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  • Choosing a Dev Set Large Enough to See Small Gains

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Validation set size for noticing a tiny accuracy change

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Updated 2026-08-12

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Gemini AI
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Google
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Machine Learning

Deep Learning

Supervised Learning

Dive into Deep Learning @ D2L

Data Science

Machine Learning Strategy

Machine Learning Yearning @ DeepLearning.AI

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  • Formal significance tests for validation-set changes

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  • What dev set size is most suitable for spotting a 0.1 percentage-point gain in accuracy?

  • A development set should always be expanded to the maximum possible size, even after it is already large enough to reveal meaningful performance changes.

  • Validation set size for noticing a tiny accuracy change

  • Match each evaluation target with the dev set size it suggests.

  • Order the steps for deciding whether a dev set is large enough to detect a useful accuracy gain.

  • Match dev-set size to the smallest gain you care about.

  • Choose a dev set size that can detect a tiny but important gain.

  • Why is a 150-example dev set not enough to tell 83.0% from 83.4% accuracy?

  • When is a validation set much larger than 10,000 examples most justified?

  • If a validation set is already large enough to tell whether one model is meaningfully better than another, it does not need to be made much larger.

  • Sizing a Training Development Set

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  • Accuracy Resolution on a 100-Example Development Set

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