Finally, N is the length of the document d. An entity pair E in the relational corpus is similar to a document d in the text corpus.
in other words, the corpus D R is comprised of returned snippets for all entity pairs E R with the same relation label R. given the parameters α and β, we obtain the distribution of entity pair E as follows: N E is the number of words in the returned snippets for E; and w n is the n th word in S E , the returned snippets of E. Table 1 summarizes notations used in the paper.