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arXiv 0810.0901stat.ML
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稀疏广义线性模型的大尺度变分推断与试验设计

Large Scale Variational Inference and Experimental Design for Sparse Generalized Linear Models

Matthias W. Seeger, Hannes Nickisch

摘要:

通过最大化稀疏线性模型(SLM)的后验分布,可以解决低层计算机视觉和图像处理中的许多问题,如去噪、反卷积、层析重建或超分辨率等。我们展示了如何高阶贝叶斯决策问题,如优化磁共振扫描仪中的图像采集,可以通过查询SLM后验协方差来解决,与密度的模式无关。我们提出了一个可扩展的算法框架,SLM后验在全,高分辨率的图像可以近似为第一次,解决变分优化问题,这是凸当后验模式发现是凸的。这些方法通过贝叶斯试验设计成功地驱动了用于真实世界磁共振成像的采样轨迹的优化,这在以前没有尝试过。我们的方法提供了新的见解稀疏重建和近似贝叶斯推断之间的相似性和差异,并具有重要意义的压缩感知现实世界的图像。

英文摘要:

Many problems of low-level computer vision and image processing, such as denoising, deconvolution, tomographic reconstruction or super-resolution, can be addressed by maximizing the posterior distribution of a sparse linear model (SLM). We show how higher-order Bayesian decision-making problems, such as optimizing image acquisition in magnetic resonance scanners, can be addressed by querying the SLM posterior covariance, unrelated to the density's mode. We propose a scalable algorithmic framework, with which SLM posteriors over full, high-resolution images can be approximated for the first time, solving a variational optimization problem which is convex iff posterior mode finding is convex. These methods successfully drive the optimization of sampling trajectories for real-world magnetic resonance imaging through Bayesian experimental design, which has not been attempted before. Our methodology provides new insight into similarities and differences between sparse reconstruction and approximate Bayesian inference, and has important implications for compressive sensing of real-world images.

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