Instruct: Classify a review as either positive or negative.
Query: Not a handbook, not a good book

I don't understand the gap between the two group of reviews ( 5 stars and 1 star). As other reviewer said, this book is just a list of techniques without proper examples and without proper math. I understood a couple because I already knew about them. If I would try to use any of the techniques I couldn't. There is more to an algorithm than half a page of description. Where are the examples, the ups and downs, the math justification ?