The set of possible transitions T τ i for the i-th word at time step τ is a subset of possible transitions T i that satisfy two constraints: (i) no arcs can be reflexive, i.e., w i cannot be an argument of itself, and (ii) the new arc must not be a member of the set of arcs A τ comprising the partial parse graph y τ constructed at time step τ .
we obtain: The model then creates semantic dependency arcs by iterating over the sentence as follows: 1 1 This algorithm can introduce circles.