Recommending groups to users using user-group engagement and time-dependent matrix factorization

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Abstract

Social networks often provide group features to help users with similar interests associate and consume content together. Recommending groups to users poses challenges due to their complex relationship: user-group affinity is typically measured implicitly and varies with time; similarly, group characteristics change as users join and leave. To tackle these challenges, we adapt existing matrix factorization techniques to learn user-group affinity based on two different implicit engagement metrics: (i) which group-provided content users consume; and (ii) which content users provide to groups. To capture the temporally extended nature of group engagement we implement a time-varying factorization.We test the assertion that latent preferences for groups and users are sparse in investigating elastic-net regularization. Our experiments indicate that the time-varying implicit engagement-based model provides the best top-K group recommendations, illustrating the benefit of the added model complexity. Introduction Online web services recommend content item.

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Wang, X., Donaldson, R., Nell, C., Gorniak, P., Ester, M., & Bu, J. (2016). Recommending groups to users using user-group engagement and time-dependent matrix factorization. In 30th AAAI Conference on Artificial Intelligence, AAAI 2016 (pp. 1331–1337). AAAI press. https://doi.org/10.1609/aaai.v30i1.10160

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