ST-GDance++: A Scalable Spatial-Temporal Diffusion for Long-Duration Group Choreography

TL;DR

ST-GDance++ is a scalable framework for long-duration group dance generation that efficiently models spatial-temporal interactions, reducing computational complexity and improving stability in multi-dancer choreography.

Contribution

It introduces a decoupled spatial-temporal diffusion approach with lightweight graph convolutions and an efficient attention mask for scalable, collision-aware group dance synthesis.

Findings

Achieves competitive quality with lower latency

Effectively models dense spatial-temporal interactions

Enables long-duration, stable choreography generation

Abstract

Group dance generation from music requires synchronizing multiple dancers while maintaining spatial coordination, making it highly relevant to applications such as film production, gaming, and animation. Recent group dance generation models have achieved promising generation quality, but they remain difficult to deploy in interactive scenarios due to bidirectional attention dependencies. As the number of dancers and the sequence length increase, the attention computation required for aligning music conditions with motion sequences grows quadratically, leading to reduced efficiency and increased risk of motion collisions. Effectively modeling dense spatial-temporal interactions is therefore essential, yet existing methods often struggle to capture such complexity, resulting in limited scalability and unstable multi-dancer coordination. To address these challenges, we propose ST-GDance++, a scalable framework that decouples spatial and temporal dependencies to enable efficient and collision-aware group choreography generation. For spatial modeling, we introduce lightweight distance-aware graph convolutions to capture inter-dancer relationships while reducing computational overhead. For temporal modeling, we design a diffusion noise scheduling strategy together with an efficient temporal-aligned attention mask, enabling stream-based generation for long motion sequences and improving scalability in long-duration scenarios. Experiments on the AIOZ-GDance dataset show that ST-GDance++ achieves competitive generation quality with significantly reduced latency compared to existing methods.