Event participant modelling with neural networks

Ottokar Tilk1, Vera Demberg2, Asad Sayeed2, Dietrich Klakow2, Stefan Thater3
1Tallinn University of Technology, 2Saarland University, 3Universität des Saarlandes


Abstract

A common problem in cognitive modelling is lack of access to accurate broad-coverage models of event-level surprisal. As shown in, e.g., Bicknell et al. (2010), event-level knowledge does affect human expectations for verbal arguments. For example, the model should be able to predict that "mechanics" are likely to check "tires", while "journalists" are more likely to check "typos". Similarly, we would like to predict what locations are likely for "playing football" or "playing flute" in order to estimate the surprisal of actually-encountered locations. Furthermore, such a model can be used to provide a probability distribution over fillers for a thematic role which is not mentioned in the text at all.

To this end, we train two neural network models (an incremental one and a non-incremental one) on large amounts of automatically role-labelled text. Our models are probabilistic and can handle several roles at once, which also enables them to learn interactions between different role fillers. Evaluation shows a drastic improvement over current state-of-the-art systems on modelling human thematic fit judgements, and we demonstrate via a sentence similarity task that the system learns highly useful embeddings.