orgrctera/beir_cqadupstack_wordpress

CQADupStack WordPress (BEIR) — duplicate-question retrieval

Dataset description

CQADupStack is a benchmark for community question answering (cQA) built from publicly available Stack Exchange content. It was introduced by Hoogeveen, Verspoor, and Baldwin at ADCS 2015 as a resource for studying duplicate questions: threads and posts are organized so that systems can be trained and evaluated on finding prior questions that match (or semantically duplicate) a newly asked question—central to reducing fragmentation and improving search on Q&A sites.

The original release aggregates material across twelve Stack Exchange forums. The WordPress subset corresponds to **WordPress Stack Exchange**—questions about WordPress development, themes, plugins, and site administration. Duplicate links come from the platform’s moderation workflow, with predefined splits so results stay comparable across papers.

BEIR (Benchmarking IR) repackaged CQADupStack—along with many other public corpora—as a standard retrieval benchmark for zero-shot evaluation of lexical, sparse, dense, and hybrid retrievers across heterogeneous tasks. In the BEIR formulation, CQADupStack (WordPress) is a duplicate-question retrieval setting: the “documents” are questions (or question-like posts) from the WordPress Stack Exchange corpus, and the task is to rank the true duplicate(s) for each query highly.

In upstream BEIR / ir_datasets, this slice is documented with on the order of ~49K corpus documents, 541 test queries, and 744 qrels line items (binary relevance). Full retrieval evaluation requires indexing that corpus and ranking queries against it; this Hub repository exposes the query + qrels side in Parquet form for retrieval pipelines (aligned with the BEIR test split).

Scale (this Hub snapshot)

Split	Rows
test	541

Each row is one query with relevance judgments (expected_output) pointing at corpus document identifiers.

Task: retrieval (CQADupStack WordPress)

The task is ad hoc retrieval specialized to duplicate question finding on the WordPress Stack Exchange domain:

1. Input: a natural-language question (the query)—typically about WordPress configuration, PHP hooks, themes, plugins, or the REST API.
2. Output: a ranked list of document IDs from the CQADupStack WordPress corpus (or scores over the full collection), such that relevant IDs—those marked as duplicates in the official qrels—appear at the top.

Standard IR metrics apply (e.g., nDCG@k, Recall@k, MRR), using the provided qrels as ground truth.

Note: Align expected_output document IDs with the same BEIR CQADupStack WordPress corpus you use for indexing (same ID space as the upstream BEIR release).

Data format (this repository)

Each record includes:

Field	Description
id	UUID for this example row.
input	The query text (Stack Exchange–style question).
expected_output	JSON string: list of objects {"id": "<corpus-doc-id>", "score": <relevance>}. Scores follow the BEIR qrels convention (typically 1 for relevant in binary settings). A query may have one or more relevant documents.
metadata.query_id	Original BEIR query identifier (string).
metadata.split	Split name; in this dataset, test.

Example 1 (single relevant document)

{
  "id": "141baaae-cb5d-4cde-9987-91b40dcbf9cd",
  "input": "CPT admin column auto order by date instead of title",
  "expected_output": "[{\"id\": \"81939\", \"score\": 1}]",
  "metadata.query_id": "101834",
  "metadata.split": "test"
}

Example 2 (multiple relevant documents)

{
  "id": "a51c061a-64a8-4460-9c73-3db13e5d3cd0",
  "input": "Listing pages which uses specific template",
  "expected_output": "[{\"id\": \"29918\", \"score\": 1}, {\"id\": \"130919\", \"score\": 1}]",
  "metadata.query_id": "115020",
  "metadata.split": "test"
}

References

CQADupStack (original dataset)

Doris Hoogeveen, Karin M. Verspoor, Timothy Baldwin
CQADupStack: A Benchmark Data Set for Community Question-Answering Research
Proceedings of the 20th Australasian Document Computing Symposium (ADCS 2015), Parramatta, NSW, Australia.

• DOI: 10.1145/2838931.2838934
• PDF (author page): ADCS 2015 paper
• Project page: CQADupStack resources
• Code/data mirror: CQADupStack on GitHub

The paper motivates duplicate-question tasks on real Stack Exchange communities and describes construction from a Stack Exchange data dump, including duplicate links and evaluation protocols suited to retrieval experiments.

BEIR benchmark (CQADupStack as one of 18 datasets)

Nandan Thakur, Nils Reimers, Andreas Rücklé, Abhishek Srivastava, Iryna Gurevych
BEIR: A Heterogeneous Benchmark for Zero-shot Evaluation of Information Retrieval Models
NeurIPS 2021 (Datasets and Benchmarks Track).

Abstract (from arXiv): “Existing neural information retrieval (IR) models have often been studied in homogeneous and narrow settings, which has considerably limited insights into their out-of-distribution (OOD) generalization capabilities. To address this, and to facilitate researchers to broadly evaluate the effectiveness of their models, we introduce Benchmarking-IR (BEIR), a robust and heterogeneous evaluation benchmark for information retrieval. We leverage a careful selection of 18 publicly available datasets from diverse text retrieval tasks and domains and evaluate 10 state-of-the-art retrieval systems including lexical, sparse, dense, late-interaction and re-ranking architectures on the BEIR benchmark. Our results show BM25 is a robust baseline and re-ranking and late-interaction-based models on average achieve the best zero-shot performances, however, at high computational costs. In contrast, dense and sparse-retrieval models are computationally more efficient but often underperform other approaches, highlighting the considerable room for improvement in their generalization capabilities.”

• Paper: arXiv:2104.08663 — OpenReview (NeurIPS 2021 Datasets & Benchmarks)
• Code and data: BEIR on GitHub

Related resources

• ir_datasets documents BEIR slices with corpus/query/qrel counts: beir/cqadupstack/wordpress (search for beir/cqadupstack/wordpress on the page).
• MTEB lists CQADupStack variants for embedding evaluation—useful for cross-checking task definitions: MTEB on Hugging Face.

Citation

If you use CQADupStack, cite the ADCS 2015 paper above. If you use the BEIR packaging or evaluation protocol, cite the BEIR NeurIPS 2021 paper. If you use this Parquet export, cite both the original data sources and BEIR as appropriate for your experiment.

License

Stack Exchange content is typically distributed under Creative Commons terms; BEIR and downstream cards commonly reference cc-by-sa-4.0. Verify against your corpus snapshot and upstream Stack Exchange / BEIR terms if you need strict compliance.

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Dataset card maintained for the orgrctera/beir_cqadupstack_wordpress Hub repository.