Priority-based Parameter Propagation for Distributed DNN Training
This addresses the performance limitation in distributed deep learning for practitioners, though it is an incremental optimization of existing methods.
The paper tackles the communication bottleneck in distributed DNN training by overlapping parameter synchronization with computation, resulting in throughput improvements of up to 25%, 38%, and 66% for ResNet-50, Sockeye, and VGG-19 respectively.
Data parallel training is widely used for scaling distributed deep neural network (DNN) training. However, the performance benefits are often limited by the communication-heavy parameter synchronization step. In this paper, we take advantage of the domain specific knowledge of DNN training and overlap parameter synchronization with computation in order to improve the training performance. We make two key observations: (1) the optimal data representation granularity for the communication may differ from that used by the underlying DNN model implementation and (2) different parameters can afford different synchronization delays. Based on these observations, we propose a new synchronization mechanism called Priority-based Parameter Propagation (P3). P3 synchronizes parameters at a finer granularity and schedules data transmission in such a way that the training process incurs minimal communication delay. We show that P3 can improve the training throughput of ResNet-50, Sockeye and VGG-19 by as much as 25%, 38% and 66% respectively on clusters with realistic network bandwidth