2020

Pre-training Tasks for Embedding-based Large-scale Retrieval

Chang, Wei-Cheng, Yu, Felix X., Chang, Yin-Wen et al.

Understand

We consider the large-scale query-document retrieval problem: given a query (e.g., a question), return the set of relevant documents (e.g., paragraphs containing the answer) from a large document corpus.

  • This problem is often solved in two steps.
  • The retrieval phase first reduces the solution space, returning a subset of candidate documents.
  • The scoring phase then re-ranks the documents.

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