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Browsing CESE - Other Publications by Author "Carlos Manuel Soares"
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ItemDimensions as Virtual Items: Improving the predictive ability of top-N recommender systems( 2013) Domingues,MA ; Alípio Jorge ; Carlos Manuel SoaresTraditionally, recommender systems for the web deal with applications that have two dimensions, users and items. Based on access data that relate these dimensions, a recommendation model can be built and used to identify a set of N items that will be of interest to a certain user. In this paper we propose a multidimensional approach, called DaVI (Dimensions as Virtual Items), that consists in inserting contextual and background information as new user-item pairs. The main advantage of this approach is that it can be applied in combination with several existing two-dimensional recommendation algorithms. To evaluate its effectiveness, we used the DaVI approach with two different top-N recommender algorithms, Item-based Collaborative Filtering and Association Rules based, and ran an extensive set of experiments in three different real world data sets. In addition, we have also compared our approach to the previously introduced combined reduction and weight post-filtering approaches. The empirical results strongly indicate that our approach enables the application of existing two-dimensional recommendation algorithms in multidimensional data, exploiting the useful information of these data to improve the predictive ability of top-N recommender systems.
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ItemMachine Learning and Knowledge Discovery in Databases - European Conference, ECML PKDD 2015, Porto, Portugal, September 7-11, 2015, Proceedings, Part I( 2015) Appice,A ; Rodrigues,PP ; Vítor Santos Costa ; Carlos Manuel Soares ; João Gama ; Alípio Jorge
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ItemMachine Learning and Knowledge Discovery in Databases - European Conference, ECML PKDD 2015, Porto, Portugal, September 7-11, 2015, Proceedings, Part II( 2015) Appice,A ; Rodrigues,PP ; Vítor Santos Costa ; João Gama ; Alípio Jorge ; Carlos Manuel Soares
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ItemProceedings of the International Workshop on Meta-learning and Algorithm Selection co-located with 21st European Conference on Artificial Intelligence, MetaSel@ECAI 2014, Prague, Czech Republic, August 19, 2014( 2014) Vanschoren,J ; Pavel Brazdil ; Carlos Manuel Soares ; Kotthoff,L