Early Stage Researcher at IIIA-CSIC

CSIC - Agencia Estatal Consejo Superior de Investigaciones Científicas (Spain) IIIA-CSIC - Artificial Intelligence Research Institute

Artificial Intelligence Research Institute (IIIA)
Agencia Estatal del Consejo Superior de Investigaciones Científicas (CSIC)
Carrer de Can Planes, Campus UAB
08193, Bellaterra, Catalonia, Spain


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Argumentation-based multi-agent recommender system

PhD research topic


This PhD thesis will explore an interactive distributed model in which recommenders become active software agents that accompany the recommendations with arguments. This approach is radically different with previous recommender system approaches (content-based or not) where the experiences of users are represented as passive data in a database. These recommender agents will be able then to engage in argumentative dialogues with other recommenders to agree (or not) on a recommendation to the user. A mediator may pair recommenders according to different criteria (e.g., similarity of profiles with the user, dissimilarity of their experiences) and then aggregate the outcomes of the different dialogues into a meaningful recommendation to the user that will be duly justified by arguments.

Expected Results:

(1) Initially, publicly available data sets will be used for validation of the approach, in particular, the Sushi data set73, which offers a well-designed source of preference data that can be used to form arguments for supporting recommendations.

(2) The approach will address two main issues still remaining in the recommender systems – the sensitivity of the precision of preference estimation with respect to the measurement error in the profile data; and the effect of central tendency effect (the tendency to select neutral positions on rating scales).

(3) A comparison with current implementations of content-based recommender systems will be done.

(4) At least two use cases will be identified where the results of the PhD work will be applied and evaluated.