Key research themes
1. How do collaborative filtering methods address personalization and data sparsity in recommendation systems?
This theme explores the design, implementation, and evaluation of collaborative filtering (CF) approaches, which leverage user interaction data to generate personalized recommendations. Special focus is given to tackling challenges such as data sparsity, scalability, and cold-start problems through algorithmic enhancements and hybridization with other methods. Understanding CF's contributions is critical, as it remains one of the most widely used and studied techniques in industry and academia.
2. What are the best practices and metrics for evaluating recommendation systems across offline, user studies, and online experiments?
Evaluation methods are fundamental for comparing recommender system algorithms, as the choice affects deployment decisions and user experience outcomes. This theme covers experimental setups, evaluation metrics, and the interpretation of results across offline simulations, controlled user studies, and live online deployments. Emphasis is placed on aligning evaluation methodologies with system objectives beyond prediction accuracy, such as robustness, diversity, and scalability.
3. How can hybrid and advanced machine learning techniques, including deep learning and graph neural networks, enhance personalization and adaptability in recommender systems?
This theme investigates the integration of hybrid methods combining collaborative filtering, content-based filtering, and novel machine learning paradigms such as graph neural networks (GNNs) and transformer-based architectures to build more adaptive, personalized, and context-aware recommendation models. The focus is on methodological innovations that handle data heterogeneity, dynamic user behavior, and domain-specific personalization.