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On the Optimality of Top-k Algorithms for Interactive Web Applications

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Executive Summary

In an interactive Web application, the application state changes according to user choices/actions. To assist users in their interaction with such applications, there is a need to provide them with recommendations for the top-k (according to some ranking metric) interactions. These recommendations must be continually updated, as the user interacts with the application, to be consistent with the actual choices she makes. Efficiency of computation is critical here to provide fast response time and a pleasant user experience.

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