Deep learning-based implicit feedback recommendation

Xin Xin
Recommender systems are of vital importance, in the era of the Web, to address the problem of information overload. It can benefit both users by recommending personalized interesting items and service providers by increasing their site traffic. Plenty of use cases have emerged as applied recommender systems, including but not limited to multimedia recommendation (e.g., news, movies, music, and videos) and e-commerce recommendation. A recommendation agent can be trained from user-item
more » ... data which can be categorized as explicit feedback and implicit feedback. Compared with explicit ratings which depict the user preference explicitly, implicit feedback data like clicks, purchases, and dwell time is more prevalent in the real-world scenario. On the other hand, deep learning has achieved great success recently due to the high model expressiveness and fidelity. In this thesis, we investigate deep learning techniques for recommendation from implicit feedback data. We focus on two learning perspectives: deep supervised learning and deep reinforcement learning. Supervised learning tries to infer knowledge from implicit historical interactions. From this perspective, two models namely Convolutional Factorization Machines (CFM) and Relational Collaborative Filtering (RCF) are proposed. CFM tackles the implicit user-item interactions with side information as feature vectors and utilizes convolutional neural networks to learn high-order interaction signals. RCF considers multiple item relations into the recommendation model and tackles the implicit feedback as relation-enriched data. The two models investigate deep learning techniques for recommendation by tackling the data as two different structures: feature vectors and relations. Experimental results demonstrate that the proposed deep learning models are effective to improve the recommendation accuracy. Besides, RCF also helps to provide explainable recommendation and get a better comprehension of user behaviors. Reinforcement learning is reward-driven and focus [...]
doi:10.5525/gla.thesis.82109 fatcat:7hhmk4ka55hxzjawhwwyvwpcem