Math & training · Glossary term

What is Underfitting?

A model or training setup has insufficient effective capacity, optimization, features, or training signal to capture useful patterns in the training data.

What people say

“The model cannot fit the training task well enough.”

Underfitting in practice

Diagnose data and optimization first, then consider training longer, changing features, reducing excessive regularization, or increasing suitable capacity.

Learn Underfitting in the course

Lessons that name Underfitting in a title or section

  • What Is Machine Learning

    Machine learning is teaching computers to find patterns in data instead of writing rules by hand. Explain the difference between supervised, unsupervised, and reinforcement learning and identify…

    Phase 02: ML Fundamentals

Covered in Phase 02: ML Fundamentals.

  • OverfittingA generalization gap in which performance on training data is substantially better than performance on representative unseen data.
  • Loss FunctionAn objective that maps predictions and targets, sometimes with regularization terms, to a value optimization tries to reduce.
  • HyperparameterA configuration choice that shapes model structure, optimization, data processing, or inference rather than being learned as an ordinary…

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