Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Need Lower Rating Scale for this one.

Not sure what O'Reilly had in mind in publishing this book. You can get pretty much the same information from organizations like CERT for FREE. If meant for management, it still missed the mark since in many cases management is still trying to learn how to spell S-E-C-U-R-I-T-Y. A concept like IR is way over their heads and out of the question. With shrinking budgets people are looking for solutions not another obtuse layer of complexity. Glad to see the price drop - still too much for what you get.