All glossary terms
conceptsintermediate

Imbalanced Data

A dataset where classes have significantly different numbers of examples, creating training challenges.

In more detail

Imbalanced data can bias models toward majority classes. Solutions include oversampling, undersampling, class weights, SMOTE, and focal loss. Requires careful evaluation using metrics like precision, recall, and F1 rather than accuracy.

Examples

  • Medical diagnosis (disease rare)
  • Fraud detection (fraud uncommon)
  • Anomaly detection
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