Update NanoBEIR BM25 candidates and README

Regenerate BM25 top-100 candidate subsets with resolved tokenizer metadata, forced qrels-positive coverage, capped qrels where needed, and updated dataset README.

README.md

@@ -1,179 +1,296 @@
 ---
 configs:
-  - config_name: corpus
-    data_files:
-      - split: NanoClimateFEVER
-        path: corpus/NanoClimateFEVER-*
-      - split: NanoDBPedia
-        path: corpus/NanoDBPedia-*
-      - split: NanoFEVER
-        path: corpus/NanoFEVER-*
-      - split: NanoFiQA2018
-        path: corpus/NanoFiQA2018-*
-      - split: NanoHotpotQA
-        path: corpus/NanoHotpotQA-*
-      - split: NanoMSMARCO
-        path: corpus/NanoMSMARCO-*
-      - split: NanoNFCorpus
-        path: corpus/NanoNFCorpus-*
-      - split: NanoNQ
-        path: corpus/NanoNQ-*
-      - split: NanoQuoraRetrieval
-        path: corpus/NanoQuoraRetrieval-*
-      - split: NanoSCIDOCS
-        path: corpus/NanoSCIDOCS-*
-      - split: NanoArguAna
-        path: corpus/NanoArguAna-*
-      - split: NanoSciFact
-        path: corpus/NanoSciFact-*
-      - split: NanoTouche2020
-        path: corpus/NanoTouche2020-*
-  - config_name: queries
-    data_files:
-      - split: NanoClimateFEVER
-        path: queries/NanoClimateFEVER-*
-      - split: NanoDBPedia
-        path: queries/NanoDBPedia-*
-      - split: NanoFEVER
-        path: queries/NanoFEVER-*
-      - split: NanoFiQA2018
-        path: queries/NanoFiQA2018-*
-      - split: NanoHotpotQA
-        path: queries/NanoHotpotQA-*
-      - split: NanoMSMARCO
-        path: queries/NanoMSMARCO-*
-      - split: NanoNFCorpus
-        path: queries/NanoNFCorpus-*
-      - split: NanoNQ
-        path: queries/NanoNQ-*
-      - split: NanoQuoraRetrieval
-        path: queries/NanoQuoraRetrieval-*
-      - split: NanoSCIDOCS
-        path: queries/NanoSCIDOCS-*
-      - split: NanoArguAna
-        path: queries/NanoArguAna-*
-      - split: NanoSciFact
-        path: queries/NanoSciFact-*
-      - split: NanoTouche2020
-        path: queries/NanoTouche2020-*
-  - config_name: qrels
-    data_files:
-      - split: NanoClimateFEVER
-        path: qrels/NanoClimateFEVER-*
-      - split: NanoDBPedia
-        path: qrels/NanoDBPedia-*
-      - split: NanoFEVER
-        path: qrels/NanoFEVER-*
-      - split: NanoFiQA2018
-        path: qrels/NanoFiQA2018-*
-      - split: NanoHotpotQA
-        path: qrels/NanoHotpotQA-*
-      - split: NanoMSMARCO
-        path: qrels/NanoMSMARCO-*
-      - split: NanoNFCorpus
-        path: qrels/NanoNFCorpus-*
-      - split: NanoNQ
-        path: qrels/NanoNQ-*
-      - split: NanoQuoraRetrieval
-        path: qrels/NanoQuoraRetrieval-*
-      - split: NanoSCIDOCS
-        path: qrels/NanoSCIDOCS-*
-      - split: NanoArguAna
-        path: qrels/NanoArguAna-*
-      - split: NanoSciFact
-        path: qrels/NanoSciFact-*
-      - split: NanoTouche2020
-        path: qrels/NanoTouche2020-*
-  - config_name: bm25
-    data_files:
-      - split: NanoArguAna
-        path: bm25/NanoArguAna-*
-      - split: NanoClimateFEVER
-        path: bm25/NanoClimateFEVER-*
-      - split: NanoDBPedia
-        path: bm25/NanoDBPedia-*
-      - split: NanoFEVER
-        path: bm25/NanoFEVER-*
-      - split: NanoFiQA2018
-        path: bm25/NanoFiQA2018-*
-      - split: NanoHotpotQA
-        path: bm25/NanoHotpotQA-*
-      - split: NanoMSMARCO
-        path: bm25/NanoMSMARCO-*
-      - split: NanoNFCorpus
-        path: bm25/NanoNFCorpus-*
-      - split: NanoNQ
-        path: bm25/NanoNQ-*
-      - split: NanoQuoraRetrieval
-        path: bm25/NanoQuoraRetrieval-*
-      - split: NanoSCIDOCS
-        path: bm25/NanoSCIDOCS-*
-      - split: NanoSciFact
-        path: bm25/NanoSciFact-*
-      - split: NanoTouche2020
-        path: bm25/NanoTouche2020-*
+- config_name: bm25
+  data_files:
+  - split: NanoArguAna
+    path: bm25/NanoArguAna.parquet
+  - split: NanoClimateFEVER
+    path: bm25/NanoClimateFEVER.parquet
+  - split: NanoDBPedia
+    path: bm25/NanoDBPedia.parquet
+  - split: NanoFEVER
+    path: bm25/NanoFEVER.parquet
+  - split: NanoFiQA2018
+    path: bm25/NanoFiQA2018.parquet
+  - split: NanoHotpotQA
+    path: bm25/NanoHotpotQA.parquet
+  - split: NanoMSMARCO
+    path: bm25/NanoMSMARCO.parquet
+  - split: NanoNFCorpus
+    path: bm25/NanoNFCorpus.parquet
+  - split: NanoNQ
+    path: bm25/NanoNQ.parquet
+  - split: NanoQuoraRetrieval
+    path: bm25/NanoQuoraRetrieval.parquet
+  - split: NanoSCIDOCS
+    path: bm25/NanoSCIDOCS.parquet
+  - split: NanoSciFact
+    path: bm25/NanoSciFact.parquet
+  - split: NanoTouche2020
+    path: bm25/NanoTouche2020.parquet
+- config_name: corpus
+  data_files:
+  - split: NanoArguAna
+    path: corpus/NanoArguAna.parquet
+  - split: NanoClimateFEVER
+    path: corpus/NanoClimateFEVER.parquet
+  - split: NanoDBPedia
+    path: corpus/NanoDBPedia.parquet
+  - split: NanoFEVER
+    path: corpus/NanoFEVER.parquet
+  - split: NanoFiQA2018
+    path: corpus/NanoFiQA2018.parquet
+  - split: NanoHotpotQA
+    path: corpus/NanoHotpotQA.parquet
+  - split: NanoMSMARCO
+    path: corpus/NanoMSMARCO.parquet
+  - split: NanoNFCorpus
+    path: corpus/NanoNFCorpus.parquet
+  - split: NanoNQ
+    path: corpus/NanoNQ.parquet
+  - split: NanoQuoraRetrieval
+    path: corpus/NanoQuoraRetrieval.parquet
+  - split: NanoSCIDOCS
+    path: corpus/NanoSCIDOCS.parquet
+  - split: NanoSciFact
+    path: corpus/NanoSciFact.parquet
+  - split: NanoTouche2020
+    path: corpus/NanoTouche2020.parquet
+- config_name: qrels
+  data_files:
+  - split: NanoArguAna
+    path: qrels/NanoArguAna.parquet
+  - split: NanoClimateFEVER
+    path: qrels/NanoClimateFEVER.parquet
+  - split: NanoDBPedia
+    path: qrels/NanoDBPedia.parquet
+  - split: NanoFEVER
+    path: qrels/NanoFEVER.parquet
+  - split: NanoFiQA2018
+    path: qrels/NanoFiQA2018.parquet
+  - split: NanoHotpotQA
+    path: qrels/NanoHotpotQA.parquet
+  - split: NanoMSMARCO
+    path: qrels/NanoMSMARCO.parquet
+  - split: NanoNFCorpus
+    path: qrels/NanoNFCorpus.parquet
+  - split: NanoNQ
+    path: qrels/NanoNQ.parquet
+  - split: NanoQuoraRetrieval
+    path: qrels/NanoQuoraRetrieval.parquet
+  - split: NanoSCIDOCS
+    path: qrels/NanoSCIDOCS.parquet
+  - split: NanoSciFact
+    path: qrels/NanoSciFact.parquet
+  - split: NanoTouche2020
+    path: qrels/NanoTouche2020.parquet
+- config_name: queries
+  data_files:
+  - split: NanoArguAna
+    path: queries/NanoArguAna.parquet
+  - split: NanoClimateFEVER
+    path: queries/NanoClimateFEVER.parquet
+  - split: NanoDBPedia
+    path: queries/NanoDBPedia.parquet
+  - split: NanoFEVER
+    path: queries/NanoFEVER.parquet
+  - split: NanoFiQA2018
+    path: queries/NanoFiQA2018.parquet
+  - split: NanoHotpotQA
+    path: queries/NanoHotpotQA.parquet
+  - split: NanoMSMARCO
+    path: queries/NanoMSMARCO.parquet
+  - split: NanoNFCorpus
+    path: queries/NanoNFCorpus.parquet
+  - split: NanoNQ
+    path: queries/NanoNQ.parquet
+  - split: NanoQuoraRetrieval
+    path: queries/NanoQuoraRetrieval.parquet
+  - split: NanoSCIDOCS
+    path: queries/NanoSCIDOCS.parquet
+  - split: NanoSciFact
+    path: queries/NanoSciFact.parquet
+  - split: NanoTouche2020
+    path: queries/NanoTouche2020.parquet
+  default: true
+language:
+- en
+tags:
+- information-retrieval
+- retrieval
+- nano
+- bm25
+- hakari-bench
 ---
 
-🚧 This dataset is currently under construction. Specifications may change.
+# NanoBEIR-en
 
-# NanoBEIR-en (with bm25 subset)
+This dataset is a Nano-style retrieval dataset. Nano-series evaluation can
+be run easily with [HAKARI-Bench](https://github.com/hotchpotch/hakari-bench).
 
-A BM25-first retrieval subset derived from [sentence-transformers/NanoBEIR-en](https://huggingface.co/datasets/sentence-transformers/NanoBEIR-en) for reproducible NanoBEIR evaluation.
+NanoBEIR-en is derived from MNanoBEIR / NanoBEIR. It follows the
+Hugging Face Datasets layout convention used by
+[sentence-transformers/NanoBEIR-en](https://huggingface.co/datasets/sentence-transformers/NanoBEIR-en):
+each Nano split has separate `corpus`, `queries`, and `qrels` tables, and BM25
+candidates are provided separately in a `bm25` table. This layout follows
+the NanoBEIR-style evaluation approach summarized in
+[NanoBEIR](https://huggingface.co/blog/sionic-ai/eval-sionic-nano-beir).
 
-## What this dataset is
+NanoBEIR-en is a compact English benchmark derived from BEIR retrieval datasets. It keeps the query-corpus-qrels retrieval format while using small task splits for fast, repeatable evaluation.
 
-- Language: `en`
-- BM25 top-k: `100`
-- Number of evaluation splits: `13`
-- This folder contains generated BM25 retrieval results and reproducibility metadata.
 
-## Data structure
 
-- `corpus`: `_id`, `text`
-- `queries`: `_id`, `text`
-- `qrels`: `query-id`, `corpus-id`, `score`
-- `bm25`: `query-id`, `corpus-ids` (A bm25 subset is included for first-stage retrieval and reranking experiments.)
+## Source Links
 
-## BM25 baseline scores
+- Final dataset: [hakari-bench/NanoBEIR-en](https://huggingface.co/datasets/hakari-bench/NanoBEIR-en)
 
-| Scope | nDCG@10 | nDCG@100 |
-|---|---:|---:|
-| 13-split average | 0.5736 | 0.6082 |
+## Data Layout
 
-## Selected BM25 algorithm
+This dataset uses four Hugging Face Datasets configs:
 
-| Item | Value |
-|---|---|
-| Mode | `nltk_stem` |
-| Details | NLTK snowball stemming |
+- `corpus`: documents with `_id` and `text`
+- `queries`: queries with `_id` and `text`
+- `qrels`: positive relevance labels with `query-id` and `corpus-id`
+- `bm25`: BM25 candidate lists with `query-id` and `corpus-ids`
 
-## Subset names
+Each config has the same Nano split names.
 
-- Split names: `NanoArguAna`, `NanoClimateFEVER`, `NanoDBPedia`, `NanoFEVER`, `NanoFiQA2018`, `NanoHotpotQA`, `NanoMSMARCO`, `NanoNFCorpus`, `NanoNQ`, `NanoQuoraRetrieval`, `NanoSCIDOCS`, `NanoSciFact`, `NanoTouche2020`
-- Config names in this output folder: `bm25`
+The `qrels` config is positive-only. Source rows with `score <= 0` are treated
+as non-relevant or hard-negative annotations and are not included in `qrels`.
+When the source provides such rows, their documents are preferentially used as
+hard negatives in the `corpus` config before generic corpus-fill documents.
+Source hard negatives are sampled deterministically with query round-robin so
+one query's negative pool does not dominate the corpus.
 
-## BM25 split-level baseline (`nDCG`)
+## Split Statistics
 
-| Split | nDCG@10 | nDCG@100 |
-|---|---:|---:|
-| `NanoArguAna` | 0.4276 | 0.4953 |
-| `NanoClimateFEVER` | 0.3285 | 0.3831 |
-| `NanoDBPedia` | 0.6140 | 0.6694 |
-| `NanoFEVER` | 0.8215 | 0.8336 |
-| `NanoFiQA2018` | 0.4118 | 0.4557 |
-| `NanoHotpotQA` | 0.8464 | 0.8608 |
-| `NanoMSMARCO` | 0.5404 | 0.5968 |
-| `NanoNFCorpus` | 0.3417 | 0.2454 |
-| `NanoNQ` | 0.5200 | 0.5546 |
-| `NanoQuoraRetrieval` | 0.8314 | 0.8551 |
-| `NanoSCIDOCS` | 0.3298 | 0.4416 |
-| `NanoSciFact` | 0.7359 | 0.7541 |
-| `NanoTouche2020` | 0.7082 | 0.7611 |
+Length statistics are computed with `len(str(text))` over the `queries` and
+`corpus` tables. `std` is the population standard deviation over the rows in
+each split.
 
-## Upstream source
+| Nano split | Queries | Corpus | Qrels | Query avg | Query std | Query median | Query p25 | Query p75 | Doc avg | Doc std | Doc median | Doc p25 | Doc p75 |
+|---|---:|---:|---:|---:|---:|---:|---:|---:|---:|---:|---:|---:|---:|
+| NanoArguAna | 50 | 3635 | 50 | 1201.8 | 398.7 | 1170.5 | 939.2 | 1446.5 | 1011.8 | 566.8 | 904.0 | 622.5 | 1259.0 |
+| NanoClimateFEVER | 50 | 3408 | 148 | 128.4 | 50.7 | 124.0 | 93.5 | 158.0 | 1619.5 | 888.1 | 1461.0 | 984.0 | 2079.8 |
+| NanoDBPedia | 50 | 6045 | 1158 | 33.1 | 15.0 | 33.5 | 20.0 | 45.5 | 336.3 | 141.5 | 369.0 | 237.0 | 445.0 |
+| NanoFEVER | 50 | 4996 | 57 | 45.4 | 15.9 | 43.0 | 36.0 | 53.0 | 1228.7 | 866.3 | 1041.0 | 597.8 | 1649.0 |
+| NanoFiQA2018 | 50 | 4598 | 123 | 58.5 | 19.8 | 55.0 | 44.0 | 75.2 | 899.6 | 863.5 | 651.0 | 353.0 | 1136.8 |
+| NanoHotpotQA | 50 | 5090 | 100 | 88.3 | 33.0 | 82.5 | 64.0 | 107.0 | 349.6 | 250.5 | 299.0 | 154.0 | 479.0 |
+| NanoMSMARCO | 50 | 5043 | 50 | 32.2 | 15.1 | 29.0 | 24.0 | 40.0 | 330.2 | 130.1 | 298.0 | 249.0 | 380.0 |
+| NanoNFCorpus | 50 | 2953 | 1651 | 21.0 | 13.5 | 16.5 | 9.2 | 31.5 | 1512.7 | 537.1 | 1532.0 | 1214.0 | 1775.0 |
+| NanoNQ | 50 | 5035 | 57 | 47.0 | 11.2 | 42.5 | 40.0 | 53.0 | 525.6 | 432.7 | 443.0 | 178.5 | 758.0 |
+| NanoQuoraRetrieval | 50 | 5046 | 70 | 48.0 | 21.0 | 43.5 | 35.0 | 54.8 | 54.8 | 29.2 | 47.0 | 36.0 | 64.0 |
+| NanoSCIDOCS | 50 | 2210 | 244 | 72.8 | 19.2 | 71.5 | 57.8 | 81.8 | 923.6 | 721.8 | 910.5 | 577.2 | 1230.5 |
+| NanoSciFact | 50 | 2919 | 56 | 95.8 | 41.3 | 92.5 | 62.2 | 124.8 | 1431.2 | 599.4 | 1344.0 | 1042.0 | 1725.0 |
+| NanoTouche2020 | 49 | 5745 | 932 | 43.4 | 14.2 | 40.0 | 33.0 | 57.0 | 2142.6 | 2599.9 | 989.0 | 323.0 | 3032.0 |
 
-- Original dataset: [sentence-transformers/NanoBEIR-en](https://huggingface.co/datasets/sentence-transformers/NanoBEIR-en)
+## Construction Steps
+
+This dataset is constructed as follows.
+
+1. Use MNanoBEIR / NanoBEIR as the upstream benchmark or dataset family.
+2. Load source datasets from the `hakari-bench/NanoBEIR-en` corpus, queries, and qrels tables.
+3. Source evaluation split policy: the NanoBEIR split set.
+4. Create one Nano split for each selected source retrieval task.
+5. Keep up to 200 eligible queries per Nano split.
+6. Treat source relevance rows with `score > 0` as qrels-positive documents.
+   If the source has no score column, treat its qrels as positive-only only when
+   that is the source task convention.
+7. Exclude source rows with `score <= 0` from `qrels`. When such rows are
+   available for selected queries, use their documents as hard-negative corpus
+   candidates before generic fill documents.
+8. Include all qrels-positive documents for the selected queries.
+9. Use the included corpus tables for each Nano split; no additional document resampling is performed.
+10. Remove exact duplicate query text and document text within each split. If a
+   removed document duplicate was referenced by qrels,
+   the qrels row was removed.
+11. Store corpus text as `title` plus body text when available.
+12. Generate BM25 top-100 candidates with
+    `regex` tokenization.
+13. If a qrels-positive document is missing from the raw BM25 result, insert it
+    into the final `bm25` candidate list by replacing a tail non-positive
+    candidate.
+
+The `qrels` config is positive-only. When needed for top-k reranking coverage, positive qrels are capped per query to the BM25 top-k.
+
+The `bm25` candidate subset is generated from the included corpus for each split.
+
+For top-100 reranking diagnostics, positive qrels are capped to at most 100 documents per query before BM25 positive forcing. This makes full relevant coverage possible for splits whose upstream qrels contain more than 100 positives for a single query.
+
+## BM25 Subset Policy
+
+The `bm25` config is a candidate subset for first-stage retrieval and reranking.
+It is not a separate source dataset. Each row contains one query id and a ranked
+list of up to 100 corpus ids.
+
+BM25 candidates are generated from the selected corpus for each split. When a
+qrels-positive document is not present in the raw BM25 top-100
+results, the missing positive is forced into the final candidate list by
+replacing a tail candidate that is not positive for that query. Candidate ids
+are kept unique after replacement.
+
+Concretely, each `bm25` row is produced by tokenizing the selected split corpus
+and query texts with `regex`, ranking the corpus with BM25,
+then writing the ranked corpus ids as `corpus-ids` for that query. The list is a
+candidate subset for downstream evaluation, not a full-corpus ranking.
+
+Source hard negatives, including documents referenced by source rows with
+`score <= 0`, may appear in the selected corpus and can naturally appear in BM25
+candidates. They are still non-relevant and are not listed in `qrels`.
+
+When source hard negatives are available, the default corpus sampling policy is
+query round-robin: group hard negatives by selected query, preserve source
+rank/order within each query, add at most one new hard negative from each query
+per pass, remove duplicate IDs and exact duplicate text, then fill any remaining
+slots from source corpus order.
+
+## Split Mapping
+
+Each Nano split maps to one source retrieval task unless noted otherwise.
+
+| Nano split | Source task | Source dataset | Queries | Corpus | Qrels |
+|---|---|---|---:|---:|---:|
+| NanoArguAna | NanoArguAna | [hakari-bench/NanoBEIR-en](https://huggingface.co/datasets/hakari-bench/NanoBEIR-en) | 50 | 3635 | 50 |
+| NanoClimateFEVER | NanoClimateFEVER | [hakari-bench/NanoBEIR-en](https://huggingface.co/datasets/hakari-bench/NanoBEIR-en) | 50 | 3408 | 148 |
+| NanoDBPedia | NanoDBPedia | [hakari-bench/NanoBEIR-en](https://huggingface.co/datasets/hakari-bench/NanoBEIR-en) | 50 | 6045 | 1158 |
+| NanoFEVER | NanoFEVER | [hakari-bench/NanoBEIR-en](https://huggingface.co/datasets/hakari-bench/NanoBEIR-en) | 50 | 4996 | 57 |
+| NanoFiQA2018 | NanoFiQA2018 | [hakari-bench/NanoBEIR-en](https://huggingface.co/datasets/hakari-bench/NanoBEIR-en) | 50 | 4598 | 123 |
+| NanoHotpotQA | NanoHotpotQA | [hakari-bench/NanoBEIR-en](https://huggingface.co/datasets/hakari-bench/NanoBEIR-en) | 50 | 5090 | 100 |
+| NanoMSMARCO | NanoMSMARCO | [hakari-bench/NanoBEIR-en](https://huggingface.co/datasets/hakari-bench/NanoBEIR-en) | 50 | 5043 | 50 |
+| NanoNFCorpus | NanoNFCorpus | [hakari-bench/NanoBEIR-en](https://huggingface.co/datasets/hakari-bench/NanoBEIR-en) | 50 | 2953 | 1651 |
+| NanoNQ | NanoNQ | [hakari-bench/NanoBEIR-en](https://huggingface.co/datasets/hakari-bench/NanoBEIR-en) | 50 | 5035 | 57 |
+| NanoQuoraRetrieval | NanoQuoraRetrieval | [hakari-bench/NanoBEIR-en](https://huggingface.co/datasets/hakari-bench/NanoBEIR-en) | 50 | 5046 | 70 |
+| NanoSCIDOCS | NanoSCIDOCS | [hakari-bench/NanoBEIR-en](https://huggingface.co/datasets/hakari-bench/NanoBEIR-en) | 50 | 2210 | 244 |
+| NanoSciFact | NanoSciFact | [hakari-bench/NanoBEIR-en](https://huggingface.co/datasets/hakari-bench/NanoBEIR-en) | 50 | 2919 | 56 |
+| NanoTouche2020 | NanoTouche2020 | [hakari-bench/NanoBEIR-en](https://huggingface.co/datasets/hakari-bench/NanoBEIR-en) | 49 | 5745 | 932 |
+
+## BM25 nDCG@10
+
+`nDCG@10` is computed from the included BM25 ranking against the included qrels.
+
+Coverage is measured against included qrels at the same BM25 top-k used for reranking diagnostics. The included BM25 candidate subset has 100.00% query coverage and 100.00% relevant coverage for every split.
+
+| Nano split | Tokenizer | Forced BM25 positives | Query cov | Relevant cov | BM25 nDCG@10 |
+|---|---|---:|---:|---:|---:|
+| NanoArguAna | regex | 0 | 100.00% | 100.00% | 0.4462 |
+| NanoClimateFEVER | regex | 65 | 100.00% | 100.00% | 0.3289 |
+| NanoDBPedia | regex | 398 | 100.00% | 100.00% | 0.5619 |
+| NanoFEVER | regex | 0 | 100.00% | 100.00% | 0.8141 |
+| NanoFiQA2018 | regex | 39 | 100.00% | 100.00% | 0.3583 |
+| NanoHotpotQA | regex | 5 | 100.00% | 100.00% | 0.8176 |
+| NanoMSMARCO | regex | 1 | 100.00% | 100.00% | 0.4890 |
+| NanoNFCorpus | regex | 1391 | 100.00% | 100.00% | 0.3620 |
+| NanoNQ | regex | 6 | 100.00% | 100.00% | 0.4708 |
+| NanoQuoraRetrieval | regex | 0 | 100.00% | 100.00% | 0.7864 |
+| NanoSCIDOCS | regex | 97 | 100.00% | 100.00% | 0.3360 |
+| NanoSciFact | regex | 5 | 100.00% | 100.00% | 0.7174 |
+| NanoTouche2020 | regex | 181 | 100.00% | 100.00% | 0.7072 |
+
+## Skipped Tasks
+
+No source tasks were skipped.
 
 ## License
 
-Same as the upstream dataset. Follow upstream licensing and attribution requirements.
+NanoBEIR-en is a derived dataset. Users must comply with the licenses,
+terms, and attribution requirements of the upstream source datasets.

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+      "b": 0.75,
+      "show_progress": true,
+      "auto_selected": true,
+      "auto_detected_language": "en",
+      "auto_detection_language_counts": {
+        "en": 10
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+      "auto_detection_sample_size": 10
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+    "ndcg_at_10": 0.8140706481541362,
+    "candidate_coverage": {
+      "top_k": 100,
+      "query_count": 50,
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+      "covered_query_count": 50,
+      "query_coverage": 1.0,
+      "relevant_count": 57,
+      "covered_relevant_count": 57,
+      "relevant_coverage": 1.0
+    },
+    "rebuild_policy": "BM25 candidates were recomputed locally and qrels-positive documents missing from the raw top-k were forced into the final candidate list.",
+    "forced_queries": 0,
+    "forced_doc_count": 0,
+    "missing_positive_doc_count_after_forcing": 0,
+    "rebuilt_at_utc": "2026-05-19T01:30:08.805440+00:00"
+  }
+}

metadata/NanoFiQA2018.json

@@ -0,0 +1,48 @@
+{
+  "split_name": "NanoFiQA2018",
+  "queries": 50,
+  "corpus": 4571,
+  "qrels": 123,
+  "source_non_positive_qrels": 0,
+  "qrels_selection": {
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+    "removed_qrels_over_cap": 0,
+    "qrels_cap_policy": "positive qrels are capped per query to the BM25 candidate top_k"
+  },
+  "bm25": {
+    "config": {
+      "backend": "bm25s",
+      "algorithm": "okapi",
+      "source": "computed_bm25s",
+      "tokenizer": "regex",
+      "tokenizer_name": null,
+      "stemmer_algorithm": "english",
+      "top_k": 100,
+      "k1": 1.5,
+      "b": 0.75,
+      "show_progress": true,
+      "auto_selected": true,
+      "auto_detected_language": "en",
+      "auto_detection_language_counts": {
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+      "auto_detection_sample_size": 10
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+      "query_count": 50,
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+      "covered_query_count": 50,
+      "query_coverage": 1.0,
+      "relevant_count": 123,
+      "covered_relevant_count": 123,
+      "relevant_coverage": 1.0
+    },
+    "rebuild_policy": "BM25 candidates were recomputed locally and qrels-positive documents missing from the raw top-k were forced into the final candidate list.",
+    "forced_queries": 23,
+    "forced_doc_count": 39,
+    "missing_positive_doc_count_after_forcing": 0,
+    "rebuilt_at_utc": "2026-05-19T01:30:09.109158+00:00"
+  }
+}

metadata/NanoHotpotQA.json

@@ -0,0 +1,48 @@
+{
+  "split_name": "NanoHotpotQA",
+  "queries": 50,
+  "corpus": 5090,
+  "qrels": 100,
+  "source_non_positive_qrels": 0,
+  "qrels_selection": {
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+    "removed_qrels_over_cap": 0,
+    "qrels_cap_policy": "positive qrels are capped per query to the BM25 candidate top_k"
+  },
+  "bm25": {
+    "config": {
+      "backend": "bm25s",
+      "algorithm": "okapi",
+      "source": "computed_bm25s",
+      "tokenizer": "regex",
+      "tokenizer_name": null,
+      "stemmer_algorithm": "english",
+      "top_k": 100,
+      "k1": 1.5,
+      "b": 0.75,
+      "show_progress": true,
+      "auto_selected": true,
+      "auto_detected_language": "en",
+      "auto_detection_language_counts": {
+        "en": 10
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+      "auto_detection_sample_size": 10
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+      "query_count": 50,
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+      "covered_query_count": 50,
+      "query_coverage": 1.0,
+      "relevant_count": 100,
+      "covered_relevant_count": 100,
+      "relevant_coverage": 1.0
+    },
+    "rebuild_policy": "BM25 candidates were recomputed locally and qrels-positive documents missing from the raw top-k were forced into the final candidate list.",
+    "forced_queries": 5,
+    "forced_doc_count": 5,
+    "missing_positive_doc_count_after_forcing": 0,
+    "rebuilt_at_utc": "2026-05-19T01:30:09.406723+00:00"
+  }
+}

metadata/NanoMSMARCO.json

@@ -0,0 +1,48 @@
+{
+  "split_name": "NanoMSMARCO",
+  "queries": 50,
+  "corpus": 5043,
+  "qrels": 50,
+  "source_non_positive_qrels": 0,
+  "qrels_selection": {
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+    "removed_qrels_over_cap": 0,
+    "qrels_cap_policy": "positive qrels are capped per query to the BM25 candidate top_k"
+  },
+  "bm25": {
+    "config": {
+      "backend": "bm25s",
+      "algorithm": "okapi",
+      "source": "computed_bm25s",
+      "tokenizer": "regex",
+      "tokenizer_name": null,
+      "stemmer_algorithm": "english",
+      "top_k": 100,
+      "k1": 1.5,
+      "b": 0.75,
+      "show_progress": true,
+      "auto_selected": true,
+      "auto_detected_language": "en",
+      "auto_detection_language_counts": {
+        "en": 10
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+      "auto_detection_sample_size": 10
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+      "query_count": 50,
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+      "covered_query_count": 50,
+      "query_coverage": 1.0,
+      "relevant_count": 50,
+      "covered_relevant_count": 50,
+      "relevant_coverage": 1.0
+    },
+    "rebuild_policy": "BM25 candidates were recomputed locally and qrels-positive documents missing from the raw top-k were forced into the final candidate list.",
+    "forced_queries": 1,
+    "forced_doc_count": 1,
+    "missing_positive_doc_count_after_forcing": 0,
+    "rebuilt_at_utc": "2026-05-19T01:30:09.596225+00:00"
+  }
+}

metadata/NanoNFCorpus.json

@@ -0,0 +1,48 @@
+{
+  "split_name": "NanoNFCorpus",
+  "queries": 50,
+  "corpus": 2953,
+  "qrels": 1651,
+  "source_non_positive_qrels": 0,
+  "qrels_selection": {
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+    "removed_qrels_over_cap": 0,
+    "qrels_cap_policy": "positive qrels are capped per query to the BM25 candidate top_k"
+  },
+  "bm25": {
+    "config": {
+      "backend": "bm25s",
+      "algorithm": "okapi",
+      "source": "computed_bm25s",
+      "tokenizer": "regex",
+      "tokenizer_name": null,
+      "stemmer_algorithm": "english",
+      "top_k": 100,
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+      "auto_detected_language": "en",
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+      "auto_detection_sample_size": 10
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+      "query_count": 50,
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+      "query_coverage": 1.0,
+      "relevant_count": 1651,
+      "covered_relevant_count": 1651,
+      "relevant_coverage": 1.0
+    },
+    "rebuild_policy": "BM25 candidates were recomputed locally and qrels-positive documents missing from the raw top-k were forced into the final candidate list.",
+    "forced_queries": 47,
+    "forced_doc_count": 1391,
+    "missing_positive_doc_count_after_forcing": 0,
+    "rebuilt_at_utc": "2026-05-19T01:30:09.912080+00:00"
+  }
+}

metadata/NanoNQ.json

@@ -0,0 +1,48 @@
+{
+  "split_name": "NanoNQ",
+  "queries": 50,
+  "corpus": 5035,
+  "qrels": 57,
+  "source_non_positive_qrels": 0,
+  "qrels_selection": {
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+    "removed_qrels_over_cap": 0,
+    "qrels_cap_policy": "positive qrels are capped per query to the BM25 candidate top_k"
+  },
+  "bm25": {
+    "config": {
+      "backend": "bm25s",
+      "algorithm": "okapi",
+      "source": "computed_bm25s",
+      "tokenizer": "regex",
+      "tokenizer_name": null,
+      "stemmer_algorithm": "english",
+      "top_k": 100,
+      "k1": 1.5,
+      "b": 0.75,
+      "show_progress": true,
+      "auto_selected": true,
+      "auto_detected_language": "en",
+      "auto_detection_language_counts": {
+        "en": 10
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+      "auto_detection_sample_size": 10
+    },
+    "ndcg_at_10": 0.47077321198619015,
+    "candidate_coverage": {
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+      "query_count": 50,
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+      "covered_query_count": 50,
+      "query_coverage": 1.0,
+      "relevant_count": 57,
+      "covered_relevant_count": 57,
+      "relevant_coverage": 1.0
+    },
+    "rebuild_policy": "BM25 candidates were recomputed locally and qrels-positive documents missing from the raw top-k were forced into the final candidate list.",
+    "forced_queries": 6,
+    "forced_doc_count": 6,
+    "missing_positive_doc_count_after_forcing": 0,
+    "rebuilt_at_utc": "2026-05-19T01:30:10.142078+00:00"
+  }
+}