| # Full baseline suite and provenance policy |
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| Every benchmark table in this project keeps the complete comparison suite visible, even when a particular baseline has not yet been rerun on the current dataset. |
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| | Baseline | Representation / search | Speed quantity that must be reported | |
| |---|---|---| |
| | TF-IDF | sparse lexical, exact scan or inverted index | end-to-end query + search | |
| | BM25 | sparse lexical inverted index | end-to-end query + postings traversal | |
| | FAISS Flat | fixed dense embeddings, exact inner product/cosine | query encoder + exact vector search | |
| | FAISS HNSW | fixed dense embeddings, HNSW | query encoder + ANN search | |
| | FAISS IVF-Flat | fixed dense embeddings, IVF | query encoder + ANN search | |
| | FAISS IVF-PQ | fixed dense embeddings, IVF + product quantization | query encoder + ANN search | |
| | hnswlib HNSW | fixed dense embeddings, HNSW | query encoder + ANN search | |
| | ScaNN | fixed dense embeddings, pruning/quantization | query encoder + ANN search | |
| | Contriever | neural dense retrieval + ANN | query encoder + ANN search | |
| | SPLADE++ | neural sparse expansion + inverted index | sparse query encoder + search | |
| | BGE-base | neural dense retrieval + ANN | query encoder + ANN search | |
| | Modern ColBERT | neural multi-vector late interaction | query encoder + candidate generation + late interaction | |
| | OURS | sparse TF-IDF geometry + signed residuals | TF-IDF query construction + routing + shortlist + top-10 selection | |
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| ## Missing values are shown, not hidden |
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| A dash in a result table means the baseline has not yet been rerun under the same representation/hardware/protocol. It is intentionally left visible. We do not fill missing latency with a number from a different CPU/GPU and we do not compare ANN-only latency against our end-to-end latency. |
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| ## Current provenance classes |
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| - **local**: executed on the current dataset by the code in this repository/session; |
| - **historical local**: executed in an earlier frozen version of the same project; |
| - **published/context ledger**: retained from the baseline ledger used during the experimental campaign; not presented as a same-hardware speed result; |
| - **pending same-representation rerun**: part of the required suite but deliberately blank until a controlled experiment exists. |
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