In this task, you are given books product reviews in English language. The goal is to classify the review as "POS" if the overall sentiment of the review is positive or as "NEG" if the overall sentiment of the review is negative.

[EX Q]: Excellent introduction to the field for physicists . Perhaps the best feature of this book is that it aims to convey the theory of Lie algebras and Lie groups to physicists. In doing so, the author is careful to give a very simplistic approach so that one not familiar with  the subject can understand it. Not to say that the book is elementary,  since it builds rapidly into the far more interesting aspects of Lie  Groups. A very good read
[EX A]: POS

[EX Q]: Nothing That's Not In Other Books . There's nothing in this book that isn't in many other photography books.  Much of the book is taken up with definitions and discussion of equipment and techniques, rather than approaches to creativity (as is implied by the sub-title of the book).  The photos are far from inspiring.  I didn't learn anything from this book
[EX A]: NEG

[EX Q]: A typical Star Trek book. . This can't really belong to TOS, as it's not actually that closely related to the original series. Following Spock as he tries to reconcile his human and Vulcan sides as he is posted for the first time to the Enterprise, the book also introduces us to a young Scotty in an entertaining side story. We  also meet Captain Pike (who might as well be Kirk from the way he behaves),  and the previous doctor, engineer and first officer. The plot goes that an  ancient (and missing) Vulcan gem, the largest in existence, has been found  on a primitive planet which the Enterprise happens to be visiting. After  retrieving it, however, mysterious murders start to happen on the  Enterprise, while Pike, on the planet's surface, becomes embroiled in a  missing person hunt for two young lovers who could have been kidnapped by  mutants. And then love blossoms between Spock and another Vulcan on the  ship... the ending rounds everything off nicely. This book isn't really  anything special, but it's quite entertaining for a Trek book
[EX A]:
POS