It may only label the beginning (B), the internal (I), or the last (E) word Algorithm 1 Data Labeing using the Dictionary 1: Input: named entity dictionary D e , a sentence s = {w 1 , • • • , w n }, and the context size k 2: Result: partial labeled sentence 3: if j == 0 then 11: of an entity.
we cannot distinguish which type, B, I, or E, the labeled entity word belongs to.