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.
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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.