Graph Classification

A Graph Convolutional Network, or GCN, is an approach for semi-supervised learning on graph-structured data. It is based on an efficient variant of convolutional neural networks which operate directly on graphs. The choice of convolutional architecture is motivated via a localized first-order approximation of spectral graph convolutions. The model scales linearly in the number of graph edges and learns hidden layer representations that encode both local graph structure and features of nodes.

Laplacian eigenvectors represent a natural generalization of the Transformer positional encodings (PE) for graphs as the eigenvectors of a discrete line (NLP graph) are the cosine and sinusoidal functions. They help encode distance-aware information (i.e., nearby nodes have similar positional features and farther nodes have dissimilar positional features). Hence, Laplacian Positional Encoding (PE) is a general method to encode node positions in a graph. For each node, its Laplacian PE is the k smallest non-trivial eigenvectors.

A Graph Attention Network (GAT) is a neural network architecture that operates on graph-structured data, leveraging masked self-attentional layers to address the shortcomings of prior methods based on graph convolutions or their approximations. By stacking layers in which nodes are able to attend over their neighborhoods’ features, a GAT enables (implicitly) specifying different weights to different nodes in a neighborhood, without requiring any kind of costly matrix operation (such as inversion) or depending on knowing the graph structure upfront. See here for an explanation by DGL.

GraphSAGE is a general inductive framework that leverages node feature information (e.g., text attributes) to efficiently generate node embeddings for previously unseen data. Image from: Inductive Representation Learning on Large Graphs

LightGCN is a type of graph convolutional neural network (GCN), including only the most essential component in GCN (neighborhood aggregation) for collaborative filtering. Specifically, LightGCN learns user and item embeddings by linearly propagating them on the user-item interaction graph, and uses the weighted sum of the embeddings learned at all layers as the final embedding.

Per the authors, Graph Isomorphism Network (GIN) generalizes the WL test and hence achieves maximum discriminative power among GNNs.

The ARMA GNN layer implements a rational graph filter with a recursive approximation.

Mixture model network (MoNet) is a general framework allowing to design convolutional deep architectures on non-Euclidean domains such as graphs and manifolds. Image and description from: Geometric deep learning on graphs and manifolds using mixture model CNNs

An RGCN, or Relational Graph Convolution Network, is a an application of the GCN framework to modeling relational data, specifically to link prediction and entity classification tasks. See here for an in-depth explanation of RGCNs by DGL.

Transformer neural networks have achieved state-of-the-art results for unstructured data such as text and images but their adoption for graph-structured data has been limited. This is partly due to the difficulty of incorporating complex structural information in the basic transformer framework. We propose a simple yet powerful extension to the transformer - residual edge channels. The resultant framework, which we call Edge-augmented Graph Transformer (EGT), can directly accept, process and output structural information as well as node information. It allows us to use global self-attention, the key element of transformers, directly for graphs and comes with the benefit of long-range interaction among nodes. Moreover, the edge channels allow the structural information to evolve from layer to layer, and prediction tasks on edges/links can be performed directly from the output embeddings of these channels. In addition, we introduce a generalized positional encoding scheme for graphs based on Singular Value Decomposition which can improve the performance of EGT. Our framework, which relies on global node feature aggregation, achieves better performance compared to Convolutional/Message-Passing Graph Neural Networks, which rely on local feature aggregation within a neighborhood. We verify the performance of EGT in a supervised learning setting on a wide range of experiments on benchmark datasets. Our findings indicate that convolutional aggregation is not an essential inductive bias for graphs and global self-attention can serve as a flexible and adaptive alternative.

The GATv2 operator from the “How Attentive are Graph Attention Networks?” paper, which fixes the static attention problem of the standard GAT layer: since the linear layers in the standard GAT are applied right after each other, the ranking of attended nodes is unconditioned on the query node. In contrast, in GATv2, every node can attend to any other node. GATv2 scoring function: $e_{i,j} =\mathbf{a}^{\top}\mathrm{LeakyReLU}\left(\mathbf{W}[\mathbf{h}_i \, \Vert \,\mathbf{h}_j]\right)$

DiffPool is a differentiable graph pooling module that can generate hierarchical representations of graphs and can be combined with various graph neural network architectures in an end-to-end fashion. DiffPool learns a differentiable soft cluster assignment for nodes at each layer of a deep GNN, mapping nodes to a set of clusters, which then form the coarsened input for the next GNN layer. Description and image from: Hierarchical Graph Representation Learning with Differentiable Pooling

GCNII is an extension of a Graph Convolution Networks with two new techniques, initial residual and identify mapping, to tackle the problem of oversmoothing -- where stacking more layers and adding non-linearity tends to degrade performance. At each layer, initial residual constructs a skip connection from the input layer, while identity mapping adds an identity matrix to the weight matrix.

Principal Neighbourhood Aggregation (PNA) is a general and flexible architecture for graphs combining multiple aggregators with degree-scalers (which generalize the sum aggregator).

Graph Contrastive Coding is a self-supervised graph neural network pre-training framework to capture the universal network topological properties across multiple networks. GCC's pre-training task is designed as subgraph instance discrimination in and across networks and leverages contrastive learning to empower graph neural networks to learn the intrinsic and transferable structural representations.

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Social media are nowadays one of the main news sources for millions of people around the globe due to their low cost, easy access and rapid dissemination. This however comes at the cost of dubious trustworthiness and significant risk of exposure to 'fake news', intentionally written to mislead the readers. Automatically detecting fake news poses challenges that defy existing content-based analysis approaches. One of the main reasons is that often the interpretation of the news requires the knowledge of political or social context or 'common sense', which current NLP algorithms are still missing. Recent studies have shown that fake and real news spread differently on social media, forming propagation patterns that could be harnessed for the automatic fake news detection. Propagation-based approaches have multiple advantages compared to their content-based counterparts, among which is language independence and better resilience to adversarial attacks. In this paper we show a novel automatic fake news detection model based on geometric deep learning. The underlying core algorithms are a generalization of classical CNNs to graphs, allowing the fusion of heterogeneous data such as content, user profile and activity, social graph, and news propagation. Our model was trained and tested on news stories, verified by professional fact-checking organizations, that were spread on Twitter. Our experiments indicate that social network structure and propagation are important features allowing highly accurate (92.7% ROC AUC) fake news detection. Second, we observe that fake news can be reliably detected at an early stage, after just a few hours of propagation. Third, we test the aging of our model on training and testing data separated in time. Our results point to the promise of propagation-based approaches for fake news detection as an alternative or complementary strategy to content-based approaches.

MinCutPool is a trainable pooling operator for graphs that learns to map nodes into clusters. The method is trained to approximate the minimum K-cut of the graph to ensure that the clusters are balanced, while also jointly optimizing the objective of the task at hand.

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TL;DR: CT-Layer is a GNN Layer which is able to rewire a graph in an inductive an parameter-free way according to the commute times distance (or effective resistance). We address it learning a differentiable way to compute the CT-embedding of the graph. ### Summary CT-Layer is able to Learn the Commute Times distance between nodes (i.e. effective resistance distance) in a differentiable way, instead of the common spectral version, and in a parameter free manner, which is not the cased of the heat kernel. This approach allow to solve it as an optimization problem inside a GNN, leading to have a new layer which is able to learn how rewire a given graph in an optimal, and inductive way. In addition, CT-Layer also is able to learn Commute Times embeddings, and then calculate it for any graph in an inductive way. The Commute Times embedding is also related with the eigenvalues and eigenvectors of the Laplacian of the graph, because CT embedding is just the eigenvectors scaled. Therefore, CT-Layer is also able to learn hot to calculate the spectrum of the Laplacian in a differentiable way. Therefore, this embedding must satisfy orthogonality and normality. Finally, recent connections has been found between commute times distance and curvature (which is non-differentiable), establishing equivalences between them. Therefore, CT-Layer can also be seen as the differentiable version of the curvature rewiring. **We are going through a quick overview of the layer, but I suggest go to the paper for a detailed explanation. ** ### Spectral CT- Embedding downsides CT-embedding $\mathbf{Z}$ is computed spectrally in the literature (until the proposal of this method) or it is approximated using the heat kernel (very dependent on hyperparameter $t$). This fact does not allow us to propose differentiable methods using that measure: $$ \mathbf{Z}=\sqrt{vol(G)}\mathbf{\Lambda}^\frac{1}{2}\mathbf{F}^T \textrm{ given } \mathbf{L}=\mathbf{F}\mathbf{\Lambda}\mathbf{F}^T $$ Then, CT-distance is given by the Euclidean distances between the embeddings $CT_{uv} = ||\mathbf{z_u}-\mathbf{z_v}||^2$. The spectral form is: $$ \frac{CT_{uv}}{vol(G)} = \sum_{i=2}^n \frac{1}{\lambda_i} (\mathbf{f}(u)-\mathbf{f}(v))^2 $$ being $\mathbf{f}$ the eigenvectors of the graph Laplacian. This embedding and distances gives us desirable properties of the graph, such an understanding of the structure, or an embedding based on the spectrum which minimizes Dirichlet energies. However, the spectral computation is not differentiable. ### CT-Layer as an optimization problem: Differentiable, learnable and inductive CT-Layer Giving that $\mathbf{Z}$ minimizes Dirichlet energies s.t. being orthogonal and normalized, we can formulate this problem as constraining neighboring nodes to have a similar embeddings s.t. $\mathbf{Z}\mathbf{Z}^T=\mathbf{I}$. $$ \mathbf{Z} = \arg\min_{\mathbf{Z}^T\mathbf{Z}=\mathbf{I}} \frac{\sum\_{u,v} ||\mathbf{z_u}-\mathbf{z_v}||^2\mathbf{A}\_{uv}}{\sum\_{u,v} \mathbf{Z}^2\_{uv} d_u}=\frac{Tr[\mathbf{Z}^T\mathbf{L}\mathbf{Z}]}{Tr[\mathbf{Z}^T\mathbf{D}\mathbf{Z}]} $$ With the above elements we have a definition of CT-Layer, our rewiring layer: Given the matrix $\mathbf{X}\_{n\times F}$ encoding the features of the nodes after any message passing (MP) layer, $\mathbf{Z}\_{n\times O(n)}=\tanh(\textrm{MLP}(\mathbf{X}))$ learns the association $\mathbf{X}\rightarrow \mathbf{Z}$ while $\mathbf{Z}$ is optimized according to the loss $$ L\_{CT} = \frac{Tr[\mathbf{Z}^T\mathbf{L}\mathbf{Z}]}{Tr[\mathbf{Z}^T\mathbf{D}\mathbf{Z}]} + \left\|\frac{\mathbf{Z}^T\mathbf{Z}}{\|\mathbf{Z}^T\mathbf{Z}\|\_F} - \mathbf{I}\_n\right\|\_F $$ This results in the following resistance diffusion $\mathbf{T}^{CT} = \mathbf{R}(\mathbf{S})\odot \mathbf{A}$ (Hadamard product between the resistance distance and the adjacency) which provides as input to the subsequent MP layer a learnt convolution matrix. As explained before, $\mathbf{Z}$ is the commute times embedding matrix and the pairwise euclidian distance of that learned embeddings are the commute times distances or resistance distances. Therefore, once trained this layer, it will be able to calculate the commute times embedding for a new graph, and rewire that new and unseen graph in a principled way based on the commute times distance. ## Preservation of Structure Does this rewiring preserve the original structure? Let $G' = \textrm{Sparsify}(G, q)$ be a sampling algorithm of graph $G = (V, E)$, where edges $e \in E$ are sampled with probability $q\propto R_e$ (proportional to the effective resistance, i.e. commute times). Then, for $n = |V|$ sufficiently large and $1/\sqrt{n}< \epsilon\le 1$, we need O(n\log n/\epsilon^2)$ samples to satisfy: $$ \forall \mathbf{x}\in\mathbb{R}^n:\; (1-\epsilon)\mathbf{x}^T\mathbf{L}\_G\mathbf{x}\le\mathbf{x}^T\mathbf{L}\_{G'}\mathbf{x}\le (1+\epsilon)\mathbf{x}^T\mathbf{L}\_G\mathbf{x} $$ The intuitions behind is that Dirichlet energies in $G'$ are bounded in $(1\pm \epsilon)$ of the Dirichlet energies of the original graph $G$.

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