sentence1: sentiment classification is the task of identifying the sentiment polarity ( e.g. , positive or negative ) of * 1 corresponding author a natural language text towards a given topic ( cite-p-18-1-19 , cite-p-18-3-1 ) and has become the core component of many important applications in opinion analysis ( cite-p-18-1-2 , cite-p-18-1-10 , cite-p-18-1-15 , cite-p-18-3-4 ) .
sentence2: sentiment classification is the fundamental task of sentiment analysis ( cite-p-15-3-11 ) , where we are to classify the sentiment of a given text .