Sentiment analysis implies attitudes, which imply context. A robust sentiment analysis system must either be trained on a targeted corpus (in which entities/con

Sentiment analysis implies attitudes, which imply context. A robust sentiment analysis system must either be trained on a targeted corpus (in which entities/concepts and attitudes are well aligned) or include some way of establishing a more targeted context after having been trained on a general-purpose corpus. That is to say, people generally aren't describing the physical material occupying a toilet in a corpus of movie reviews.