guard hogwild distributed spec #337
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Feature / Fix
Hogwild does not work with GPU: Hogwild is lock-free, while CUDA tensors are not necessarily so, and may result in corruption. Add guard to ensure when hogwild (distributed) is enabled, GPU is disabled in spec.
See more details from https://discuss.pytorch.org/t/mnist-hogwild-with-cuda-not-working-with-model-net-cuda/4547/2