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arXiv 1902.01632cs.LGstat.ML
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最小描述长度作为非负矩阵分解的目标函数

Minimum description length as an objective function for non-negative matrix factorization

University of Southampton(南安普顿大学)

Steven Squires, Adam Prugel Bennett, Mahesan Niranjan

摘要:

非负矩阵分解(NMF)是一种降维技术,它倾向于产生数据的稀疏表示。通常,实际矩阵和重建矩阵之间的误差被用作目标函数,但这种方法可能不会产生我们想要的表示类型,因为它允许模型的复杂性增长,仅受子空间大小和非负性要求的约束。如果施加额外的约束,如稀疏性,参数选择的问题变得至关重要。而不是增加稀疏性约束,在特设的方式,我们提出了一种新的目标函数,通过使用最小描述长度(MDL)的原则。我们的公式,MDL-NMF,自动权衡模型的复杂性和准确性之间的原则性的方法,几乎没有参数选择或需要领域的专业知识。我们证明了我们的模型有效地工作在三个异构的数据集和一系列的半合成数据显示我们的方法的广泛适用性。

英文摘要:

Non-negative matrix factorization (NMF) is a dimensionality reduction technique which tends to produce a sparse representation of data. Commonly, the error between the actual and recreated matrices is used as an objective function, but this method may not produce the type of representation we desire as it allows for the complexity of the model to grow, constrained only by the size of the subspace and the non-negativity requirement. If additional constraints, such as sparsity, are imposed the question of parameter selection becomes critical. Instead of adding sparsity constraints in an ad-hoc manner we propose a novel objective function created by using the principle of minimum description length (MDL). Our formulation, MDL-NMF, automatically trades off between the complexity and accuracy of the model using a principled approach with little parameter selection or the need for domain expertise. We demonstrate our model works effectively on three heterogeneous data-sets and on a range of semi-synthetic data showing the broad applicability of our method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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