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The Internet contains a wealth of information in the form of unstructured texts such as customer comments on products, events and more. By extracting and analyzing the opinions expressed in customer comments in detail, it is possible to obtain valuable opportunities and information for customers and companies. The model proposed by Jebbara and Cimiano. for the extraction of aspects, winner of the SemEval2016 competition, suffers from the absence of lexico-grammatic input characteristics and poor performance in the detection of compound aspects. We propose the model based on a recurrent neural network for the task of extracting aspects of an entity for sentiment analysis. The proposed model is an improvement of the Jebbara and Cimiano model. The modification consists in adding a CRF to take into account the dependencies between labels and we have extended the characteristics space by adding grammatical level characteristics and lexical level characteristics. Experiments on the two SemEval2016 data sets tested our approach and showed an improvement in the F-score measurement of about 3.5%. L'analyse des opinions consiste à extraire des connaissances à partir des commentaires laissés par les utilisateurs à propos d'un produit, service, texte,... L'analyse des opinions basée sur les aspects consiste alors à décomposer le commentaire afin d'extraire les aspects que cet utilisateur a évalué. Le modèle proposé par Jebbara et Cimiano, vainqueur de la compétition SemEval2016 n'extrait pas correctement des aspects composés et ne prend pas en compte les caractéristiques lexico-grammaticales des textes en entrée, ce qui limite aussi ses performances dans la détection des aspects. Nous proposons une amélioration du modèle de Jebbara et Cimiano. en y introduisant des unités CRF afin de prendre en compte les dépendances entre les étiquettes et ajoutant aux entrées du modèle des caractéristiques lexico-grammaticales. Les expérimentations faites sur les deux jeux de données de SemEval2016 ont permis de tester cette approche et montrer une amélioration de la mesure F-score d'environ 3.5%. ABSTRACT. The Internet contains a wealth of information in the form of unstructured texts such as customer comments on products, events and more. By extracting and analyzing the opinions expressed in customer comments in detail, it is possible to obtain valuable opportunities and information for customers and companies. The model proposed by Jebbara and Cimiano. for the extraction of aspects, winner of the SemEval2016 competition, suffers from the absence of lexico-grammatic input characteristics and poor performance in the detection of compound aspects. We propose the model based on a recurrent neural network for the task of extracting aspects of an entity for sentiment analysis. The proposed model is an improvement of the Jebbara and Cimiano model. The modification consists in adding a CRF to take into account the dependencies between labels and we have extended the characteristics space by adding grammatical level characteristics and lexical level characteristics. Experiments on the two SemEval2016 data sets tested our approach and showed an improvement in the F-score measurement of about 3.5%.

Extraction of lexico-grammatic features and coupling of CRF (Conditional Random Field) units to the deep neural network for aspect extraction