Task-Agnostic Graph Neural Network Evaluation via Adversarial Collaboration

It has been increasingly demanding to develop reliable Graph Neural Network (GNN) evaluation methods to quantify the progress of the rapidly expanding GNN research. Existing GNN benchmarking methods focus on comparing the GNNs with respect to their performances on some node/graph classification/regression tasks in certain datasets. There lacks a principled, task-agnostic method to directly compare two GNNs. Moreover, most of the existing graph self-supervised learning (SSL) works incorporate handcrafted augmentations to the graph, which has several severe difficulties due to the unique characteristics of graph-structured data. To address the aforementioned issues, we propose GraphAC (Graph Adversarial Collaboration) -- a conceptually novel, principled, task-agnostic, and stable framework for evaluating GNNs through contrastive self-supervision. GraphAC succeeds in distinguishing GNNs of different expressiveness across various aspects, and has been proven to be a principled and reliable GNN evaluation method, eliminating the need for handcrafted augmentations for stable SSL.