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arXiv 1802.04189cs.SI
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多轮影响力最大化

Multi-Round Influence Maximization

Lichao Sun, Weiran Huang, Philip S. Yu, Wei Chen

摘要:

在本文中,我们研究了多轮影响力最大化(MRIM)问题,其中影响力在多轮中独立地从可能不同的种子集传播,目标是为每轮选择种子,以最大化在至少一轮中被激活的节点的预期数量。MRIM问题模拟了病毒式营销场景,在这种场景中,广告商进行多轮病毒式营销来推广一种产品。我们考虑两种不同的设置:1)非自适应MRIM,其中广告商需要在一开始就确定所有轮次的种子集,以及2)自适应MRIM,其中广告商可以基于前几轮中的传播结果自适应地选择种子集。对于非自适应设置,我们设计了两个算法,表现出一个有趣的效率和有效性之间的权衡:一个跨轮贪心算法,在全球范围内选择种子,实现$1/2 - \varepsilon$近似比,和一个轮内的贪心算法,选择种子轮,实现$1-e^{-(1-1/e)}-\varepsilon \approx 0.46 - \varepsilon$近似比,但节省运行时间的一个因素有关的轮数。对于自适应设置,我们设计了一个自适应算法,保证$1-e^{-(1-1/e)}-\varepsilon$逼近自适应最优解。在所有情况下,我们进一步设计可扩展的算法的基础上的反向影响采样方法,并实现近线性的运行时间。我们在几个真实世界的网络上进行实验,并证明我们的算法是有效的MRIM任务。

英文摘要:

In this paper, we study the Multi-Round Influence Maximization (MRIM) problem, where influence propagates in multiple rounds independently from possibly different seed sets, and the goal is to select seeds for each round to maximize the expected number of nodes that are activated in at least one round. MRIM problem models the viral marketing scenarios in which advertisers conduct multiple rounds of viral marketing to promote one product. We consider two different settings: 1) the non-adaptive MRIM, where the advertiser needs to determine the seed sets for all rounds at the very beginning, and 2) the adaptive MRIM, where the advertiser can select seed sets adaptively based on the propagation results in the previous rounds. For the non-adaptive setting, we design two algorithms that exhibit an interesting tradeoff between efficiency and effectiveness: a cross-round greedy algorithm that selects seeds at a global level and achieves $1/2 - \varepsilon$ approximation ratio, and a within-round greedy algorithm that selects seeds round by round and achieves $1-e^{-(1-1/e)}-\varepsilon \approx 0.46 - \varepsilon$ approximation ratio but saves running time by a factor related to the number of rounds. For the adaptive setting, we design an adaptive algorithm that guarantees $1-e^{-(1-1/e)}-\varepsilon$ approximation to the adaptive optimal solution. In all cases, we further design scalable algorithms based on the reverse influence sampling approach and achieve near-linear running time. We conduct experiments on several real-world networks and demonstrate that our algorithms are effective for the MRIM task.

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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