Sanremo's Winner Is... Category-driven Selection Strategies for Active Learning

This paper compares Active Learning selection strategies for sentiment analysis of Twitter data. We focus mainly on category-driven strategies, which select training instances taking into consideration the confidence of the system as well as the category of the tweet (e.g. positive or negative). We show that this com- bination is particularly effective when the performance of the system is unbalanced over the different categories. This work was conducted in the framework of automatically ranking the songs of “Festival di Sanremo 2017” based on sentiment analysis of the tweets posted during the contest.