Instruct: Classify Amazon reviews into positive or negative sentiment
Query: very hard to read

I bought this book, and after reading a couple chapters, I realised I wasted my money on this. Like others have pointed out, the author were too literate on a technical subject. The story kept wandering around, making it hard to follow by me. I have to re-read the text couple times just to make sure I know what he is talking about. I'm very disappointed.