Implement BatchNormalization functions from cuDNN in juice#146

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colepoirier wants to merge 1 commit intofff-rs:masterfrom colepoirier:master

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Commits on Sep 3, 2021

wrap ffi::cudnnBatchNormalizationForwardTraining() in still unsafe ffi_batch_normalization_forward_training(), but now with a Result return type
colepoirier
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