WHAT THIS IS: a ready-to-query semantic search index over Wikipedia. A FAISS index of passage vectors plus the passages themselves, so you can retrieve Wikipedia text by meaning rather than by keyword, offline. Vectors are intfloat/multilingual-e5-large (1024-d), so the query does not have to be in the corpus language.
THIS COMMIT: the English rebuild is now measured against the published English store, which the release note previously said could not be compared. The old store's cleaning script no longer exists, so its control questions are generated from that store's OWN chunk text - exactly what the old index encoded - over 400 articles sampled by uniform stride from the 5,328,397 titles present in both stores. Whole corpus, nprobe 128: old recall@1 19.5 / recall@5 33.5 / MRR 25.1 against v11b 39.2 / 59.5 / 47.9. That is +22.8 MRR while searching a corpus 2.9 times larger, and this set leaks less than the ja/zh ones (gold title verbatim in 3.0% of questions against 17.8% and 12.3%)…
