Answer Span Correction in Machine Reading Comprehension
Revanth Gangi Reddy, Arafat Sultan, Efsun Sarioglu Kayi, Rong Zhang, Vittorio Castelli, Avirup Sil · 2020
Answer validation in machine reading comprehension (MRC) consists of verifying an extracted answer against an input context and question pair.Previous work has looked at re-assessing the "answerability" of the question given the extracted answer.Here we address a different problem: the tendency of existing MRC systems to produce partially correct answers when presented with answerable questions.We explore the nature of such errors and propose a post-processing correction method that yields statistically significant performance improvements over state-of-the-art MRC systems in both monolingual and multilingual evaluation.