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When to switch between Single and Multiple tree

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(a) Parameter sweep of MXNET_KVSTORE_GPUARRAY_BOUND                                      (b) 1 Push-Pull before Wait                                               (c) 150 Push-Pulls before Wait
Figure 7. VGG-16 performance as function of MXNET_KVSTORE_GPUARRAY_BOUND using batch size 4 per GPU. These figures show that beyond 1M-10M float32's, multi-tree begins to do better than a single tree.

Alternative Approaches considered

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