Teacher: Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
Teacher: Now, understand the problem? If you are still confused, see the following example:
I've read this book with much expectation, it was very boring all through out the book
Solution: Negative
Reason: Review writer does not like the book because it was boring, therefore it is a negative review.

Now, solve this instance: I'll be honest, this is a depressing book. But it is about a depressing subject. This is a semi-autobiographical look at the author's internment in one of the Japanese's POW camps, Changi. It is a statement on the ingenuity and cunning of mankind, but also of its brutality. If you're looking for a quick, solid read, this is it.
Student:
Positive