What is a decision boundary?
The separator between classes learned by a model in a binary class or multi-class classification problems.
decision boundary explained in plain English
The separator between classes learned by a model in a binary class or multi-class classification problems. For example, in the following image representing a binary classification problem, the decision boundary is the frontier between the orange class and the blue class:
Example
Practitioners refer to decision boundary when building, training, or evaluating machine learning systems. It appears in research papers, product documentation, and technical discussions about AI capabilities and limitations.
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