Impar: A deterministic algorithm for implicit semantic role labelling

This paper presents a novel deterministic algorithm for implicit Semantic Role La-beling. The system exploits a very sim-ple but relevant discursive property, the ar-gument coherence over different instances of a predicate. The algorithm solves the implicit arguments sequentially, exploit-ing not only explicit but also the implicit arguments previously solved. In addition, we empirically demonstrate that the algo-rithm obtains very competitive and robust performances with respect to supervised approaches that require large amounts of costly training data.