cjolivier01 commented on a change in pull request #10317: [MXNET-264] Improve 
performance of MKLDNN in small batch sizes.
URL: https://github.com/apache/incubator-mxnet/pull/10317#discussion_r179326522
 
 

 ##########
 File path: src/operator/nn/mkldnn/mkldnn_base-inl.h
 ##########
 @@ -334,11 +334,104 @@ const mkldnn::memory *GetWeights(const NDArray &arr,
                                  const mkldnn::memory::primitive_desc 
&target_pd,
                                  int num_groups);
 
-mkldnn_memory_format_t GetDefaultFormat(mkldnn::memory::desc desc);
+mkldnn_memory_format_t GetDefaultFormat(const mkldnn::memory::desc &desc);
 mkldnn_memory_format_t GetDefaultFormat(int num_dims);
 mkldnn::memory::primitive_desc GetPrimitiveDesc(mkldnn::memory::primitive_desc 
pd,
                                                 mkldnn_memory_format_t format);
 
+static inline bool same_shape(const TShape &shape, const mkldnn_dims_t dims, 
int ndims) {
+  if (shape.ndim() != (size_t)ndims)
+    return false;
+  for (int i = 0; i < ndims; i++)
+    if (shape[i] != dims[i])
+      return false;
+  return true;
+}
+
+static inline bool same_shape(const TShape &shape, int dtype,
 
 Review comment:
   same here

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