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arXiv 1511.02402cs.LG
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极大和多样化、单调子模函数与半度量空间

Max-Sum Diversification, Monotone Submodular Functions and Semi-metric Spaces

Sharif University of Technology(谢里夫理工大学)

Sepehr Abbasi Zadeh, Mehrdad Ghadiri

摘要:

在许多应用中,如基于Web的搜索,文档摘要,设施定位和其他应用中,结果是最好的是既有代表性的和多样化的文档子集。本研究的目标是选择一个良好的“质量”,有界大小的子集的一组给定的项目,同时保持其多样性相对于一个半度量距离函数。这个问题首先由Borodin等人\cite{borodin}研究,但在他们的证明中使用的一个关键性质是三角不等式。在这个修改的证明中,我们想放松三角不等式,并将最大和多样化问题的逼近比与问题的范式中的放松三角不等式的参数联系起来(即,一个均匀拟阵)和任意拟阵。

英文摘要:

In many applications such as web-based search, document summarization, facility location and other applications, the results are preferable to be both representative and diversified subsets of documents. The goal of this study is to select a good "quality", bounded-size subset of a given set of items, while maintaining their diversity relative to a semi-metric distance function. This problem was first studied by Borodin et al\cite{borodin}, but a crucial property used throughout their proof is the triangle inequality. In this modified proof, we want to relax the triangle inequality and relate the approximation ratio of max-sum diversification problem to the parameter of the relaxed triangle inequality in the normal form of the problem (i.e., a uniform matroid) and also in an arbitrary matroid.

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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