We do not have a formal textbook for this class, but I am still providing optional readings. The content of this course is heavily influenced by these books, both both freely available:
ESL - The Elements of Statistical Learning
ISL - An Introduction to Statistical Learning
At a minimum, skim through the text and look at the visualizations. Here's two examples of the great stuff you're missing out on if you don't.
The readings are as follows:
Notation guide:
There are numerous differences in notation, but here are the major ones: