arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2106.01570cs.SI
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大型动态图上的子集节点表示学习

Subset Node Representation Learning over Large Dynamic Graphs

Xingzhi Guo, Baojian Zhou, Steven Skiena

摘要:

动态图表示学习是学习动态网络中节点嵌入的一个任务,具有许多重要的应用,包括知识图谱、引文网络、社交网络等。这种类型的图通常是大规模的,但只有一小部分顶点与下游任务相关。目前的方法对于这种设置来说太昂贵了,因为复杂度最多是线性依赖于节点和边缘的数量。在本文中,我们提出了一种新的方法,即动态个性化PageRank嵌入(\textsc{DynamicPPE})学习的目标子集的节点表示在大规模的动态网络。\textsc{DynamicPPE}基于局部节点嵌入的最新进展和动态个性化PageRank向量(PPV)的新计算,具有两个关键成分:1)每个PPV的复杂度为$\mathcal{O}(m \bar{d} / ε)$,其中$m,\bar{d}$和$ε$分别是接收到的边的数量、平均度、全局精度误差。因此,单个节点的每边事件更新平均仅依赖于$\bar{d}$;以及2)通过使用这些高质量PPV和散列核,学习的嵌入具有局部性和全局一致性的性质。这两种方法使得有效地捕捉图结构的演化成为可能。实验结果表明,该方法在大规模动态网络上的有效性和效率。我们应用\textsc{DynamicPPE}来捕捉中国城市在当前COVID-19大流行期间在维基百科图中的嵌入变化(https://en.wikipedia.org/wiki/COVID-19_pandemic)。我们的研究结果表明,这些表示成功地编码维基百科图的动态。

英文摘要:

Dynamic graph representation learning is a task to learn node embeddings over dynamic networks, and has many important applications, including knowledge graphs, citation networks to social networks. Graphs of this type are usually large-scale but only a small subset of vertices are related in downstream tasks. Current methods are too expensive to this setting as the complexity is at best linear-dependent on both the number of nodes and edges. In this paper, we propose a new method, namely Dynamic Personalized PageRank Embedding (\textsc{DynamicPPE}) for learning a target subset of node representations over large-scale dynamic networks. Based on recent advances in local node embedding and a novel computation of dynamic personalized PageRank vector (PPV), \textsc{DynamicPPE} has two key ingredients: 1) the per-PPV complexity is $\mathcal{O}(m \bar{d} / ε)$ where $m,\bar{d}$, and $ε$ are the number of edges received, average degree, global precision error respectively. Thus, the per-edge event update of a single node is only dependent on $\bar{d}$ in average; and 2) by using these high quality PPVs and hash kernels, the learned embeddings have properties of both locality and global consistency. These two make it possible to capture the evolution of graph structure effectively. Experimental results demonstrate both the effectiveness and efficiency of the proposed method over large-scale dynamic networks. We apply \textsc{DynamicPPE} to capture the embedding change of Chinese cities in the Wikipedia graph during this ongoing COVID-19 pandemic (https://en.wikipedia.org/wiki/COVID-19_pandemic). Our results show that these representations successfully encode the dynamics of the Wikipedia graph.

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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