Our goal is to predict which relation types are expressed between a pair of entities (e 1 , e 2 ), given all sentences in which both entities are mentioned in a large collection of unlabeled documents.
following previous work on distant supervision, we use known tuples (e 1 , r, e 2 ) in a knowledge base K to automatically annotate sentences where both entities are mentioned with the relation type r. we group all sentences s with one or more mentions of an entity pair (e 1 , e 2 ) into a bag of sentences B e 1 ,e 2 , then automatically annotate this bag with the set of relation types L distant = {r ∈ R : (e 1 , r, e 2 ) ∈ K}, where R is the set of relations we are interested in.