sxjscience commented on a change in pull request #18492:
URL: https://github.com/apache/incubator-mxnet/pull/18492#discussion_r436047924



##########
File path: src/operator/nn/cudnn/cudnn_batch_norm-inl.h
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@@ -228,7 +228,7 @@ class CuDNNBatchNormOp {
         &a,
         &b,
         &a,
-        req[cudnnbatchnorm::kGamma] == kWriteTo ? &b: &b_add,
+        req[cudnnbatchnorm::kGamma] == kAddTo ? &b_add : &b,

Review comment:
       @zhreshold I believe there are some `grad_req = add` issues in BN. Would 
you know if there are cases that `gamma.grad_req = write` and `beta.grad_req = 
add`? If not, we may just raise an error in the OP if it happens.




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