The expressive power of Graph Neural Networks (GNNs) is often analysed via correspondence to the Weisfeiler-Leman (WL) algorithm and fragments of first-order logic. Standard GNNs are limited to performing aggregation over immediate neighbourhoods or over global read-outs. To increase their expressivity, recent attempts have been made to incorporate substructural information (e.g. cycle counts and subgraph properties). In this paper, we formalize this architectural trend by introducing Template GNNs (T-GNNs), a generalized framework where node features are updated by aggregating over valid template embeddings from a specified set of graph templates. We propose a corresponding logic, Graded template modal logic (GML(T)), and generalized notions of template-based bisimulation and WL algorithm. We establish an equivalence between the expressive power of T-GNNs and GML(T), and provide a unifying approach for analysing GNN expressivity: we show how standard AC-GNNs and its recent variants can be interpreted as instantiations of T-GNNs.
A Unifying Relational Perspective on Expressive Lottery Tickets
Faculty of Computer Science, University of Vienna(维也纳大学计算机科学学院);Doctoral School Computer Science, University of Vienna(维也纳大学计算机科学博士学院);CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences(奥地利科学院CeMM分子医学研究中心);CISPA Helmholtz Center for Information Security(CISPA亥姆霍兹信息安全中心);School of Electronic Engineering and Computer Science, Queen Mary University of London(伦敦大学玛丽女王学院电子工程与计算机科学学院);Research Network Data Science, University of Vienna(维也纳大学数据科学研究网络)
On the Rademacher Complexity of Graph Neural Networks: Unifying Expressivity and Geometry
University of Fribourg(弗里堡大学);Johns Hopkins University(约翰·霍普金斯大学);Université Paris-Saclay(巴黎萨克雷大学);University of Ferrara(费拉拉大学);Technical University of Munich(慕尼黑技术大学);University of Siena(锡耶纳大学)
School of Computing, National University of Singapore(新加坡国立大学计算学院);Institute of Data Science, National University of Singapore(新加坡国立大学数据科学研究所);Institute for Infocomm Research, A*STAR(新加坡科技研究局资讯通信研究院)
Many well-established anomaly detection methods use the distance of a sample to those in its local neighbourhood: so-called `local outlier methods', such as LOF and DBSCAN. They are popular for their simple principles and strong performance on unstructured, feature-based data that is commonplace in many practical applications. However, they cannot learn to adapt for a particular set of data due to their lack of trainable parameters. In this paper, we begin by unifying local outlier methods by showing that they are particular cases of the more general message passing framework used in graph neu…
Rational Neural Networks have Expressivity Advantages
Center for Applied Mathematics, Cornell University, United States(应用数学中心,康奈尔大学,美国);Department of Mathematics, Cornell University, United States(数学系,康奈尔大学,美国)
POSTECH(浦项科技大学);Center for Geometry and Physics, Institute for Basic Science (IBS)(基础科学研究院几何与物理中心);Korea Advanced Institute of Science and Technology (KAIST)(韩国科学技术院)
Institute for Theoretical Computer Science(理论计算机科学研究所);Leibniz University Hanover(汉诺威莱布尼茨大学);School of Computer Science(计算机科学学院);University of Sheffield(谢菲尔德大学)
TU Munich(慕尼黑工业大学);RWTH Aachen University(亚琛工业大学);University of Antwerp(安特卫普大学);University of Stuttgart(斯图加特大学)
Numerous subgraph-enhanced graph neural networks (GNNs) have emerged recently, provably boosting the expressive power of standard (message-passing) GNNs. However, there is a limited understanding of how these approaches relate to each other and to the Weisfeiler-Leman hierarchy. Moreover, current approaches either use all subgraphs of a given size, sample them uniformly at random, or use hand-crafted heuristics instead of learning to select subgraphs in a data-driven manner. Here, we offer a unified way to study such architectures by introducing a theoretical framework and extending the known …
Deep Neural Variation Spaces: A Unifying Perspective on Depth and Complexity
Department of Computer Science University of Wisconsin-Madison(计算机科学系威斯康星大学麦迪逊分校);Department of Electrical & Computer Engineering University of Wisconsin-Madison(电气与计算机工程系威斯康星大学麦迪逊分校)
Towards Unifying Diffusion Models for Probabilistic Spatio-Temporal Graph Learning
National University of Singapore(新加坡国立大学);University of Technology Sydney(悉尼科技大学);Hong Kong University of Science and Technology (Guangzhou)(香港科技大学(广州))