DuoCLR: Dual-Surrogate Contrastive Learning for Skeleton-based Human Action Segmentation

• URL: http://arxiv.org/abs/2509.05543v1
• Date: Fri, 05 Sep 2025 23:46:51 GMT
• Title: DuoCLR: Dual-Surrogate Contrastive Learning for Skeleton-based Human Action Segmentation
• Abstract summary: A contrastive representation learning framework is proposed to enhance human action segmentation via pre-training.<n>The proposed framework focuses on exploiting multi-scale representations in conjunction with cross-sequence variations.<n>In experiments, DuoCLR is pre-trained on a trimmed skeleton dataset and evaluated on an untrimmed dataset.
• Score: 6.660458629649825
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In this paper, a contrastive representation learning framework is proposed to enhance human action segmentation via pre-training using trimmed (single action) skeleton sequences. Unlike previous representation learning works that are tailored for action recognition and that build upon isolated sequence-wise representations, the proposed framework focuses on exploiting multi-scale representations in conjunction with cross-sequence variations. More specifically, it proposes a novel data augmentation strategy, 'Shuffle and Warp', which exploits diverse multi-action permutations. The latter effectively assists two surrogate tasks that are introduced in contrastive learning: Cross Permutation Contrasting (CPC) and Relative Order Reasoning (ROR). In optimization, CPC learns intra-class similarities by contrasting representations of the same action class across different permutations, while ROR reasons about inter-class contexts by predicting relative mapping between two permutations. Together, these tasks enable a Dual-Surrogate Contrastive Learning (DuoCLR) network to learn multi-scale feature representations optimized for action segmentation. In experiments, DuoCLR is pre-trained on a trimmed skeleton dataset and evaluated on an untrimmed dataset where it demonstrates a significant boost over state-the-art comparatives in both multi-class and multi-label action segmentation tasks. Lastly, ablation studies are conducted to evaluate the effectiveness of each component of the proposed approach.

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