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Unsupervised skeleton-based action representation learning via relation consistency pursuit

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Abstract

In this paper, we propose a Skeleton-based Relation Consistency Learning scheme (SRCL) for unsupervised 3D action representation learning. By leveraging the inter-instance similarity score distribution as relation metric, SRCL is able to pursue not only the similarity but also the inter-instance relation consistency of different augmentations from same skeleton instance. The architecture of SRCL consists of two asymmetric neural networks, referred to as online and target networks. The online network is trained to mimic the inter-instance similarity score distribution inferred by the target network over a set of skeleton instances. Moreover, with the relation consistency achieved by distribution similarity learning, diversified skeleton positives can be potentially provided, which further boosts the representation learning. Experimental results verify that the proposed framework outperforms state-of-the-art methods on the challenging NTU-60 and NTU-120 datasets under unsupervised settings. Code will be available.

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Zhang, W., Hou, Y. & Zhang, H. Unsupervised skeleton-based action representation learning via relation consistency pursuit. Neural Comput & Applic 34, 20327–20339 (2022). https://doi.org/10.1007/s00521-022-07584-9

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