In contrast, the performance of MED, the neural model, is relatively independent of the choice of source; this is in line with earlier findings (Cotterell et al., 2016).
even for MED+PT, adding SHIP (i.e., MED+PT+SHIP) slightly increases accuracy by .0061 (.7547-.7486) on SET2, and .0029 (.8483-.8454) on SET3 (L53).