计算机科学 ›› 2024, Vol. 51 ›› Issue (3): 118-127.doi: 10.11896/jsjkx.221200054
潘磊1, 刘欣2, 陈君益2, 程章桃2, 刘乐源2, 周帆2,3
PAN Lei1, LIU Xin2, CHEN Junyi2, CHENG Zhangtao2, LIU Leyuan2, ZHOU Fan2,3
摘要: 事件指在真实世界中特定的时间和地点发生的与特定主题相关的活动,例如,社会动乱、暴恐袭击、自然灾害和传染病流行等事件会对国家安全和人民群众的生活产生重大威胁。如果能对此类事件的发生进行有效预测,将最大程度地减少负面事件带来的影响或最大化正面事件带来的利益。关于事件的研究中,准确预测事件仍然是一个非常具有挑战性的任务。文中提出了一种基于图注意力网络的事件预测方法LAT-GAT(Local Augmented Temporal-GAT),该方法使用条件变分编码器,在所构建的事件图中对目标节点的邻居节点生成新的特征样本,与节点原有特征进行拼合,形成新的节点特征,实现了对事件的传播结构的利用;另外,LAT-GAT还考虑了历史事件发生的时间先后顺序,将网络在上一时间点的输出结果集成到当前时间的特征中,从而实现了对事件传播时间特性的利用。最后,在泰国、印度、埃及和俄罗斯这4个国家真实事件数据集上,与多种代表性基线方法进行了对比实验。实验结果表明,LAT-GAT在4个国家数据上的F1评分都优于基线方法;在泰国、俄罗斯和印度数据集上召回率优于基线方法;在泰国、埃及和印度数据集上也获得了最高的准确率。还通过消融实验考察了模型参数对最终结果的影响。
中图分类号:
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