ReMoMask-2: Latent Retrieval-Augmented Masked Motion Generation

Yiran Wang; Zeyu Zhang; Ling Shao; Hao Tang

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arXiv · 2609.08365

ReMoMask-2: Latent Retrieval-Augmented Masked Motion Generation

Yiran Wang·Zeyu Zhang·Ling Shao·Hao Tang

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Abstract

Text-to-motion (T2M) generation maps natural language to human joint movements, aiding gaming, VR, and robotics. Retrieval-Augmented Text-to-Motion (RAG-T2M) improves generation on complex descriptions by conditioning on retrieved motion-text pairs. However, existing RAG-T2M models face two challenges: coarse-grained retrieval and fusion mechanisms overlook the hierarchical, spatial-temporal topology of human motion, and a representation gap exists because retrieved evidence resides in a semantic space separate from the generator's latents. To address the first, we present ReMoMask, a structure-aware RAG framework coupling Hierarchical Bidirectional Momentum (HBM) contrastive learning to align global and part-level features with text; Semantic Spatial-Temporal Attention (SSTA) for topology-aware fusion; and Topology Structured Masking (TSM) to force robust part-level grounding via adaptive masking. To address the second, we introduce ReMoMask-2, which rebuilds the retrieval database directly within the generator's pre-quantization latent space and aligns text queries via a distilled lightweight projector, allowing the generator to directly consume the retrieved motion's semantic content. Extensive experiments on HumanML3D, KIT-ML, and SnapMoGen demonstrate our retriever achieves state-of-the-art accuracy, while ReMoMask-2 attains the lowest FID on KIT-ML and SnapMoGen; notably, its single mask-transformer stage surpasses ReMoMask's full two-stage pipeline and delivers the fastest inference.

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Yiran Wang, Zeyu Zhang, Ling Shao, Hao Tang. 2026-09-08. ReMoMask-2: Latent Retrieval-Augmented Masked Motion Generation. https://arxiv.org/abs/2609.08365

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