris;Dimitris Papailiopoulos;G. N. Karystinos
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.