Publication Date: 8/16/2019
Event: The 28th International Joint Conference on Artificial Intelligence (IJCAI 2019)
Reference: pp. 3947- 3953, 2019
Authors: Dongkuan Xu, Pennsylvania State University; Wei Cheng, NEC Laboratories America, Inc.; Dongsheng Luo, Pennsylvania State University; Haifeng Chen, NEC Laboratories America, Inc.; Xiang Zhang, Pennsylvania State University
Abstract: Node classification in graph-structured data aims to classify the nodes where labels are only available for a subset of nodes. This problem has attracted considerable research efforts in recent years. In real-world applications, both graph topology and node attributes evolve over time. Existing techniques, however, mainly focus on static graphs and lack the capability to simultaneously learn both temporal and spatial/structural features. Node classification in temporal attributed graphs is challenging for two major aspects. First, effectively modeling the spatio-temporal contextual information is hard. Second, as temporal and spatial dimensions are entangled, to learn the feature representation of one target node, its desirable and challenging to differentiate the relative importance of different factors, such as different neighbors and time periods. In this paper, we propose STAR, a spatio-temporal attentive recurrent network model, to deal with the above challenges. STAR extracts the vector representation of neighborhood by sampling and aggregating local neighbor nodes. It further feeds both the neighborhood representation and node attributes into a gated recurrent unit network to jointly learn the spatio-temporal contextual information. On top of that, we take advantage of the dual attention mechanism to perform a thorough analysis on the model interpretability. Extensive experiments on real datasets demonstrate the effectiveness of the STAR model.
Publication Link: https://www.ijcai.org/proceedings/2019/548