Abstract
Item recommendation helps people to discover their potentially interested items among large numbers of items. One most common application is to recommend items on implicit feedback datasets (e.g., listening history, watching history or visiting history). In this paper, we assume that the implicit feedback matrix has local property, where the original matrix is not globally low-rank but some sub-matrices are low-rank. In this paper, we propose Local Weighted Matrix Factorization for implicit feedback (LWMF) by employing the kernel function to intensify local property and the weight function to model user preferences. The problem of sparsity can also be relieved by sub-matrix factorization in LWMF, since the density of sub-matrices is much higher than the original matrix. We propose a heuristic method DCGASC to select sub-matrices which approximate the original matrix well. The greedy algorithm has approximation guarantee of factor \(1-\frac{1}{e}\) to get a near-optimal solution. The experimental results on two real datasets show that the recommendation precision and recall of LWMF are both improved more than 30 % comparing with the best case of WMF.
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Notes
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Pair (u, m) means that the user u discovered the item m.
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Acknowledgement
This work was supported by the NSFC grants (No. 61472141, 61370101 and 61021004), Shanghai Leading Academic Discipline Project (No. B412), and Shanghai Knowledge Service Platform Project (No. ZF1213).
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Wang, K., Duan, X., Ma, J., Sha, C., Wang, X., Zhou, A. (2016). Local Weighted Matrix Factorization for Implicit Feedback Datasets. In: Navathe, S., Wu, W., Shekhar, S., Du, X., Wang, X., Xiong, H. (eds) Database Systems for Advanced Applications. DASFAA 2016. Lecture Notes in Computer Science(), vol 9642. Springer, Cham. https://doi.org/10.1007/978-3-319-32025-0_24
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