class

A category that a label can belong to. For example: - Correct answer: 2 - In a binary classification model that detects spam, the two classes might be spam and not spam. - In a multi-class classification model that identifies dog breeds, the classes might be poodle, beagle, pug, and so on. A classification model predicts a class. In contrast, a regression model predicts a number rather than a class. See Classification in Machine Learning Crash Course for more information.

Practitioners refer to class when building, training, or evaluating machine learning systems. It appears in research papers, product documentation, and technical discussions about AI capabilities and limitations.