Long-form question answering (LFQA) aims to generate a paragraph-length answer for a given question. While current work on LFQA using large pre-trained model for generation are effective at producing fluent and somewhat relevant content, one primary challenge lies in how to generate a faithful answer that has less hallucinated content. We propose a new end-to-end framework that jointly models answer generation and machine reading. The key idea is to augment the generation model with fine-grained, answer-related salient information which can be viewed as an emphasis on faithful facts. State-of-the-art results on two LFQA datasets, ELI5 and MS MARCO, demonstrate the effectiveness of our method, in comparison with strong baselines on automatic and human evaluation metrics. A detailed analysis further proves the competency of our methods in generating fluent, relevant, and more faithful answers.

我们提出了一种新的端到端框架，用于解决长篇问答的生成问题，重点是如何生成更加真实准确的答案。通过增加细粒度的相关信息来强化生成模型，实验结果表明我们的方法比强基线模型在自动和人工评估指标上表现更好，并且能够生成流畅，相关且更加真实准确的答案。

阅读前先生成！使用机器阅读实现忠实的长篇问答