A novel context-aware recommender system based on a deep sequential learning approach (CReS)

Tipajin Thaipisutikul, Timothy K. Shih

研究成果: 雜誌貢獻期刊論文同行評審


With an increase in online longitudinal users’ interactions, capturing users’ precise preferences and giving accurate recommendations have become an urgent need for all businesses. Existing sequence-aware methods generally exploit a static low-rank vector for acquiring the overall sequential features, and incorporate context information as auxiliary input. As a result, they have a restricted modeling ability for extracting multi-grained sequential behaviors over contextual information. In other words, they poorly capture the hierarchical relationship between context relations and item relations that currently influence users’ preferences in a unified framework. Besides, they usually utilize users’ short-term preferences with either static or irrelevant long-term representation for the prediction. To tackle the above issues, in this paper, we propose a novel Context-aware Recommender System Based on a Deep Sequential Learning Approach (CReS) to capture users’ dynamic preferences by modeling the hierarchical relationships between contexts and items in a particular session, and for combining users’ short-term sessions with the relevant long-term representations. Specifically, within a certain session, we design a hierarchical attention network between the identified context relations and items relations, namely CReSession. Therefore, with CReSession, we could provide a suitable session representation that mimics the hierarchical user interests on multiple granularities of contextual types and its corresponding items. We then introduce a neural attentive bi-directional GRU network to distill only those highly related to the recent short-term session. Finally, the relevant long-term representations and the short-term session are combined with the sequential residual connection to form the final user representation in a unified manner. With extensive experiments on two real-world datasets, CReS not only achieves significant improvement over the state-of-the-art methods in terms of pre-defined metrics, but also provides an interpretable result regarding why we recommend these items to users.

頁(從 - 到)11067-11090
期刊Neural Computing and Applications
出版狀態已出版 - 9月 2021


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