Leveraging Entities in Document Retrieval
Abstract
This chapter focuses on the classic problem of ad hoc document retrieval and discusses how entities may be leveraged to improve retrieval performance. Entities facilitate a semantic understanding of both the user’s information need, as expressed by the keyword query, and of the document’s content. We present three different families of approaches: (1) expansion-based methods, which utilize entities as a source of expansion terms to enrich the representation of the query; (2) projection-based methods, which treat entities as a latent layer, while leaving the original document/query representations intact; and (3) entity-based methods, which consider explicitly the entities that are recognized in documents, and embrace entity-based representations in “duet” with traditional term-based representations.
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