Datasetpublic

agentlans/fake-wikipedia

Fake Wikipedia A synthetic and semi-synthetic dataset designed for studying hallucinations, omissions, and factual inconsistencies in language models. This dataset contains 10000 paragraphs derived from the agentlans/wikipedia-first-paragraph dataset, filtered for lengths between 1000 and 8000 characters. Using Qwen/Qwen3.5-4B, two distinct text variants were generated for each entry based solely on the article title: Fully Synthetic (fake): A completely hallucinated/made-up… See the full description on the dataset page: https://huggingface.co/datasets/agentlans/fake-wikipedia.

sourceHugging Facecc-by-4.0updated 2mo agoView on Hugging Face

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Dataset Card

Fake Wikipedia

A synthetic and semi-synthetic dataset designed for studying hallucinations, omissions, and factual inconsistencies in language models.

This dataset contains 10000 paragraphs derived from the agentlans/wikipedia-first-paragraph dataset, filtered for lengths between 1000 and 8000 characters.

Using **Qwen/Qwen3.5-4B**, two distinct text variants were generated for each entry based solely on the article title:

1.Fully Synthetic (`fake`): A completely hallucinated/made-up Wikipedia introduction generated entirely by the model.
2.Semi-Synthetic (`edited`): A stylistic rewrite of the original Wikipedia paragraph adapted to match the model's synthetic writing style.

📂 Data Fields

Column	Type	Description
`id`	`string`	Unique Wikipedia page identifier.
`url`	`string`	Direct link to the source Wikipedia article.
`title`	`string`	Title of the Wikipedia article.
`text`	`string`	The original, unaltered first paragraph from Wikipedia.
`edited`	`string`	The rewritten version of the original text matching the synthetic style.
`fake`	`string`	A completely fabricated Wikipedia-style paragraph generated by the model.

💡 Example Row

json

{
  "id": "12519725",
  "url": "https://en.wikipedia.org/wiki/Esp%C3%ADritu%20Santo%20antelope%20squirrel",
  "title": "Espíritu Santo antelope squirrel",
  "text": "The Espíritu Santo antelope squirrel (Ammospermophilus insularis) is a species of antelope squirrel in the family Sciuridae...",
  "edited": "The Espíritu Santo antelope squirrel (*Ammospermophilus insularis*) is a species of squirrel in the family Sciuridae...",
  "fake": "The Espíritu Santo antelope squirrel (*Sciurus granatensis*) is a species of rodent belonging to the genus *Sciurus*..."
}

⚠️ Limitations & Biases

—Content Divergence: The original (text) and fully synthetic (fake) paragraphs are not directly parallel in content or level of detail.
—Source Quality: Wikipedia lead paragraphs vary significantly in writing style, formatting, and structural quality.
—Topic Bias: The underlying source data inherits natural Wikipedia biases regarding which subjects have extensive, detailed lead paragraphs.
—Realistic Fakes: This dataset is for studying misinformation and hallucinations, not propagating them.

Licence

Creative Commons Attribution 4.0