Error Analysis Like POS-taggers, the learned supertagger frequently confuses nouns (N) and their modifiers (N/N), but the most frequent error made by the English (6) experiment was (((S\NP)\(S\NP))/N) instead of (NP nb /N).
these are both determiner types, indicating an interesting problem for the supertagger: it often predicts an object type-raised determiner instead of the vanilla NP/N, but in many contexts, both categories are equally valid.