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Vocabulary

Understand the term. Connect the concept.

A practical dictionary of 512 AI, machine learning, mathematics, and programming terms from HerbDev’s AI Vocabulary app. Start with a definition, explore an example, then follow the concepts behind it.

Linked concepts open in a new tab. Audio reads the definition and example.

Validation Set

Data & Datasets · Level 2 of 5

Validation Set

Held-out examples used for development decisions such as model selection.

Repeated tuning on validation data can overfit those decisions.

Example

Two model configurations are compared before choosing one.

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Audio transcript

Validation Set. Held-out examples used for development decisions such as model selection. Repeated tuning on validation data can overfit those decisions. For example: Two model configurations are compared before choosing one.

Explore this concept

A useful analogy

A practice exam used to choose your study strategy.

Why it matters

This helps you prevent misleading experiments caused by data preparation and split mistakes.

Technical detail

Validation supports model selection and hyperparameter tuning. Extensive reuse can adapt development decisions to its peculiarities.

Common misconception

Validation data is not a substitute for a final untouched test set.

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Related concepts

Quick recall question

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Put the terminology into context: How AI works · Machine-native representations · All learning paths

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