2020

Deep Retrieval: Learning A Retrievable Structure for Large-Scale Recommendations

Gao, Weihao, Fan, Xiangjun, Wang, Chong et al.

Understand

One of the core problems in large-scale recommendations is to retrieve top relevant candidates accurately and efficiently, preferably in sub-linear time.

  • Previous approaches are mostly based on a two-step procedure: first learn an inner-product model, and then use some approximate nearest neighbor (ANN) search algorithm to find top candidates.
  • In this paper, we present Deep Retrieval (DR), to learn a retrievable structure directly with user-item interaction data (e.g.
  • clicks) without resorting to the Euclidean space assumption in ANN algorithms.

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