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arXiv 1701.09083cs.LGcs.AI
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基于Lehmer码的有效秩聚集

Efficient Rank Aggregation via Lehmer Codes

University of Illinois at Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校);University of Massachusetts(马萨诸塞大学)

Pan Li, Arya Mazumdar, Olgica Milenkovic

摘要:

我们提出了一种新的秩聚合方法的基础上转换成相应的莱默码或其他次对角图像的排列。Lehmer码,也称为反转向量,是置换的向量表示,其中每个坐标可以取不受其他坐标值限制的值。这种变换允许坐标的解耦,并通过简单的标量中值或模式计算来执行聚合。我们目前的模拟结果表明,这种完全并行化的方法的性能和分析证明,模式和中位数聚合过程恢复正确的质心聚合时,根据著名的Mallow模型绘制的排列具有小样本的复杂性。所提出的Lehmer码方法也可以用于部分排名,具有类似的性能保证。

英文摘要:

We propose a novel rank aggregation method based on converting permutations into their corresponding Lehmer codes or other subdiagonal images. Lehmer codes, also known as inversion vectors, are vector representations of permutations in which each coordinate can take values not restricted by the values of other coordinates. This transformation allows for decoupling of the coordinates and for performing aggregation via simple scalar median or mode computations. We present simulation results illustrating the performance of this completely parallelizable approach and analytically prove that both the mode and median aggregation procedure recover the correct centroid aggregate with small sample complexity when the permutations are drawn according to the well-known Mallows models. The proposed Lehmer code approach may also be used on partial rankings, with similar performance guarantees.

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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