## 抄録

The solution path of the least square problem under ℓ_{p}- regularization (0<p<1) is studied, where the Lagrangian multiplier λ due to the constraint is the parameter of the path. It is first proven that the least square solution of an unconstrained overdetermined linear system is connected with the origin, under a mild condition, by a continuous path of critical points of an _{p}-regularized squared error function. Based on this fact, it is proven that every sparsest least square solution of an underdetermined system is connected with the origin by a critical-point path. The existence theorem holds more generally for any least square solution whose support has its associated submatrix of the fat sensing matrix be full column rank. This is a sufficient condition for the existence, and allows to reduce the underdetermined problem to an overdetermined one with the off-support variable(s) nullified. A necessary condition is that the gradient of the ℓ_{p} regularizer with respect to the support variables lies in the row space of the submatrix (which is not necessarily full column rank).

本文言語 | English |
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論文番号 | 6776531 |

ページ（範囲） | 2960-2968 |

ページ数 | 9 |

ジャーナル | IEEE Transactions on Information Theory |

巻 | 60 |

号 | 5 |

DOI | |

出版ステータス | Published - 2014 5月 |

## ASJC Scopus subject areas

- 情報システム
- コンピュータ サイエンスの応用
- 図書館情報学