Lsislif: CRF and Logistic Regression for Opinion Target Extraction and Sentiment Polarity Analysis

Hussam Hamdan, Patrice Bellot, Frederic Bechet
2015 Proceedings of the 9th International Workshop on Semantic Evaluation (SemEval 2015)  
This paper describes our contribution in Opinion Target Extraction OTE and Sentiment Polarity sub tasks of SemEval 2015 ABSA task. A CRF model with IOB notation has been adopted for OTE with several groups of features including syntactic, lexical, semantic, sentiment lexicon features. Our submission for OTE is ranked fifth over twenty submissions. A Logistic Regression model with a weighting schema of positive and negative labels have been used for sentiment polarity; several groups of features
more » ... (lexical, syntactic, semantic, lexicon and Z score) are extracted. Our submission for Sentiment Polarity is ranked third over ten submissions on the restaurant data set, third over thirteen on the laptops data set, but the first over eleven on the hotel data set that is out-of-domain set.
doi:10.18653/v1/s15-2128 dblp:conf/semeval/HamdanBB15a fatcat:r2cqkp2zinezxichqr3pho5lbu