Abstract
Query result diversification is critical for improving users’ query satisfaction by making the top ranked results cover more different query semantics. The state-of-the-art works address the problem via bi-criteria (namely, relevance and dissimilarity) optimization. However, such works only consider how dissimilar the returned results are to each other, which is referred to “local diversity”. In contrast, some works consider how similar the not returned results are to the returned results, which is referred to “global diversity”, and however need a user defined threshold to predicate whether a result set is diverse. In this paper, we extend the traditional bi-criteria optimization problem to a tri-criteria problem that considers both local diversity and global diversity. For that, we formally define the metrics of global diversity and global-and-local diversity. Then, we prove the NP-hardness of the proposed problems, and propose two heuristic algorithms, greedy search and vertex substitution, and sophisticated optimization techniques to solve the problems efficiently. To evaluate our approach, we perform comprehensive experiments on three real datasets. The results demonstrate that our approach can indeed find more reasonably diversified results. Moreover, our greedy search algorithm can significantly reduce the time cost by leveraging the critical object, and then our vertex substitution algorithm can incrementally improve the objective value of results returned by greedy search with extra time cost.
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Change history
05 June 2019
In the original version of the chapter titled “An Exploration of Cross-Modal Retrieval for Unseen Concepts”, the acknowledgement was missing. It has been added.
In the original version of the chapter titled “Towards both Local and Global Query Result Diversification”, the funding information in the acknowledgement section was incomplete. This has now been corrected.
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Acknowledgement
This paper was supported by National Natural Science Foundation of China under Grant No. 61202036, 61502349 and 61572376 and Natural Science Foundation of Hubei Province under Grant No. 2018CFB616.
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Zhong, M., Cheng, H., Wang, Y., Zhu, Y., Qian, T., Li, J. (2019). Towards both Local and Global Query Result Diversification. In: Li, G., Yang, J., Gama, J., Natwichai, J., Tong, Y. (eds) Database Systems for Advanced Applications. DASFAA 2019. Lecture Notes in Computer Science(), vol 11447. Springer, Cham. https://doi.org/10.1007/978-3-030-18579-4_28
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DOI: https://doi.org/10.1007/978-3-030-18579-4_28
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