News

The recent publication Enhancing deep learning sentiment analysis with ensemble techniques in social applications (Araque O., Corcuera-Platas I., Sanchez-Rada J.F., Iglesias C.A.) has reached the Most Downladed category in the journal Expert Systems with Applications (JCR, Q1, Impact Factor 3.928 in 2016).

 

Abstract

Deep learning techniques for Sentiment Analysis have become very popular. They provide automatic feature extraction and both richer representation capabilities and better performance than traditional feature based techniques (i.e., surface methods). Traditional surface approaches are based on complex manually extracted features, and this extraction process is a fundamental question in feature driven methods. These long-established approaches can yield strong baselines, and their predictive capabilities can be used in conjunction with the arising deep learning methods. In this paper we seek to improve the performance of deep learning techniques integrating them with traditional surface approaches based on manually extracted features. The contributions of this paper are sixfold. First, we develop a deep learning based sentiment classifier using a word embeddings model and a linear machine learning algorithm. This classifier serves as a baseline to compare to subsequent results. Second, we propose two ensemble techniques which aggregate our baseline classifier with other surface classifiers widely used in Sentiment Analysis. Third, we also propose two models for combining both surface and deep features to merge information from several sources. Fourth, we introduce a taxonomy for classifying the different models found in the literature, as well as the ones we propose. Fifth, we conduct several experiments to compare the performance of these models with the deep learning baseline. For this, we use seven public datasets that were extracted from the microblogging and movie reviews domain. Finally, as a result, a statistical study confirms that the performance of these proposed models surpasses that of our original baseline on F1-Score.

David García ha ganado el segundo premio de los  Premios de la Cátedra Ingeniero General D. Antonio Remón y Zarco del Valle a la mejor tecnología, producto o servicio desarrollada en la UPM con temática relacionada con Defensa y Seguridad, con su Trabajo Fin de Grado titulado "Diseño e implementación de un modelo social de redes terroristas basado en agentes y técnicas de análisis de redes sociales"

Resolución premio

Miembros del GSI han presentado en el Emotion and Sentiment in Social and Expressive Media: User Engagement and Interaction (ESSEM@ACII 2017) dos artículos científicos:

El congreso se ha celebrado en San Antonio, Texas, entre los días 21 y 26 de Octubre.

Miembros del GSI han presentado el proyecto TRIVALENT en el seminario"Seguridad, Terrorismo y Radicalización: Amenazas, retos y respuestas. Radicalización juvenil y su prevención desde la acción comunitaria", celebrado el 23 y 24 de octubre de 2017 en Granada, organizado por la Fundación Euroárabe de Altos Estudios.