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arXiv 2008.02200cs.LGstat.ML
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Wasserstein投影及其在反问题中的应用

Wasserstein-based Projections with Applications to Inverse Problems

UCLA(加州大学洛杉矶分校)

Howard Heaton, Samy Wu Fung, Alex Tong Lin, Stanley Osher, Wotao Yin

摘要:

逆问题包括从噪声测量的集合中恢复信号。这些通常被视为优化问题,经典方法使用数据保真度项和稳定恢复的分析正则化器。最近的即插即用(Pingdom)的作品提出用数据驱动的去噪器代替优化方法中的解析正则化算子。这些方案获得了最先进的结果,但以有限的理论保证为代价。为了弥合这一差距,我们提出了一个新的算法,从流形的真实数据作为输入的样本,并输出到这个流形上的投影算子的近似。在标准假设下,我们证明了该算法生成一个学习算子,称为基于Wasserstein的投影(WP),以高概率近似真实投影。因此,WPs可以像Pests一样被插入到优化方法中,但是现在有了理论上的保证。所提供的数值示例示出WP获得了用于无监督PSNR信号恢复的最新结果。

英文摘要:

Inverse problems consist of recovering a signal from a collection of noisy measurements. These are typically cast as optimization problems, with classic approaches using a data fidelity term and an analytic regularizer that stabilizes recovery. Recent Plug-and-Play (PnP) works propose replacing the operator for analytic regularization in optimization methods by a data-driven denoiser. These schemes obtain state of the art results, but at the cost of limited theoretical guarantees. To bridge this gap, we present a new algorithm that takes samples from the manifold of true data as input and outputs an approximation of the projection operator onto this manifold. Under standard assumptions, we prove this algorithm generates a learned operator, called Wasserstein-based projection (WP), that approximates the true projection with high probability. Thus, WPs can be inserted into optimization methods in the same manner as PnP, but now with theoretical guarantees. Provided numerical examples show WPs obtain state of the art results for unsupervised PnP signal recovery.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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