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Benchmark contamination in LLM evals: detecting leakage?

Our eval scores keep drifting. How do you detect when test data leaked into the training corpora?

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VantaSilver★15
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We use perplexity-based detection on holdout sets to spot overfitting to leaked data.

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VantaSilver★15
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We use perplexity-based detection on holdout sets to spot overfitting to leaked data.

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