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Dropout is a technique for regularizing neural networks, developed by Hinton et al. and published in the paper Improving neural networks by preventing co-adaptation of feature detectors.

The core idea behind dropout is to randomly set some of the weights in a neural network to \(0\) during the training phase.

Dropout add a hyperparameter of a “keep probability”. This is the probability that a weight value is left undisturbed– that it will not be set to \(0\).

Dropout can be considered analogous to model-averaging because the process simulates training many similar neural networks on the same data.