Reviews of professor Yang Yu

Rating: 2.0/5, difficulty: 4.0/5
Not sure how it was before online, but it was very difficult to follow his lectures. He is knowledgable but communicates his ideas poorly. He makes things more confusing than they should be, and sometimes is not able to do his own questions. It was mostly self-study. 2 Midterms and one optional final. 5 HW total every two weeks.

Rating: 1.0/5, difficulty: 4.0/5
Cannot explain at all, very monotone, do not take tests are open book but hard

Rating: 5.0/5, difficulty: 4.0/5
Professor Yu's lectures are very clear. Assignments and practice sets are very useful for exams. Read the textbook and everything is not hard.