Meta-relationship for Course Recommendation in MOOCs

Course recommendations are used to help students with different needs to choose courses. However, students’ needs are not always determined by their personal interests, they are also influenced by different curriculum settings, different teacher teams and other factors. Current course recommendation methods lack the consideration of complex relational semantic information that affects students’ needs, resulting in unsatisfied recommendation. To address this issue, we propose Meta-Relationship Course Recommendation (MRCRec) to enrich the expression of relational information. Focusing on complex semantic information of multi-entity relationship and entity association, we construct creatively the multi-entity relational self-symmetric meta-path (MSMP) and associative relational self-symmetric meta-graph (ASMG), which are referred as meta-relationship (MR). We also design an algorithm of meta-relationship correlation measure (MRCor) to obtain semantic correlational information. Then we adopt the graph embedding to mine and fuse the latent representations of users and that of courses as user preference and course characteristic respectively. Finally, we optimize matrix factorization to complete recommended task. Comprehensive experiments are conducted on the MOOCCube dataset and the results show that MRCRec can effectively recommend courses for users.