AUEB ABSA at SemEval 2016 Task 5: Ensembles of Classifiers and Embeddings for Aspect Based Sentiment Analysis
This paper describes our submissions to the Aspect Based Sentiment Analysis task of SemEval 2016. For Aspect Category Detection (Subtask1/Slot1) we used multiple ensembles, based on Support Vector Machine classifiers. For Opinion Target Expression extraction (Subtask1/Slot2) we used a sequence labeling approach with Conditional Random Fields. For Polarity Detection (Subtask1/Slot3) we used an ensemble of two supervised classifiers, one based on hand crafted features and one based on word embeddings. Our systems were ranked in the top 6 positions in all the tasks we participated. The source code of our systems is publicly available.
*SEMEVAL