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arXiv 1604.02181stat.ML
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基于乘性更新的稀疏非负最小二乘统一框架及非负矩阵分解问题

A Unified Framework for Sparse Non-Negative Least Squares using Multiplicative Updates and the Non-Negative Matrix Factorization Problem

Igor Fedorov, Alican Nalci, Ritwik Giri, Bhaskar D. Rao, Truong Q. Nguyen, Harinath Garudadri

摘要:

研究了稀疏非负最小二乘(S-NNLS)问题。S-NNLS自然发生在各种各样的应用中,其中必须从线性测量中恢复未知的非负量。我们提出了一个统一的框架,S-NNLS的基础上整流幂指数尺度混合物之前的稀疏码。我们表明,该框架包含了一大类的S-NNLS算法,并提供了一个计算效率的推理过程的基础上乘法更新规则。这种更新规则便于同时解决大量的S-NNLS问题,这在稀疏非负矩阵分解(S-NMF)等背景下是必需的。我们提供了理论上的理由,所提出的方法表明,被优化的目标函数的局部极小值是稀疏的,并保证S-NNLS算法收敛到一组固定点的目标函数。然后,我们将我们的框架扩展到S-NMF,表明我们的框架导致许多众所周知的S-NMF算法在特定的选择之前,并提供了一个保证,一个流行的子类所提出的算法收敛到一组固定点的目标函数。最后,我们研究了所提出的方法在合成数据和真实数据上的性能。

英文摘要:

We study the sparse non-negative least squares (S-NNLS) problem. S-NNLS occurs naturally in a wide variety of applications where an unknown, non-negative quantity must be recovered from linear measurements. We present a unified framework for S-NNLS based on a rectified power exponential scale mixture prior on the sparse codes. We show that the proposed framework encompasses a large class of S-NNLS algorithms and provide a computationally efficient inference procedure based on multiplicative update rules. Such update rules are convenient for solving large sets of S-NNLS problems simultaneously, which is required in contexts like sparse non-negative matrix factorization (S-NMF). We provide theoretical justification for the proposed approach by showing that the local minima of the objective function being optimized are sparse and the S-NNLS algorithms presented are guaranteed to converge to a set of stationary points of the objective function. We then extend our framework to S-NMF, showing that our framework leads to many well known S-NMF algorithms under specific choices of prior and providing a guarantee that a popular subclass of the proposed algorithms converges to a set of stationary points of the objective function. Finally, we study the performance of the proposed approaches on synthetic and real-world data.

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