https://medium.com/@rtdcunha/gaussian-bernoulli-restricted-boltzmann-machines-4a68b8765485 https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0171015&type=printable
https://github.com/DSL-Lab/GRBM/tree/main
https://www.ee.nthu.edu.tw/hchen/pubs/iee2003.pdf
