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PeRFlow: Piecewise Rectified Flow as Universal Plug-and-Play Accelerator

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arxiv 2405.07510 v5 pith:UEGUKYFN submitted 2024-05-13 cs.LG

PeRFlow: Piecewise Rectified Flow as Universal Plug-and-Play Accelerator

Hanshu Yan , Xingchao Liu , Jiachun Pan , Jun Hao Liew , Qiang Liu , Jiashi Feng This is my paper
classification cs.LG
keywords modelsperflowdiffusionpiecewiseflowflowsplug-and-playrectified
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present Piecewise Rectified Flow (PeRFlow), a flow-based method for accelerating diffusion models. PeRFlow divides the sampling process of generative flows into several time windows and straightens the trajectories in each interval via the reflow operation, thereby approaching piecewise linear flows. PeRFlow achieves superior performance in a few-step generation. Moreover, through dedicated parameterizations, the PeRFlow models inherit knowledge from the pretrained diffusion models. Thus, the training converges fast and the obtained models show advantageous transfer ability, serving as universal plug-and-play accelerators that are compatible with various workflows based on the pre-trained diffusion models. Codes for training and inference are publicly released. https://github.com/magic-research/piecewise-rectified-flow

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