This is the case of tasks such as PoS tagging, chunking or named-entity recognition, for which different approaches obtain accurate results (Brill, 1995;Ramshaw and Marcus, 1999;Reimers and Gurevych, 2017).
previous work on dependency parsing as sequence labeling is vague and reports results that are significantly lower than those provided by transition-, graph-based or sequence-tosequence models Kiperwasser and Goldberg, 2016;Dozat and Manning, 2017;Zhang et al., 2017a).