We introduce a new family of particle evolution samplers suitable for constrained domains and non-Euclidean geometries. Stein Variational Mirror Descent and Mirrored Stein Variational Gradient Descent minimize the Kullback-Leibler (KL) divergence to constrained target distributions by evolving particles in a dual space defined by a mirror map. Stein Variational Natural Gradient exploits non-Euclidean geometry to more efficiently minimize the KL divergence to unconstrained targets. We derive these samplers from a new class of mirrored Stein operators and adaptive kernels developed in this work. We demonstrate that these new samplers yield accurate approximations to distributions on the simplex, deliver valid confidence intervals in post-selection inference, and converge more rapidly than prior methods in large-scale unconstrained posterior inference. Finally, we establish the convergence of our new procedures under verifiable conditions on the target distribution.

本研究介绍了一种新的粒子演化采样器，适用于约束域和非欧几里德几何。使用 Stein Variational Mirror Descent 和 Mirrored Stein Variational Gradient Descent 定义一个镜像映射，在双重空间中演化粒子，通过最小化 KL 散度到约束目标分布。 Stein Variational Natural Gradient 利用非欧几里德几何更高效地最小化 KL 散度到无约束目标。通过引入首次开发的一类镜像 Stein 算子和自适应内核来推导这些采样器。证明了这些新的采样器在单纯形上可以精确地逼近分布，在后选择推断中提供有效的置信区间，并且在大规模无约束后验推断中比以前的方法更快地收敛。最后，在目标分布上的可验证条件下，我们建立了我们的新程序的收敛性。

镜像Stein算子采样