---
license: other
pretty_name: DR-DCI Experiment Corpora
tags:
- retrieval
- corpus
- direct-corpus-interaction
- browsecomp-plus
- wiki18
- bright
- beir
---

# DCI experiment corpora

This private dataset repository stores the corpora used by the archived
DCI experiments, together with the scripts needed to reconstruct nested
scaling variants and regenerate omitted indices.

The repository preserves the original `corpora/...` paths.

## Contents

| Path | Stored size | Files | Contents |
|---|---:|---:|---|
| `corpora/bcp_fineweb_nested_10m/` | 10.61 GiB | 104 | Canonical ordered 10M BrowseComp-Plus + FineWeb corpus. It contains 101 Zstandard-compressed JSONL shards, the source/composition manifest, per-shard line counts, and the build log. |
| `corpora/wiki18/` | 4.77 GiB | 3 | Canonical `wiki-18.jsonl.gz`, the recorded assembly sizes, and the download log. The trajectory repository contains only the requested 50-question subsets, while this is the shared retrieval corpus. |
| `corpora/public_ir/` | 0.55 GiB | 42 | Pinned BRIGHT Parquet snapshots and BEIR Arguana/SciFact corpora, queries, qrels, and source README files used by the relevance-ranking experiments. |
| `scripts/trim_nested_scaling_corpus.py` | 4 KiB | 1 | Streams the ordered 10M corpus and reconstructs the smaller nested corpus variants without requiring separately stored copies. |
| `scripts/rebuild_indices.md` | 2 KiB | 1 | Recorded commands and model settings for rebuilding Pyserini/Lucene, dense, and Wiki18 E5 indices. |

## Nested BCP + FineWeb corpus

The canonical collection contains 10,000,195 documents in this order:

1. 100,195 BrowseComp-Plus documents.
2. 9,900,000 documents from `HuggingFaceFW/fineweb`,
   `sample-10BT`, split `train`.

The stored source manifest records seed 42 and a logical shard size of
100,000. The observed nested experiment boundaries are:

| Variant | Documents |
|---|---:|
| 100K | 100,195 |
| 200K | 200,197 |
| 400K | 400,195 |
| 800K | 800,195 |
| 10M | 10,000,195 |

Reconstruct a smaller variant:

```bash
python scripts/trim_nested_scaling_corpus.py \
  --source corpora/bcp_fineweb_nested_10m/collection \
  --size 800k \
  --output /path/to/bcp800k
```

The collection shards use Zstandard level 15 with long-window mode. A
long-window decoder may be required:

```bash
zstd -d --long=31 \
  corpora/bcp_fineweb_nested_10m/collection/docs_00000.jsonl.zst
```

## Index policy

Generated FAISS, dense, Lucene, and Pyserini indices are intentionally not
stored. They can be regenerated from the canonical corpora using
`scripts/rebuild_indices.md`.

## Integrity

`file_manifest.tsv` records type, size, mtime, SHA-256, relative path, and
symlink target for every corpus and included script. `SHA256SUMS` provides a
standard checksum list:

```bash
sha256sum -c SHA256SUMS
```

The repository is private because the combined corpus contains material from
multiple upstream datasets with distinct licensing and redistribution terms.