Journal
IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING
Volume 34, Issue 11, Pages 5446-5458Publisher
IEEE COMPUTER SOC
DOI: 10.1109/TKDE.2021.3050407
Keywords
Dictionaries; Protocols; Machine learning; Training; Task analysis; Heuristic algorithms; Optimization; Collaborative filtering; sequential recommendation; dynamic preference; dictionary learning
Categories
Funding
- National Natural Science Foundation of China [U19B2035, 61972250]
- National Key Research and Development Program of China [2016YFB1001003, 2018AAA0100704, 2018YFC0830400]
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Capturing the dynamics in user preference is crucial for predicting user future behaviors. Existing recommendation algorithms struggle to model both static and dynamic preferences. This paper proposes a method that translates a user's sequential behavior into their preference using dictionary learning and a deep autoregressive model. Experimental results show that the proposed method accurately captures the evolution of user preferences.
Capturing the dynamics in user preference is crucial to better predict user future behaviors because user preferences often drift over time. Many existing recommendation algorithms - including both shallow and deep ones - often model such dynamics independently, i.e., user static and dynamic preferences are not modeled under the same latent space, which makes it difficult to fuse them for recommendation. This paper considers the problem of embedding a user's sequential behavior into the latent space of user preferences, namely translating sequence to preference. To this end, we formulate the sequential recommendation task as a dictionary learning problem, which learns: 1) a shared dictionary matrix, each row of which represents a partial signal of user dynamic preferences shared across users; and 2) a posterior distribution estimator using a deep autoregressive model integrated with Gated Recurrent Unit (GRU), which can select related rows of the dictionary to represent a user's dynamic preferences conditioned on his/her past behaviors. Qualitative studies on the Netflix dataset demonstrate that the proposed method can capture the user preference drifts over time and quantitative studies on multiple real-world datasets demonstrate that the proposed method can achieve higher accuracy compared with state-of-the-art factorization and neural sequential recommendation methods.
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