Probing Negative Sampling Strategies to Learn GraphRepresentations via Unsupervised Contrastive Learning

Shiyi Chen, Ziao Wang, Xinni Zhang, Xiaofeng Zhang, Dan Peng

Abstract: Graph representation learning has long been an important yet challenging task for various real-world applications. However, their downstream tasks are mainly performed in the settings of supervised or semi-supervised learning. Inspired by recent advances in unsupervised contrastive learning, this paper is thus motivated to investigate how the node-wise contrastive learning could be performed. Particularly, we respectively resolve the class collision issue and the imbalanced negative data distribution issue. Extensive experiments are performed on three real-world datasets and the proposed approach achieves the SOTA model performance.