Plug-and-Play Algorithm Convergence Analysis From The Standpoint of Stochastic Differential Equation
<|reference_start|>Plug-and-Play Algorithm Convergence Analysis From The Standpoint of Stochastic Differential Equation: The Plug-and-Play (PnP) algorithm is popular for inverse image problem-solving. However, this algorithm lacks theoretical analysis of its convergence with more advanced plug-in denoisers. We demonstrate that discrete PnP iteration can be described by a continuous stochastic differential equation (SDE). We can also achieve this transformation through Markov process formulation of PnP. Then, we can take a higher standpoint of PnP algorithms from stochastic differential equations, and give a unified framework for the convergence property of PnP according to the solvability condition of its corresponding SDE. We reveal that a much weaker condition, bounded denoiser with Lipschitz continuous measurement function would be enough for its convergence guarantee, instead of previous Lipschitz continuous denoiser condition.<|reference_end|>
@article{wang2024plug-and-play,
    title={Plug-and-Play Algorithm Convergence Analysis From The Standpoint of
  Stochastic Differential Equation},
    author={Zhongqi Wang, Bingnan Wang, Maosheng Xiang},
    journal={arXiv preprint arXiv:2404.13866},
    year={2024},
    archivePrefix={arXiv},
    eprint={2404.13866},
    primaryClass={cs.CV math.PR}
}