where  where word embedding e w p.w ∈ R de , pos embedding e t p.t ∈ R de and label embedding e l p.l ∈ R de are extracted from embedding matrices E w , E t and E l according to the indices of the corresponding word p.w, pos p.t and label p.l respectively.
in the case of unlabeled attachment parsing, we ignore the last term e l p.l in Eq.