An Argument-Marker Model for Syntax-Agnostic Proto-Role Labeling
Juri Opitz, Anette Frank · 2019
Semantic proto-role labeling (SPRL) is an alternative to semantic role labeling (SRL) that moves beyond a categorical definition of roles, following Dowty's feature-based view of proto-roles.This theory determines agenthood vs. patienthood based on a participant's instantiation of more or less typical agent vs. patient properties, such as, for example, volition in an event.To perform SPRL, we develop an ensemble of hierarchical models with selfattention and concurrently learned predicateargument-markers. Our method is competitive with the state-of-the art, overall outperforming previous work in two formulations of the task (multi-label and multi-variate Likert scale prediction).In contrast to previous work, our results do not depend on gold argument heads derived from supplementary gold tree banks.