Nearly optimal stochastic approximation for online principal subspace estimation
Nearly optimal stochastic approximation for online principal subspace estimation
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在线主子空间估计的近乎最优随机逼近
DOI:
10.1007/s11425-021-1972-5
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发表时间:
2017-11
期刊:
影响因子:
--
通讯作者:
Wen-Wei Lin
中科院分区:
文献类型:
--
作者:
Xin Liang;Zhen-Chen Guo;Li Wang;Ren-Cang Li;Wen-Wei Lin
Principal component analysis (PCA) has been widely used in analyzing high-dimensional data. It converts a set of observed data points of possibly correlated variables into a set of linearly uncorrelated variables via an orthogonal transformation. To handle streaming data and reduce the complexities of PCA, (subspace) online PCA iterations were proposed to iteratively update the orthogonal transformation by taking one observed data point at a time. Existing works on the convergence of (subspace) online PCA iterations mostly focus on the case where the samples are almost surely uniformly bounded. In this paper, we analyze the convergence of a subspace online PCA iteration under more practical assumption and obtain a nearly optimal finite-sample error bound. Our convergence rate almost matches the minimax information lower bound. We prove that the convergence is nearly global in the sense that the subspace online PCA iteration is convergent with high probability for random initial guesses. This work also leads to a simpler proof of the recent work on analyzing online PCA for the first principal component only.
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DOI:
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发表时间:
2013-07
期刊:
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影响因子:
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作者:
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通讯作者:
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1991
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1996-03
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通讯作者:
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DOI:
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发表时间:
1982
期刊:
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影响因子:
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作者:
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通讯作者:
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影响因子:
1.9
作者:
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通讯作者:
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