What initially looks like playing with hyperparameters brings new life to a somewhat older approach. From Alex's tweet:
FreezeOut: it's like layerwise pretraining for #DeepLearning hipsters who weren't around before 2009 ;-) https://t.co/q3hPVvXaa6 pic.twitter.com/t3fshovQhe— Alex J. Champandard (@alexjc) 16 juin 2017
FreezeOut: Accelerate Training by Progressively Freezing Layers by Andrew Brock, Theodore Lim, J.M. Ritchie, Nick Weston
The early layers of a deep neural net have the fewest parameters, but take up the most computation. In this extended abstract, we propose to only train the hidden layers for a set portion of the training run, freezing them out one-by-one and excluding them from the backward pass. We empirically demonstrate that FreezeOut yields savings of up to 20% wall-clock time during training with 3% loss in accuracy for DenseNets on CIFAR.
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