あとで読む（Langevin distribution）

https://projecteuclid.org/download/pdfview_1/euclid.ba/1570586976

https://arxiv.org/pdf/1311.0907.pdf

https://s3.amazonaws.com/academia.edu.documents/47812415/Bayesian_inference_on_the_Stiefel_manifo20160805-18697-1qlmsoj.pdf?response-content-disposition=inline%3B%20filename%3DBayesian_inference_on_the_Stiefel_manifo.pdf&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWOWYYGZ2Y53UL3A%2F20200305%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200305T152136Z&X-Amz-Expires=3600&X-Amz-SignedHeaders=host&X-Amz-Signature=f1d85956a6529bd876dfdb566195ffe74c0bbe5e5b57d5399652c2e44ce05d57

https://www.sciencedirect.com/science/article/abs/pii/S1568494615006626

https://facerec.ece.wisc.edu/cameranet/turaga08.pdf

https://escholarship.org/content/qt1c97m0j3/qt1c97m0j3.pdf

https://www.sciencedirect.com/science/article/abs/pii/0378375883900435