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MASQ: Mask-Aware Spatiotemporal Quantization for Unsupervised Skeleton Action Segmentation

arXiv · AI, language, vision and robotics · article · Aug 30, 2026 · UTC

Unsupervised skeleton-based temporal action segmentation is a crucial task for understanding human behavior in long untrimmed sequences. Recent approaches often rely on discrete quantization to discover action boundaries from motion representations. However, when spatial masking is introduced for representation learning, it can introduce representation ambiguity, while discrete quantization further amplifies small fluctuations in the latent space. The interaction between these two factors often leads to unstable code switching and severe temporal jitter near action boundaries.To address these

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