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arXiv 1502.04071cs.ITmath.ITmath.STstat.TH
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具有非线性观测的广义Lasso

The generalized Lasso with non-linear observations

Yaniv Plan, Roman Vershynin

摘要:

研究了当信号属于埋在高维空间中的低维集合时,从非线性观测值中估计信号的问题。在实践中经常使用的一种粗略的启发式假设,非线性观测可以被视为噪声线性观测,因此可以使用广义Lasso估计信号。这很吸引人,因为这个程序有大量高效的、专门的求解器。正如噪声可以通过投影到较低维空间上来减少一样,当在重建中使用信号结构时,来自用线性观测对非线性观测进行建模的误差将大大减少。我们允许一般的信号结构,只假设信号属于R^n中的某个集合K。我们考虑非线性的单指数模型。我们的理论允许非线性是不连续的,不是一对一的,甚至是未知的。我们假设测量矩阵为随机高斯模型,但允许行具有未知的协方差矩阵。作为我们的结果的特殊情况下,我们恢复近最优理论的噪声线性观测,也给出了第一个理论精度保证1位压缩感知与未知的协方差矩阵的测量向量。

英文摘要:

We study the problem of signal estimation from non-linear observations when the signal belongs to a low-dimensional set buried in a high-dimensional space. A rough heuristic often used in practice postulates that non-linear observations may be treated as noisy linear observations, and thus the signal may be estimated using the generalized Lasso. This is appealing because of the abundance of efficient, specialized solvers for this program. Just as noise may be diminished by projecting onto the lower dimensional space, the error from modeling non-linear observations with linear observations will be greatly reduced when using the signal structure in the reconstruction. We allow general signal structure, only assuming that the signal belongs to some set K in R^n. We consider the single-index model of non-linearity. Our theory allows the non-linearity to be discontinuous, not one-to-one and even unknown. We assume a random Gaussian model for the measurement matrix, but allow the rows to have an unknown covariance matrix. As special cases of our results, we recover near-optimal theory for noisy linear observations, and also give the first theoretical accuracy guarantee for 1-bit compressed sensing with unknown covariance matrix of the measurement vectors.

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