Datasets:

liodon-ai
/

openwebtext-contamination-report

row_index int64 2.6k 196k	matched_benchmarks stringclasses 3 values	text_excerpt stringlengths 200 200
2,604	mmlu	In the aftermath of the Second World War, with much of Europe in ruins, millions of people displaced, the horrors of the Holocaust a recent memory and an uneasy peace splintering the European continen
3,077	mmlu	— “Guns Kill Civil Society,” says State Department Nominee Tuesday, June 23, 2009 Senate Majority Leader Harry Reid has scheduled a Wednesday vote on a State Department nominee who supports gun cont
8,561	mmlu	Read about any period of history and one thing you’re guaranteed to come across is bloody, gut wrenching wars. It’s one thing that we humans excel at, whatever the era and whatever the culture. Yet am
19,405	mmlu	Endymion Profile Blog Joined November 2009 United States 3670 Posts #721 wdetector 3.27 is out apparently, i've been getting banned from lobbies all day Have you considered the MMO-Champion forum? You
28,110	mmlu	Greg Woolf, Rome: An Empire’s Story (New York: Oxford University Press, 2012), 384 pp., $29.95. [amazon 019977529X full]THE ROMAN Empire casts a long shadow. It may not have been the largest empire e
54,792	mmlu	H. R. 116 To permit small business concerns operating in the United States to elect to be exempt from certain Federal rules and regulations, and for other purposes. IN THE HOUSE OF REPRESENTATIVES
60,948	mmlu	A Florida man deserved to be arrested inside the Supreme Court building last year for wearing a jacket painted with "Occupy Everything," and is lucky he was only apprehended on unlawful entry charges,
63,601	mmlu	Title VII of the Civil Rights Act of 1964 EDITOR'S NOTE: The following is the text of Title VII of the Civil Rights Act of 1964 (Pub. L. 88-352) (Title VII), as amended, as it appears in volume 42 of
65,026	mmlu	by Tom Woods In January 2011 my book Nullification became notorious when it was linked to a bill that declared Barack Obama’s health care law unconstitutional and therefore void and of no effect in t
71,592	mmlu	The NRA (National Reform Association) and the Christian Amendment The National Reform Association spearheaded an attempt to amend Christianity into the Constitution using an amazingly effective strat
79,710	mmlu	Effort sets new bar for eradicating cancer; Goal to significantly increase patient survival during the next decade Newswise — HOUSTON - The University of Texas MD Anderson Cancer Center announces the
89,222	mmlu	Like many of the three million Filipinos in the United States and millions others scattered around the world, I wake up in the morning wondering what is happening to the Philippines. Since Rodrigo Dut
91,715	mmlu	----- SELECT A PAGE - ENERGY ENHANCEMENT SITE NAVIGATION ----- ENERGY ENHANCEMENT HOME PAGE - click here! ---- ENERGY ENHANCEMENT ESSENTIAL INFORMATION ---- Energy Enhancement News and Free Gifts Ener
99,562	mmlu	This holiday season, the American Humanist Association has launched a campaign featuring ads on Washington, D.C., buses that proclaim, “Why believe in a god? Just be good for goodness’ sake.” But a 20
103,662	mmlu	A Timeline of Diplomatic Ruptures, Unannounced Invasions, Declarations of War, Armistices and Surrenders. 1939 September 1 Germany invades Poland. "For months we have been suffering under the torture
109,573	mmlu	There is a strain of libertarian contrarianism that holds that the Confederate States of America were within their “rights” to secede from the Union. Such contrarianism on this particular topic is det
118,439	mmlu	October 24, 2015 - Jefferson City, MO About a month ago we emailed an alert about the Missouri Supreme Court's systematic dismantling of Amendment 5, the gun rights amendment to the Missouri Constitut
127,571	mmlu	original source here My Favorite Quotes Celeberty atheists Famous dead non-theists The Thomas Paine Library This is a collection of some of my favorite quotes, I will be adding to it as I find more
128,001	mmlu	Posted on December 17 2012 In this post I have tried to set out my analysis of the position in European Union law if there is a vote in favour of Scottish independence in the 2014 referendum. I have
132,349	mmlu	Plot : + We shall go on to the end, we shall fight in France, we shall fight on the seas and oceans, we shall fight with growing confidence and growing strength in the air, we shall defend our Islan
135,327	mmlu	by The North Atlantic Treaty Organisation (Nato) has deployed reconnaissance aircraft to Poland and Romania “to monitor the Ukrainian crisis” in order to “intensify our ongoing assessment of the impl
141,669	mmlu	Of the 41 states in the union that have a Football Bowl Subdivision team within their borders, none have more than Texas. For 12 days, as teams nationwide dig into preseason drills, USA TODAY Sports’
145,517	mmlu	Poznan in My Pants Arsenal 1:0 Manchester City Sunday April 8th, 2012. 1. It was the Best of Teams. It was the Worst of Teams. Actually, scrap my intro. Check out the original Dickens quote instea
146,068	humaneval	"WP:RECORDS" redirects here. For WikiProject Record Charts, see WP:RECORD This is a page detailing various records of Wikipedia. Some of them may never be fully known, but it's worth listing the ones
149,931	mmlu	The Immigration Restriction Act 1901[2] was an Act of the Parliament of Australia which limited immigration to Australia and formed the basis of the White Australia policy which sought to exclude all
159,414	mmlu	1. A government which robs Peter to pay Paul can always count on the support of Paul. George Bernard Shaw Everybody’s Political What’s What (1944) Ch. 30 Link 2. America needs fewer laws, not more pr
160,645	mmlu	The Alien Enemies Act Read The Sedition Act of 1798 – Full Text The Alien Enemies Act - Full Text An Act respecting alien enemies. Alien Enemies Act Images The Alien Enemies Act An Act respectin
161,821	mmlu	Rock Springs massacre Harper's Weekly An illustration of the massacre from an 1886 issue of Location Rock Springs, Wyoming, US Date September 2, 1885 7:00 a.m. – late night (UTC-6) Attack type Mass m
172,639	mmlu	It Doesn’t Take Common Sense To Know…The United States is a Secular Country August 3, 2012 by SalPezzino First, I need to apologize for not posting for a little bit. It was the weekend and then I ha
173,958	mmlu	Donald Trump tried to reassure his millions of Twitter followers on Thursday that all is not lost. He did so by giving himself a new nickname: Mr. Brexit. Although he did not explain what parallels h
176,556	mmlu	It was a tale of two conventions: one story was told by the corporations, a different was told by the citizenry. It was the tale of two conventions: one for the economic elite and one for the common f
183,197	mmlu	The rank of five-star general is an honor bestowed upon very few. In fact, you can name them on one hand: George C. Marshall, Douglas MacArthur, Dwight D. Eisenhower, Henry “Hap” Arnold, and Omar Brad
186,935	mmlu	Since last year, Ihave been closely following the FDIC's DIF fund (Deposit Insurance Fund). Starting at $53 billion in 2008, the DIF has dwindled down to…. zero. From the estimated losses they post af
187,246	hellaswag	What a week it has been. Last week, an atheist Patheos commenter asked me if to publicly advocate for atheists to have equal rights (Lark62, you know who you are!). I expected a few naysayers, a few s
196,151	mmlu	Great October Socialist Revolution the first victorious socialist revolution in history, accomplished in 1917 by the Russian working class in alliance with the poor peasantry under the leadership of

Contamination Report — Skylion007/openwebtext

What this is

A row-level audit of Skylion007/openwebtext (revision 79d93d786212f7344586290adb811d4ae6a1762c) for exact 13-gram overlap with standard benchmark test sets (gsm8k, hellaswag, humaneval, mmlu). This is not a filtered copy of the source — it's a new artifact: a list of which rows overlap which benchmark, plus summary statistics, so anyone training on the source can decide how to handle it.

Methodology

Built a combined n-gram index (13-word, lowercased, whitespace-normalized) from the test/ validation splits of: MMLU (cais/mmlu), GSM8K (openai/gsm8k), HellaSwag (Rowan/hellaswag), HumanEval (openai/openai_humaneval).
Scanned every row of the source dataset's text field for any 13-gram appearing in that index.
A row is flagged "contaminated" if at least one 13-gram matches — this is deliberately conservative (exact match only, not fuzzy/semantic similarity), so it has effectively zero false positives but will miss paraphrased contamination.

This is the same n-gram-overlap convention used by GPT-3 (Brown et al. 2020) and RedPajama's own decontamination reports, so these numbers are comparable to other published contamination audits.

Results

Source rows scanned: 200,000
Rows flagged as contaminated: 35 (0.017%)
Benchmarks checked: gsm8k, hellaswag, humaneval, mmlu

Schema

Field	Description
`row_index`	Index into the source dataset
`matched_benchmarks`	Comma-separated list of benchmarks this row overlaps
`text_excerpt`	First 200 chars of the flagged text, for manual review

Limitations

Exact n-gram matching only — paraphrased or reworded benchmark leakage is not detected.
Only checks the four benchmarks listed above, not the full range of benchmarks a given model might be evaluated on.
A flagged row does not necessarily invalidate all of a source dataset — it identifies exactly which rows to review or exclude.

License

Inherits the source dataset's license (cc0-1.0) — this report contains references to and excerpts from the source, not a redistribution of the full source data.

Citation

@misc{liodonai_openwebtext_contamination_report,
  title        = {Contamination Report — openwebtext},
  author       = {{Liodon AI}},
  year         = {2026},
  howpublished = {\url{https://huggingface.co/datasets/liodon-ai/openwebtext-contamination-report}},
  note         = {Benchmark-contamination audit of Skylion007/openwebtext}
}

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