论文标题
对节点嵌入鲁棒性的系统评估
A Systematic Evaluation of Node Embedding Robustness
论文作者
论文摘要
节点嵌入方法将网络节点映射到低维向量,随后可以在各种下游预测任务中使用。近年来,这些方法的普及已经显着增长,但是,它们对输入数据扰动的稳健性仍然很少了解。在本文中,我们评估了嵌入模型的经验鲁棒性,以对随机和对抗中毒攻击。我们的系统评估涵盖了基于跳过,矩阵分解和深度神经网络的代表性嵌入方法。我们比较了使用网络属性和节点标签计算的边缘添加,删除和重新布线攻击。我们还研究了流行的节点分类攻击基线的性能,该攻击基线对节点标签充分了解。我们通过嵌入可视化和定量结果来报告定性结果,以下游节点分类和网络重建性能。我们发现,节点分类结果比网络重建结果更大,基于学位和基于标签的攻击平均是最大的破坏性,并且标签异质性可以强烈影响攻击性能。
Node embedding methods map network nodes to low dimensional vectors that can be subsequently used in a variety of downstream prediction tasks. The popularity of these methods has grown significantly in recent years, yet, their robustness to perturbations of the input data is still poorly understood. In this paper, we assess the empirical robustness of node embedding models to random and adversarial poisoning attacks. Our systematic evaluation covers representative embedding methods based on Skip-Gram, matrix factorization, and deep neural networks. We compare edge addition, deletion and rewiring attacks computed using network properties as well as node labels. We also investigate the performance of popular node classification attack baselines that assume full knowledge of the node labels. We report qualitative results via embedding visualization and quantitative results in terms of downstream node classification and network reconstruction performances. We find that node classification results are impacted more than network reconstruction ones, that degree-based and label-based attacks are on average the most damaging and that label heterophily can strongly influence attack performance.