azai91 commented on issue #10994: MKLDNN fails in the backward computation when 
forward runs with is_train=False
URL: 
https://github.com/apache/incubator-mxnet/issues/10994#issuecomment-417379102
 
 
   docs mention that this is only used for a few operators such as batch_norm 
(https://mxnet.incubator.apache.org/api/python/autograd/autograd.html#mxnet.autograd.record).
   
   I will make it fallback for MKLDNN. this is probably something that should 
be removed and can be inferred.

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