Moreover, we adapt the featurization process with biaffine combination described in Qi and Manning (2017) for the arc-swift system to be used on the original Covington and NL-Covington parsers.
arc transitions are featurized by the concatenation of the representation of the head and dependent words of the arc to be created, the No-Arc transition is featurized by the rightmost word in λ 1 and the leftmost word in the buffer B and, finally, for the Shift transition only the leftmost word in B is used.