Large language models are increasingly capable of generating fluent-appearing text with relatively little task-specific supervision. But can these models accurately explain classification decisions? We consider the task of generating free-text explanations using a small number of human-written examples (i.e., in a few-shot manner). We find that (1) authoring higher-quality examples for prompting results in higher quality generations; and (2) surprisingly, in a head-to-head comparison, crowdworkers often prefer explanations generated by GPT-3 to crowdsourced human-written explanations contained within existing datasets. Crowdworker ratings also show, however, that while models produce factual, grammatical, and sufficient explanations, they have room to improve, e.g., along axes such as providing novel information and supporting the label. We create a pipeline that combines GPT-3 with a supervised filter that incorporates humans-in-the-loop via binary acceptability judgments. Despite significant subjectivity intrinsic to judging acceptability, our approach is able to consistently filter GPT-3 generated explanations deemed acceptable by humans.

本文探讨利用人类书写的样例以几乎无监督的方式创作自由文本解释的任务，发现高质量的提示有助于提高语言模型的生成效果，同时人类研究表明GPT-3生成的解释在某些情况下能够胜过人工生成的解释；作者还结合GPT-3与学习自评价的筛选器对生成的解释进行过滤，结果表明这一方法能够实现较高水平的解释过滤。

人工智能协作生成自由文本解释的重新构架