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arXiv 1802.09110cs.DS
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超图的子模性:从集合到序列

Submodularity on Hypergraphs: From Sets to Sequences

Marko Mitrovic, Moran Feldman, Andreas Krause, Amin Karbasi

摘要:

简而言之,子模函数编码了收益递减的直观概念。因此,子模块性出现在许多重要的机器学习任务中,如特征选择和数据摘要。虽然近年来有大量的工作致力于研究次模函数,但绝大多数工作都集中在输出集合而不是序列的算法上。然而,在许多设置中,我们输出项目的顺序可能与项目本身一样重要。为了将子模块性的概念扩展到序列,我们在项目上使用有向图,其中边编码以特定顺序选择项目的附加值。现有的理论是有限的情况下,这个底层图是一个有向无环图。在本文中,我们介绍了两个新的算法,可证明给常数因子近似的一般图和超图有界的内或外度。此外,我们展示了我们的新算法在电影推荐,在线链接预测和MOOC课程序列设计中的实际应用。

英文摘要:

In a nutshell, submodular functions encode an intuitive notion of diminishing returns. As a result, submodularity appears in many important machine learning tasks such as feature selection and data summarization. Although there has been a large volume of work devoted to the study of submodular functions in recent years, the vast majority of this work has been focused on algorithms that output sets, not sequences. However, in many settings, the order in which we output items can be just as important as the items themselves. To extend the notion of submodularity to sequences, we use a directed graph on the items where the edges encode the additional value of selecting items in a particular order. Existing theory is limited to the case where this underlying graph is a directed acyclic graph. In this paper, we introduce two new algorithms that provably give constant factor approximations for general graphs and hypergraphs having bounded in or out degrees. Furthermore, we show the utility of our new algorithms for real-world applications in movie recommendation, online link prediction, and the design of course sequences for MOOCs.

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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