Dong, Jianfeng, Shengkai Sun, Zhonglin Liu, Shujie Chen, Baolong Liu, and Xun Wang. 2023. “Hierarchical Contrast for Unsupervised Skeleton-Based Action Representation Learning”. Proceedings of the AAAI Conference on Artificial Intelligence 37 (1):525-33. https://doi.org/10.1609/aaai.v37i1.25127.