Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not bad, could be better

Text generally follows the standard definition-theorem-proof format. The writing style is informal and abbreviated, but the presentation is usually rigorous. That said, this is not a learning text: the utter lack of worked examples is frustrating, as are the poorly labeled graphs scattered throughout (in fact, some of the graphs aren't labeled at all). I don't mind working when I read a mathematics text. But I also don't like having to guess what things mean, or how to use results. Too often this text forced me to guess. Inclusion of worked, explanatory examples would have been helpful in this regard. Each chapter comes equipped with a set of exercises. Many of these are quite challenging. Overall, a serious and demanding text.