论文标题

信号恢复,具有非扩展性生成网络先验

Signal Recovery with Non-Expansive Generative Network Priors

论文作者

Cocola, Jorio

论文摘要

我们先前使用深层生成网络研究压缩感。从压缩线性测量中有效恢复的初始理论保证已为具有高斯权重和对数扩展性的Relu网络范围内开发了信号:那时,每一层比对数因子大于前一层。后来表明,恒定的扩张性足以恢复。是否可以放松膨胀性,允许具有收缩层的网络(实际发生器的情况)保持开放。在这项工作中,我们回答了这个问题,证明可以从几个线性测量值中恢复高斯生成网络范围内的信号,前提是层的宽度与输入层大小成正比(最多到日志因子)。这种情况使生成网络具有承包层。我们的结果是基于表明高斯矩阵满足矩阵浓度不平等的,我们将其定期范围限制重量分布条件(R2WDC),并且削弱了以前理论保证的重量分布条件(WDC)。 WDC还用于分析生成网络先验的其他信号恢复问题。通过用R2WDC替换WDC,我们能够扩展信号恢复的先前结果,并将其扩展的生成网络先验的先验扩展到非增强速度。我们讨论了这些相位检索,脱氧和尖峰矩阵恢复的扩展。

We study compressive sensing with a deep generative network prior. Initial theoretical guarantees for efficient recovery from compressed linear measurements have been developed for signals in the range of a ReLU network with Gaussian weights and logarithmic expansivity: that is when each layer is larger than the previous one by a logarithmic factor. It was later shown that constant expansivity is sufficient for recovery. It has remained open whether the expansivity can be relaxed, allowing for networks with contractive layers (as often the case of real generators). In this work we answer this question, proving that a signal in the range of a Gaussian generative network can be recovered from few linear measurements provided that the width of the layers is proportional to the input layer size (up to log factors). This condition allows the generative network to have contractive layers. Our result is based on showing that Gaussian matrices satisfy a matrix concentration inequality which we term Range Restricted Weight Distribution Condition (R2WDC) and that weakens the Weight Distribution Condition (WDC) upon which previous theoretical guarantees were based. The WDC has also been used to analyze other signal recovery problems with generative network priors. By replacing the WDC with the R2WDC, we are able to extend previous results for signal recovery with expansive generative network priors to non-expansive ones. We discuss these extensions for phase retrieval, denoising, and spiked matrix recovery.

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