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Great work, RiseML. This benchmark is sincerely appreciated.

I wonder whether NVLink would make any difference for Resnet-50. Does anyone know whether these implementations require any inter-GPU communication?

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They don't require it but some of the ResNet-50 implementations can make use of it (e.g., the ones in the Docker containers on the Nvidia GPU Cloud). But even the ones without seem to scale to 4 GPUs pretty well. This may be a different story for 8 GPUs and larger/deeper networks, e.g., ResNet-152.

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