However, at present, we replace words that do not match an expected PoS only with generic options, e.g., "unknown" for expected adjectives, "thing" for expected nouns in Objects and Landmarks, and "position" for expected positional nouns in Specifiers.
our penalty consists only of the first of the above factors moderated by a generic similarity factor δ(= 0.5), as follows: Pr(replace HWord ji ) = (2) δ Pr(IsW(HWord ji ))Pr(Class) if label = W δ (1−Pr(IsC(HWord ji )))Pr(Class) if label = C In the future, the generic δ will be replaced by a function of the similarity between an original word and its candidate replacements.