message: adding comments for MKL DNN
diff: @@ -107,6 +107,16 @@ TEST(DirectSessionWithTrackingAllocTest, CostModelTest) {
  EXPECT_EQ(2, shape.dim_size());
  EXPECT_EQ(2, shape.dim(0).size());
  EXPECT_EQ(1, shape.dim(1).size());
  + // if MKL is used, it goes through additional
  + // graph rewrite pass on top of Tensorflow.
  + // In TF, every time a graph pass
  + // happens, "constant" nodes are allocated
  + // and deallocated. Each allocation calls the
  + // (FindChunkPtr of BFCAllocator),
  + // which increments the value of AllocationId.
  + // Thus AllocationId of MKL can differ with TF if
  + // someone changes the relevant codes in BFCAllocator.
  + // Currently they are the same.
  if (node->name() == y->name()) {
  EXPECT_EQ(13, cm->AllocationId(node, 0));
  } else {
  