[Announcement] HW3 and plans

1. Homework 3 is out. Checkout  https://classroom.github.com/a/iZoddaZG 
Due: 10/21 23:59:59

2. There will be no lectures in the next week.

3. No class on Oct 27 (due to my business trip). Instead, I plan to have an alternative lecture at 10:30 am Oct 26. If you are available, join the zoom meeting. Otherwise, you can watch the lecture video. Sorry about this.