.NET 5开始支援半精度浮点数Half类型
https://www.ithome.com.tw/news/139755
直接查维基感觉是最近才出来的新型别，
Reference来源日期好像都是2018以后
bfloat16 floating-point format
https://en.wikipedia.org/wiki/Bfloat16_floating-point_format
Wang, Shibo; Kanwar, Pankaj (2019-08-23). "BFloat16: The secret to high
performance on Cloud TPUs". Google Cloud. Retrieved 2020-08-11. This custom
floating point format is called “Brain Floating Point Format,” or “bfloat16
” for short. The name flows from “Google Brain”, which is an artificial
intelligence research group at Google where the idea for this format was
conceived.