In our country, first-class universities, such as Fudan University, arrange a two-person dormitory similar to a rocket class for undergraduates. Some majors in Tsinghua are also dormitories for two people, and Peking University has four people as usual. This is from a public university.
Some private universities may also set up such dormitories in the future. The remaining undergraduates are generally four or six. There are only two doctoral students when they arrive.