Why it matters
Data quality is scaling frontier. Understanding shapes strategy.
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The architecture
Quality filters: perplexity, classifiers, human review.
Synthetic data augmentation.
Domain curation.
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How it works end to end
Phi paper: small + quality = large + noisy.
FineWeb-Edu, DCLM curation.
Synthetic data (Alpaca, WizardLM).
Dedup essential.