基于支持度预测的改进CS算法的递归鲁棒主成分追踪
Support-Predicted Modified-CS for Recursive Robust Principal Components' Pursuit
摘要:
本文提出了一种因果递归算法来解决“鲁棒”主成分分析(PCA)问题。我们主要关注相关离群值的鲁棒性。在最近的工作中,我们提出了一种新的方法来看待这个问题,并展示了其解决策略的关键部分如何涉及解决噪声压缩感知(CS)问题。然而,如果对于当前PC空间的给定维度,离群值的支持大小变得太大,则可用于CS的“测量”的数量可能变得太小。在这项工作中,我们展示了如何通过利用离群值的相关性来预测它们在当前时间的支持度来解决这个问题;并将其用作“部分支持度知识”来解决Modified-CS而不是CS。
英文摘要:
This work proposes a causal and recursive algorithm for solving the "robust" principal components' analysis (PCA) problem. We primarily focus on robustness to correlated outliers. In recent work, we proposed a new way to look at this problem and showed how a key part of its solution strategy involves solving a noisy compressive sensing(CS) problem. However, if the support size of the outliers becomes too large, for a given dimension of the current PC space, then the number of "measurements" available for CS may become too small. In this work, we show how to address this issue by utilizing the correlation of the outliers to predict their support at the current time; and using this as "partial support knowledge" for solving Modified-CS instead of CS.
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