Instruct: Classify Amazon reviews into positive or negative sentiment
Query: a waste of money

what a waste of money!.. I should not have bought this book. There is only about 10% of the solution of the exercise from each chapter, it won't help you learn anything. There are still 90% of the hard exercises that you cannot do because it's just too hard and no hint from this manual at all.I suggest you NOT to buy this book, but seek help from your instructor or tutoring center.