The standard procedure to evaluate discourse parsing performance is to compute Precision, Recall and f -score of the unlabeled and labeled metrics proposed by Marcu (2000b).
10 the unlabeled metric Span measures how accurate the parser is in finding the right structure (i.e., skeleton) of the DT, while the labeled metrics Nuclearity and Relation measure the parser's ability to find the right labels (nuclearity and relation) in addition to the right structure.