Our summary
Questions about the capitals of Kenya and Jamaica look similar, but one answer will not serve both. A cache stores earlier answers to avoid generating them again. Skelton asks whether an extra check can catch these near-matches before someone receives an answer meant for a different question.
He compares several ways to check five hundred question pairs and their stored answers. In the article, Jev beats topic similarity without clearly beating the stronger small-model checks on accuracy. It also makes substantially worse decisions when the original cached question is left out.
Jev's raw probabilities match observed outcomes less well than the language models' scores in the article. Most labels came from models, with one human reviewer and a small separate test set. DigitalOcean sells Jev. This is a directional comparison, not a full running-cache test or a cutoff that works everywhere.
Key takeaways
- Supply the old question and saved answer alongside the new question. Sharing a topic does not establish that an answer fits.
- Choose a cutoff using your own labeled requests. Include near-matches where a name, amount, date or account has changed.
- Count the checking delay on cache hits and misses alike. If the check fails, get a new answer instead of serving the unverified match.