larroy commented on a change in pull request #9862: Fix a race condition in 
converting data layouts in MKLDNN.
URL: https://github.com/apache/incubator-mxnet/pull/9862#discussion_r170141588
 
 

 ##########
 File path: src/ndarray/ndarray.cc
 ##########
 @@ -1017,6 +1017,7 @@ inline void CopyFromToDnsImpl(const NDArray& from, const 
NDArray& to, RunContext
     // with Copy().
     NDArray tmp_from = from;
     if (tmp_from.IsMKLDNNData()) {
+      // TODO(zhengda) tmp_from should be cached.
 
 Review comment:
   I'm not familiar with this code. But why are all all these operations 
mutating the array in a function that is supposed to be const?

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