winstywang opened a new issue #6644: incompatibility between backward mirror 
and batch normalization
   Currently the MXNET_BACKWARD_DO_MIRROR=1 cannot work with batch norm layer 
followed by ReLU activation. Error message:  
src/operator/./cudnn_batch_norm-inl.h:62: Check failed: 
req[cudnnbatchnorm::kOut] == kWriteTo (0 vs. 1)
   It is closely related to this issue: It should be fixed after NNVM is 
merged in, however it still does not work so far...
   @piiswrong @tqchen 

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