DiTFastAttn: Attention Compression for Diffusion Transformer Models

Zhihang Yuan, Pu Lu, Hanling Zhang, Xuefei Ning, linfeng zhang, Tianchen Zhao, Shengen Yan, Guohao Dai, Yu Wang

DiTFastAttn: Attention Compression for Diffusion Transformer Models: 25 upvotes on Hugging Face Daily Papers, #8 of 30 papers on 2024-06-14. Day-by-day upvote history.

Diffusion Transformers (DiT) excel at image and video generation but face computational challenges due to self-attention's quadratic complexity. We propose DiTFastAttn, a novel post-training compression method to alleviate DiT's computational bottleneck. We identify three key redundancies in the attention computation during DiT inference: 1. spatial redundancy, where many attention heads focus on local information; 2. temporal redundancy, with high similarity between neighboring steps' attention outputs; 3. conditional redundancy, where conditional and unconditional inferences exhibit significant similarity. To tackle these redundancies, we propose three techniques: 1. Window Attention with Residual Caching to reduce spatial redundancy; 2. Temporal Similarity Reduction to exploit the similarity between steps; 3. Conditional Redundancy Elimination to skip redundant computations during conditional generation. To demonstrate the effectiveness of DiTFastAttn, we apply it to DiT, PixArt-Sigma for image generation tasks, and OpenSora for video generation tasks. Evaluation results show that for image generation, our method reduces up to 88\% of the FLOPs and achieves up to 1.6x speedup at high resolution generation.

Paper page on Hugging Face · arXiv

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