Since there are there metrics, F1, UAS and LAS, possibly reported at the same time, we use the weighted average to consider the effect of all metrics when choosing the best model on the dev set.
we use F 1 for SRL, 0.5 × LAS + 0.5 × U AS for parsing, and 0.5 × F 1 + 0.25 × U AS + 0.25 × LAS for the joint task.