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Recommender systems research and practice are fast-developing topics with growing adoption in a wide variety of information access scenarios. In this paper, we present an overview of research specifically focused on the emphevaluation of recommender …

We present the Height Optimized Trie (HOT), a fast and space-efficient in-memory index structure. The core algorithmic idea of HOT is to dynamically vary the number of bits considered at each node, which enables a consistently high fanout and thereby …