The posterior distribution in a nonparametric inverse problem is shown to
contract to the true parameter at a rate that depends on the smoothness of the
parameter, and the smoothness and scale of the prior. Correct combinations of
these characteristics lead to the minimax rate. The frequentist coverage of
credible sets is shown to depend on the combination of prior and true
parameter, with smoother priors leading to zero coverage and rougher priors to
conservative coverage. In the latter case credible sets are of the correct
order of magnitude. The results are numerically illustrated by the problem of
recovering a function from observation of a noisy version of its primitive.

本文研究了非参数逆问题中的后验分布，证明其收敛于真实参数的速率取决于参数的平滑度以及先验的平滑度和尺度。正确组合这些特征可以实现最小化速率。显示可信度集的频率覆盖取决于先验和真实参数的组合，先验更平滑会导致零覆盖，而粗糙的先验会导致保守的覆盖。在后一种情况下，可信区间的数量级是正确的。通过恢复受噪音干扰的基本函数的问题进行了数值演示。