Our system has the advantage of always producing an NL sentence given any input MR, even if there exist unseen MR productions in the input MR. We can achieve this by simply skipping those unseen MR productions during the generation process.
in order to make a fair comparison against WASP −1 ++, which can only generate NL sentences for 97% of the input MRs, we also do not generate any NL sentence in the case of observing an unseen MR production.