2WikiMultihopQA

This repository only repackages the original 2WikiMultihopQA data so that every example follows the field layout used by HotpotQA. The content of the underlying questions, answers and contexts is unaltered. All intellectual credit for creating 2WikiMultihopQA belongs to the authors of the paper Constructing a Multi‑hop QA Dataset for Comprehensive Evaluation of Reasoning Steps (COLING 2020) and the accompanying code/data in their GitHub project https://github.com/Alab-NII/2wikimultihop.

Dataset Summary

• Name: 2WikiMultihopQA
• What’s different: only the JSON schema. Each instance now has id, question, answer, type, evidences, supporting_facts, and context keys arranged exactly like HotpotQA so that existing HotpotQA data pipelines work out‑of‑the‑box.

The dataset still contains multi‑hop question‑answer pairs with supporting evidence chains drawn from Wikipedia. There are three splits:

split	#examples
train	113,284
validation	12,981
test	12,995

Dataset Structure

Each JSON Lines file contains records like:

{
  "id": "13f5ad2c088c11ebbd6fac1f6bf848b6",
  "question": "Are director of film Move (1970 Film) and director of film Méditerranée (1963 Film) from the same country?",
  "answer": "no",
  "type": "bridge_comparison",
  "level": "unknown",
  "supporting_facts": {
    "title": ["Move (1970 film)", "Méditerranée (1963 film)", "Stuart Rosenberg", "Jean-Daniel Pollet"],
    "sent_id": [0, 0, 0, 0]
  },
  "context": {
    "title": ["Stuart Rosenberg", "Méditerranée (1963 film)", "Move (1970 film)", ...],
    "sentences": [["Stuart Rosenberg (August 11, 1927 – March 15, 2007) was an American film and television director ..."],
                   ["Méditerranée is a 1963 French experimental film directed by Jean-Daniel Pollet ..."],
                   ...]
  }
}

Field definitions

Field	Type	Description
id	string	Unique identifier (original _id).
question	string	Natural‑language question.
answer	string	Short answer span (may be "yes"/"no" for binary questions).
type	string	Original 2Wiki question type (e.g. bridge_comparison, comparison).
evidences	List[List[string]]	Structured data (subject, property, object) obtained from Wikidata.
supporting_facts.title	List[string]	Wikipedia page titles that contain evidence sentences.
supporting_facts.sent_id	List[int]	Zero‑based sentence indices within each page that support the answer.
context.title	List[string]	Titles for every paragraph provided to the model.
context.sentences	List[List[string]]	Tokenised sentences for each corresponding title.

Data Splits

The conversion keeps the same train/validation/test division as the original dataset. No documents or examples were removed or added.

Source Data

• Original repository: https://github.com/Alab-NII/2wikimultihop Contains data generation scripts, the Apache‑2.0 license and citation information.
• Paper: Ho et al., Constructing A Multi-hop QA Dataset for Comprehensive Evaluation of Reasoning Steps, COLING 2020. [ACL Anthology] – [arXiv]

No new text was crawled; every paragraph is already present in the original dataset.

License

The original 2WikiMultihopQA is released under the Apache License 2.0. This redistribution keeps the same license. See LICENSE copied verbatim from the upstream repo.

How to Use

from datasets import load_dataset

ds = load_dataset("framolfese/2WikiMultihopQA")
print(ds["train"][0]["question"])