---
pretty_name: TRQA Experiments
tags:
  - retrieval
  - information-retrieval
  - faiss
  - lucene
---

# TRQA Experiments

Prebuilt retrieval indices and experiment results accompanying the
[**TRQA dataset**](https://dl.acm.org/doi/pdf/10.1145/3805712.3808629).

This repo holds only artifacts. The queries, qrels, and corpora live in
[`mahtaa/trqa`](https://huggingface.co/datasets/mahtaa/trqa).

## Repo structure

| Path | Contents | Retriever type |
|---|---|---|
| `experiment_results/` | `experiment_results.zip` — retrieval + evaluation outputs | — |
| `indices/ecommerce/` | Indices over the **synthetic e-commerce corpus** | |
|   `bm25/` | Lucene index | sparse |
|   `spladepp/` | Lucene index (SPLADE++) | learned sparse |
|   `bge/` | `bge_Flat.index` | dense (FAISS) |
|   `e5/` | `e5_Flat.index` | dense (FAISS) |
|   `contriever/` | `contriever_Flat.index` | dense (FAISS) |
| `indices/wiki/` | Indices over the **full English Wikipedia corpus** | |
|   `bm25/` | Lucene index | sparse |
|   `spladepp/` | Lucene index (SPLADE++) | learned sparse |
|   `bge/` | `bge_Flat.index` — **5 parts** | dense (FAISS) |
|   `e5/` | `e5_Flat.index` — **4 parts** | dense (FAISS) |
|   `contriever/` | `contriever_Flat.index` — **4 parts** | dense (FAISS) |
| `indices/wiki_partial/` | Indices over the **partial Wikipedia corpus** | |
|   `e5_partial/` | `e5_Flat.index` (exact / flat) | dense (FAISS) |

## Reassembling split indices

The three large Wikipedia dense indices are stored as 45 GB chunks. Concatenate
the parts in order before use:

```bash
cat bge_Flat.index.part_*        > bge_Flat.index
cat e5_Flat.index.part_*         > e5_Flat.index
cat contriever_Flat.index.part_* > contriever_Flat.index
```

`cat` with a shell glob sorts the suffixes (`part_aa`, `part_ab`, …) correctly.
All other indices are ready to use as-is.