S上课人多，几百到上千。比如NLP, S五百多人课堂，M可能一半多，三四百人，P更一半，大概一百人，是S的五分之一

https://stanforddaily.com/2019/02/19/cs-in-crisis-is-stanford-doing-enough-to-respond-to-capacity-and-inclusion-challenges

https://stanforddaily.com/2021/02/04/the-rise-of-ai-in-stanfords-cs-curricula/

P的advanced NLP讨论班只有三十几个学生，猜里面大概不到十个本科生.