Instruct: Classify Amazon reviews into positive or negative sentiment
Query: More of a reference book

I was a bit disappointed by this book. It is written more like a reference book than something you can read through to learn the material. It is full of various equations with little in the way of "plain english" explanations. If you are VERY comfortable with vector math and looking at lots of equations, then this book may be a good reference. If you are looking for understanding basic concepts, then you will need to look elsewhere.