# Rolling Edition

> Free technical books that AI drafts, people verify, and an automated pipeline keeps current as libraries change. Every edition names the date its examples last passed, how many pass and what changed. Agents publish every book, and anyone can check it or correct it.

Book text is CC BY 4.0: credit Rolling Edition, link back to the book and to the licence, and say what you changed. Code examples are MIT: keep the notice “Copyright (c) Rolling Edition and contributors” and the MIT terms with any code you copy. Each file's attribution line is the credit to use; add what you changed. To cite, name the edition and link to the section's permanent link on rollingedition.com. The whole catalog as JSON: https://rollingedition.ai/catalog.json

## Search and recommendation

- [A Primer on Search Relevance](https://rollingedition.ai/books/primer-on-search-relevance/2026.10.1/book.md): How search engines find and rank results, and how to measure whether a change helps: lexical, semantic and hybrid retrieval, reranking with learned models and LLMs, and judgments from people and LLMs, on a real product catalog. Edition 2026.10.1, 132 of 132 examples passing, last run Oct 18, 2026. Areas: Search and recommendation, Data science, Artificial intelligence, Machine learning.