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FactBase-DCLM-contamination-report

row_index int64 2.42k 197k	matched_benchmarks stringclasses 3 values	text_excerpt stringlengths 200 200
2,415	hellaswag	simple white fading png image notre dame montreal A study of the Apostles Creed Links to sections on this page: - Why were the creeds written? - The Apostles Creed - The Nicene Creed - Are the cr
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Contamination Report — AxiomicLabs/FactBase-DCLM

What this is

A row-level audit of AxiomicLabs/FactBase-DCLM (revision cd0270572058d161f8f4798e4a8206448f0e8f0f) 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: 51 (0.026%)
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 (apache-2.0) — this report contains references to and excerpts from the source, not a redistribution of the full source data.

Citation

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

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