- It does not make use of all of the training data available. For a small data set, this is not ideal.
- It also couples the two tasks of optimizing the cost function and overfitting prevention. Finding values of lambda for regularization is much harder as you have to search and try these lambda values. 


University of Michigan - Ann Arbor

Early stopping is a classic regularization technique for deep neural networks that mitigates overfitting by constraining the number of training epochs instead of directly penalizing weight values. This approach is motivated by the fact that neural networks tend to fit clean data before memorizing noisy labels; by halting training at the optimal epoch, the model avoids interpolating noise and thereby improves generalization.

Early Stopping in Deep Learning

Downsides of Early Stopping in Deep Learning

The patience criterion is a standard method for determining the stopping point during early stopping. It involves monitoring a model's validation error throughout training (typically after each epoch) and terminating the training process if the validation error fails to decrease by at least a small amount, $$\epsilon$$, for a specified continuous number of epochs.

Patience Criterion

The effectiveness of early stopping is strongly influenced by the characteristics of the training data. For realizable datasets—where classes are cleanly separable and label noise is absent (for example, perfectly clear images of cats versus dogs)—early stopping provides minimal gains in generalization. In contrast, when a dataset contains inherent ambiguity or noisy labels, early stopping becomes a critical technique to prevent overfitting.

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