论文标题

探索低度节点首先加速网络探索

Exploring Low-degree Nodes First Accelerates Network Exploration

论文作者

Costantini, Stefania, De Meo, Pasquale, Giorgianni, Angelo, Migliorato, Valentina, Provetti, Alessandro, Salvia, Federico

论文摘要

我们考虑了类似Web的网络上的信息扩散以及随机步行如何模拟它。该域中的一个充分研究的问题是部分覆盖时间,即,随机助行器需要访问网络节点的给定部分的预期步骤数量。我们注意到,一些最快的解决方案实际上要求节点对邻居的程度分配有完美的了解,在许多实际情况下,出于隐私原因,这些邻居无法获得。因此,我们介绍了考虑此类限制的封面问题的版本:预算的部分覆盖时间。预算是对可以检查其学位的邻居数量的限制;我们已经适应了从文献的最佳随机步行策略,以在此预算下运作。我们的解决方案称为最低度(MD),从本质上讲,它首先将随机的步行者偏向访问网络的外围区域。在六个真实数据集上进行广泛的基准测试证明 - 可能的违反直觉策略 - MD策略实际上是高度竞争性的WRT。封面的最新算法。

We consider information diffusion on Web-like networks and how random walks can simulate it. A well-studied problem in this domain is Partial Cover Time, i.e., the calculation of the expected number of steps a random walker needs to visit a given fraction of the nodes of the network. We notice that some of the fastest solutions in fact require that nodes have perfect knowledge of the degree distribution of their neighbors, which in many practical cases is not obtainable, e.g., for privacy reasons. We thus introduce a version of the Cover problem that considers such limitations: Partial Cover Time with Budget. The budget is a limit on the number of neighbors that can be inspected for their degree; we have adapted optimal random walks strategies from the literature to operate under such budget. Our solution is called Min-degree (MD) and, essentially, it biases random walkers towards visiting peripheral areas of the network first. Extensive benchmarking on six real datasets proves that the---perhaps counter-intuitive strategy---MD strategy is in fact highly competitive wrt. state-of-the-art algorithms for cover.

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