cosine similarity term
Vectorized Context-Aware Embeddings for GAT-Based Collaborative Filtering
Ebrat, Danial, Ahmadian, Sepideh, Rueda, Luis
Traditional collaborative filtering (CF) methods, relying on user - item interaction matrices, effectively capture latent patterns but face challenges such as data sparsity, cold - start problems, and limited contextual integration . To address these issues, M atrix F actorization (MF) techniques such as Singular Value Decomposition (SVD) and Alternating Least Squares (ALS) [1, 2 ] have been employed, improving accuracy but still struggling with sparsity and contextual richness. This has spurred the integration of side information, such as item content, social networks, and knowledge graphs, to enhance CF performance [3, 4 ] . Graph - based CF methods have emerged as a promising alternative, leveraging graph structures to model user - item interactions more effectively. Early approaches, such as ItemRank [5] and BiRank [6], used label propagation but lacked optimization capabilities . More advanced techniques, like HOP - Rec [7], integrated random walks with BPR . However, these models remain highly sensitive to hyperparameter tuning and often fail to capture high - order collaborative signals effectively . Graph Neural Networks (GNNs) have revolutionized recommendation systems by capturing complex user - item interactions, particularly in sparse data scenarios . Models like GC - MC [8] and PinSage [9] enhance user - item and item - item relationships, while SpectralCF [10] leverages spectral convolutions but faces scalability challenges.