arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.06378cs.LGcs.SI
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线性阈值模型下的在线影响力最大化

Online Influence Maximization under Linear Threshold Model

Shanghai Jiao Tong University(上海交通大学);Microsoft Research(微软研究院)

Shuai Li, Fang Kong, Kejie Tang, Qizhi Li, Wei Chen

摘要:

在线影响力最大化(OIM)是社交网络中的一个热门问题,它需要学习影响力传播模型参数,同时最大化影响力传播。以往的研究主要集中在边缘反馈下的独立级联模型。在本文中,我们解决OIM的线性阈值(LT)模型。由于LT模型中的节点激活是由于所有活跃邻居的聚合效应,因此使用节点级反馈来建模OIM更自然。这给在线学习带来了新的挑战,因为我们只能观察到节点组的聚集效应,而且组也是随机的。基于节点激活的线性结构,我们结合线性强盗的思想,设计了一个算法LT-LinUCB,它与观察到的反馈是一致的。通过证明群观测调制(GOM)有界光滑性,给出了一个$\tilde{O}(\mathrm{poly}(m)\sqrt{T})$阶的修正,其中$m$是边数,$T$是轮数.这是LT模型下OIM的第一个理论结果。最后,我们还提出了一种具有后悔界$O(\mathrm{poly}(m)\ T^{2/3})$的OIM-ETC算法,该算法与模型无关,算法简单,对在线反馈和离线计算的要求较低。

英文摘要:

Online influence maximization (OIM) is a popular problem in social networks to learn influence propagation model parameters and maximize the influence spread at the same time. Most previous studies focus on the independent cascade (IC) model under the edge-level feedback. In this paper, we address OIM in the linear threshold (LT) model. Because node activations in the LT model are due to the aggregated effect of all active neighbors, it is more natural to model OIM with the node-level feedback. And this brings new challenge in online learning since we only observe aggregated effect from groups of nodes and the groups are also random. Based on the linear structure in node activations, we incorporate ideas from linear bandits and design an algorithm LT-LinUCB that is consistent with the observed feedback. By proving group observation modulated (GOM) bounded smoothness property, a novel result of the influence difference in terms of the random observations, we provide a regret of order $\tilde{O}(\mathrm{poly}(m)\sqrt{T})$, where $m$ is the number of edges and $T$ is the number of rounds. This is the first theoretical result in such order for OIM under the LT model. In the end, we also provide an algorithm OIM-ETC with regret bound $O(\mathrm{poly}(m)\ T^{2/3})$, which is model-independent, simple and has less requirement on online feedback and offline computation.

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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