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. part of the effort to better exploiting this information for supporting users, researches have been actively investigating the problem of automatic sentiment classification. Sentiment classification. . . . . . 4 1.4.1 Sentiment classification . . . . . . . . . . . . . . . . . . . . . . 4 1.4.1.1 Sentiment classification tasks . . . . . . . . . . . . . 4 1.4.1.2 Sentiment classification features. rely heavily on annotated corpus for training the sentiment classifier. The sentiment corpora are considered as the most valuable resources for the sentiment classification task. However, such