Hierarchical Compositional Representations for Few-shot Action Recognition

• URL: http://arxiv.org/abs/2208.09424v3
• Date: Fri, 19 Jan 2024 05:32:54 GMT
• Title: Hierarchical Compositional Representations for Few-shot Action Recognition
• Authors: Changzhen Li, Jie Zhang, Shuzhe Wu, Xin Jin, and Shiguang Shan
• Abstract summary: We propose a novel hierarchical compositional representations (HCR) learning approach for few-shot action recognition. We divide a complicated action into several sub-actions by carefully designed hierarchical clustering. We also adopt the Earth Mover's Distance in the transportation problem to measure the similarity between video samples in terms of sub-action representations.
• Score: 51.288829293306335
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Recently action recognition has received more and more attention for its comprehensive and practical applications in intelligent surveillance and human-computer interaction. However, few-shot action recognition has not been well explored and remains challenging because of data scarcity. In this paper, we propose a novel hierarchical compositional representations (HCR) learning approach for few-shot action recognition. Specifically, we divide a complicated action into several sub-actions by carefully designed hierarchical clustering and further decompose the sub-actions into more fine-grained spatially attentional sub-actions (SAS-actions). Although there exist large differences between base classes and novel classes, they can share similar patterns in sub-actions or SAS-actions. Furthermore, we adopt the Earth Mover's Distance in the transportation problem to measure the similarity between video samples in terms of sub-action representations. It computes the optimal matching flows between sub-actions as distance metric, which is favorable for comparing fine-grained patterns. Extensive experiments show our method achieves the state-of-the-art results on HMDB51, UCF101 and Kinetics datasets.

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