<p>Community detection in multilayer networks faces significant challenges due to the neglect of user attribute information and the inability to account for the heterogeneity among layers. These limitations often result in suboptimal performance and less meaningful community structures. To overcome these challenges, this paper introduces a novel approach for community detection in multilayer networks using the Semi-Supervised Matrix Factorization Algorithm (SSMFA). Our method integrates structural, content-based, and user overlap information into a unified nonnegative matrix factorization framework, ensuring a holistic representation of the multilayer network. Community structures for individual layers are independently identified through a semi-supervised clustering process that leverages pairwise constraints to improve clustering precision. Subsequently, ensemble clustering is applied to merge the detected community structures into a cohesive and globally optimized network representation. Extensive experimental evaluations demonstrate that SSMFA significantly outperforms existing state-of-the-art techniques across multiple evaluation metrics, highlighting its effectiveness in capturing intricate community structures in multilayer networks. Specifically, on the Tumblr network, our method achieves a 1.2% improvement in modularity compared to the best-performing baseline.</p>