(2018) used UD Treebanks 2.1, which is not the most up-to-date version.
the structure loss L is the pointing loss for the pointer network: where θ denotes the model parameters, y <t represents the subtrees that have been generated by our parser at previous steps, and t is the number needed for parsing the whole sentence (i.e., number of words in dependency parsing and spans containing more than two EDUs in discourse parsing).