  Knowledge base question generation (KBQG) aims to generate natural language
questions from a set of triplet facts extracted from KB. Existing methods have
significantly boosted the performance of KBQG via pre-trained language models
(PLMs) thanks to the richly endowed semantic knowledge. With the advance of
pre-training techniques, large language models (LLMs) (e.g., GPT-3.5)
undoubtedly possess much more semantic knowledge. Therefore, how to effectively
organize and exploit the abundant knowledge for KBQG becomes the focus of our
study. In this work, we propose SGSH--a simple and effective framework to
Stimulate GPT-3.5 with Skeleton Heuristics to enhance KBQG. The framework
incorporates "skeleton heuristics", which provides more fine-grained guidance
associated with each input to stimulate LLMs to generate optimal questions,
encompassing essential elements like the question phrase and the auxiliary
verb.More specifically, we devise an automatic data construction strategy
leveraging ChatGPT to construct a skeleton training dataset, based on which we
employ a soft prompting approach to train a BART model dedicated to generating
the skeleton associated with each input. Subsequently, skeleton heuristics are
encoded into the prompt to incentivize GPT-3.5 to generate desired questions.
Extensive experiments demonstrate that SGSH derives the new state-of-the-art
performance on the KBQG tasks.
