Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great on math, weak on journalism.

Luckily I only wanted the math of the subject, so for me this is an ideal book. If you bought it hoping to come away with a better understanding of the subject you'd better have started with at least a degree in Applied Mathematics, and possibly your Master's too. The book is written as a college course book, not as a coffee table reader.