The Lottery Ticket Hypothesis: Finding Sparse, Trainable Neural Networks
Neural network pruning techniques can reduce the parameter counts of trained networks by over 90%, decreasing storage requirements and improving computational performance of inference without compromising accuracy.However, contemporary experience is that the sparse architectures produced by pruning are difficult to train from the start, which would similarly improve training performance.We find that a standard pruning technique naturally uncovers subnetworks whose initializations made them capable of training effectively.Based on these results, we articulate the "lottery ticket hypothesis:" dense, randomly-initialized, feed-forward networks contain subnetworks that - when trained in isolation - reach test accuracy comparable to the original network in a similar number of iterations.The winning tickets we find have won the initialization lottery: their connections have initial weights that make training particularly effective.We present an algorithm to identify winning tickets and a series of experiments that support the lottery ticket hypothesis and the importance of these fortuitous initializations.We consistently find winning tickets that are less than 10-20% of the size of several fully-connected and convolutional feed-forward architectures for MNIST and CIFAR10.Above this size, the winning tickets that we find learn faster than the original network and reach higher test accuracy.
Feedforward neural networks that can have weights pruned after training could have had the same weights pruned before trainingShows that there exists sparse subnetworks that can be trained from scratch with good generalization performance and proposes a unpruned, randomly initialized NNs contain subnetworks that can be trained from scratch with similar generalization accuracy.The paper examines the hypothesis that randomly initialized neural networks contain sub-networks that converge equally fast or faster and can reach the same or better classification accuracy