August 12, 2026 ScalingAttention: Discovering Intrinsic Sparse Attention Topology for Video Diffusion Transformers ScalingAttention：通过权重编码的内在稀疏注意力拓扑发现机制（WEST）与保真度感知的稀疏度自适应调节（FAST）以及位级块稀疏注意力内核（crm kernel），实现视频扩散Transformer的高效训练无关推理加速 video diffusion transformers sparse attention intrinsic sparse topology WEST FAST Hellinger distance CRM kernel FlashAttention-3 Wan2.1 HunyuanVideo training-free block-sparse attention