Underfitting occurs when a model fails to capture the complexity of the training data and thus is a poor representation of the relationship between the features and the target.
Underfitting and Overfitting in Machine Learning
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What is Overfitting and Underfitting in Machine Learning?
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Overfitting and Underfitting in Machine Learning
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What Is Overfitting & Underfitting - Detect & Overcome In Python
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Underfitting in a Neural Network explained - deeplizard