Aspect-Aware MOOC Recommendation in a Heterogeneous Network

TL;DR

This paper introduces AMR, a novel aspect-aware graph neural network framework for MOOC recommendation that automatically models multiple semantic aspects, outperforming existing methods on large datasets.

Contribution

AMR automatically discovers and models path-specific aspects using bi-LSTM encoders, reducing reliance on manual metapath design and improving recommendation accuracy.

Findings

AMR outperforms state-of-the-art GNN baselines on MOOCCube and PEEK datasets.

AMR effectively captures rich path-specific aspect information.

AMR achieves higher HR@K and nDCG@K metrics.

Abstract

MOOC recommendation systems have received increasing attention to help learners navigate and select preferred learning content. Traditional methods such as collaborative filtering and content-based filtering suffer from data sparsity and over-specialization. To alleviate these limitations, graph-based approaches have been proposed; however, they still rely heavily on manually predefined metapaths, which often capture only superficial structural relationships and impose substantial burdens on domain experts as well as significant engineering costs. To overcome these limitations, we propose AMR (Aspect-aware MOOC Recommendation), a novel framework that models path-specific multiple aspects by embedding the semantic content of nodes within each metapath. AMR automatically discovers metapaths through bi-directional walks, derives aspect-aware path representations using a bi-LSTM-based encoder, and incorporates these representations as edge features in the learner-learner and KC-KC subgraphs to achieve fine-grained semantically informed KC recommendations. Extensive experiments on the large-scale MOOCCube and PEEK datasets show that AMR consistently outperforms state-of-the-art graph neural network baselines across key metrics such as HR@K and nDCG@K. Further analysis confirms that AMR effectively captures rich path-specific aspect information, allowing more accurate recommendations than those methods that rely solely on predefined metapaths. The code will be available upon accepted.