Question Generation in Knowledge-Driven Dialog: Explainability and Evaluation

Juliette Faille, Quentin Brabant, Gwénolé Lecorvé, Lina Maria Rojas-Barahona, Claire Gardent

Abstract: We explore question generation in the context of knowledge-grounded dialogs focusing on explainability and evaluation. Inspired by previous work on planning-based summarisation, we present a model which instead of directly generating a question, sequentially predicts first a fact then a question. We evaluate our approach on 37k test dialogs adapted from the KGConv dataset and we show that, although more demanding in terms of inference, our approach performs on par with a standard model which solely generates a question while allowing for a detailed referenceless evaluation of the model behaviour in terms of relevance, factuality and pronominalisation.