The second approach is based on the idea of constrained decoding for three parsers, i.e., a traditional linear graphbased parser (LGPar), a globally normalized neural network transition-based parser (GN3Par) and a traditional linear transition-based parser (LTPar).
as our reviewers kindly point out, more extensive experiments and systematic analysis are needed to really understand this interesting issue and provide stronger findings, which we leave for future work.