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Is this the notion of "embedding" they are discussing? https://en.m.wikipedia.org/wiki/Word_embedding https://en.m.wikipedia.org/wiki/Word_embedding What is a

• mcxlog 8y ago
  In this field, an entity typically refers to an entry in Wikipédia, such as a person, an organization, a place, etc (types which are considered may vary). And yes that page is the embedding definition they are referring to.
• ikuyamada 8y ago
  Author here. More broadly, embedding is a mapping from objects (e.g., words and entities) to vectors of real numbers. And as described in the mcxlog's comment, an entity refers to an entry in Wikipedia in this paper.