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• W2401687514 abstract "Effectively exploring data generated by microblogging services is challenging due to its high volume and production rate. To address this issue, we propose a solution that helps users effectively consume information from a microblogging stream, by filtering out redundant data. We formalize our approach as a novel optimization problem termed Multi-Query Diversification Problem (MQDP). In MQDP, the input consists of a list of microblogging posts and a set of user queries (e.g. news topics), where each query matches a subset of posts. The objective is to compute the smallest subset of posts that cover all other posts with respect to a “diversity dimension” that may represent time or, say, sentiment. Roughly, the solution (cover) has the property that each covered post has nearby posts in the cover that are collectively related to all queries relevant to this covered post. This is distinct from previous single-query diversity problems, as we may have two nearby posts that are related to intersecting but not nested sets of queries, in which case none covers the other. Another key difference is that we do not define diversity in terms of post similarity, since posts are too short for this approach to be meaningful; instead, we focus on finding representative posts for ordered diversity dimensions like time and sentiment, which are critical in microblogging. For example, for time as the diversity dimension, the selected posts will show how certain news events unfolded over time. We prove that MQDP is NP-hard and we propose an exact dynamic programming algorithm that is feasible for small problem instances. We also propose two approximate algorithms with provable approximation bounds, and show how they can be adapted for a streaming setting. Through comprehensive experiments on real data, we show that our algorithms efficiently and effectively generate diverse and representative posts." @default.
• W2401687514 created "2016-06-24" @default.
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• W2401687514 date "2014-01-01" @default.
• W2401687514 modified "2023-09-23" @default.
• W2401687514 title "Multi-Query Diversification in Microblogging Posts" @default.
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