Fix multibatch mGPU race condition in SH backwards op#484
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Signed-off-by: Matthew Cong <mcong@nvidia.com>
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swahtz
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Looks good, thanks for catching that one!
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Follow up to #434 . In the mGPU case, different batches can be processed on different GPUs so we need
atomicAdd_systeminstead ofgpuAtomicAddakaatomicAdd.