A ParseScore maps a candidate parse to a score.
A ParseStatistic accrues a particular statistic over (candidate parse, gold parse) pairs.
The PathAccuracyScore computes the percentage of a candidate parse's tokens that have a completely correct breadcrumb path (i.
UnlabeledBreadcrumbAccuracy stores the statistics necessary to compute Unlabeled Attachment Score (UAS), which is the percentage of correct breadcrumbs over a set of candidate parses.