zheng-da commented on issue #9862: Fix a race condition in converting data 
layouts in MKLDNN.
URL: https://github.com/apache/incubator-mxnet/pull/9862#issuecomment-369142927
 
 
   @marcoabreu Reorder2Default and MKLDNNDataReorder shouldn't be called 
frequently. They are not in the critical path. The whole point of this PR is to 
further remove the invocation of these two methods.
   
   Creating temporary arrays isn't in the critical path either. It's used in a 
very special case: copy MKLDNN data to GPU memory.

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