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Memory-Efficient Backpropagation Through Time
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Paper
Memory-Efficient Backpropagation Through Time
2016
Overview
We propose a novel approach to reduce memory consumption of the backpropagation through time (BPTT) algorithm when training recurrent neural networks (RNNs). Our approach uses dynamic programming to balance a trade-off between caching of intermediate results and recomputation. The algorithm is capable of tightly fitting within almost any user-set memory budget while finding an optimal execution policy minimizing the computational cost. Computational devices have limited memory capacity and maximizing a computational performance given a fixed memory budget is a practical use-case. We provide asymptotic computational upper bounds for various regimes. The algorithm is particularly effective for long sequences. For sequences of length 1000, our algorithm saves 95\\% of memory usage while using only one third more time per iteration than the standard BPTT.
Publisher
Cornell University Library, arXiv.org
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