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Efficient Backpropagation with Variance-Controlled Adaptive Sampling
Feb. 28, 2024, 5:41 a.m. | Ziteng Wang, Jianfei Chen, Jun Zhu
cs.LG updates on arXiv.org arxiv.org
Abstract: Sampling-based algorithms, which eliminate ''unimportant'' computations during forward and/or back propagation (BP), offer potential solutions to accelerate neural network training. However, since sampling introduces approximations to training, such algorithms may not consistently maintain accuracy across various tasks. In this work, we introduce a variance-controlled adaptive sampling (VCAS) method designed to accelerate BP. VCAS computes an unbiased stochastic gradient with fine-grained layerwise importance sampling in data dimension for activation gradient calculation and leverage score sampling in …
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