Recommender systems 23 Recommender system 11 Information technology industries 9 Collaborative filtering 8 Behavioral research 7 recommender system 7 Computer science 6 Recommendation system 6 History of engineering and technology 5 Deep learning 4 Feature extraction 3 Knowledge graphs 3 Personalized recommendation 3 Recommendation 3 Recommendation algorithms 3 Research & information: general 3 Students 3 Blood glucose 2 Cluster analysis 2 Community detection 2 Data mining 2 Decision making 2 Deep neural networks 2 Electronic commerce 2 Engineering education 2 Extraction 2 Graph-based 2 Graphic methods 2 Knowledge graph 2 Mathematics & science 2