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Essay

What is the development set used for in model building?

Question: In a machine learning project, what other name is commonly used for the development set, and what are its main purposes?

Sample answer: The development set is also called the validation set. It is used during model development to compare candidate models and guide choices such as hyperparameters, feature selection, and other design decisions before the final test set is used.

Key points:

  • Gives the alternative name: validation set.
  • Identifies its use for choosing hyperparameters.
  • Identifies its use for selecting features.
  • Notes that it helps with other model design decisions.

Rubric: Award full credit if the student states the alternative name and describes the main uses of the development set.

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Updated 2026-08-12

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