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diff --git a/tensorflow/core/graph/mkl_optimizer_merge.h b/tensorflow/core/graph/mkl_optimizer_merge.h
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+/* Copyright 2015 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+// An optimization pass that performs node merging and rewrite on graph nodes
+
+#ifndef TENSORFLOW_GRAPH_MKL_OPTIMIZER_MERGE_H_
+#define TENSORFLOW_GRAPH_MKL_OPTIMIZER_MERGE_H_
+
+#ifdef INTEL_MKL
+
+#include <sys/types.h>
+#include <vector>
+#include <string>
+#include <memory>
+#include "tensorflow/core/graph/graph.h"
+#include "tensorflow/core/lib/core/status.h"
+#include "tensorflow/core/common_runtime/optimization_registry.h"
+
+namespace tensorflow {
+
+// Interface to invoke the pass for unit test
+//
+// Returns true if and only if 'g' is mutated.
+extern bool OptimizeNodeMerge(std::unique_ptr<Graph>* g);
+
+}  // namespace tensorflow
+
+#endif  // INTEL_MKL
+
+#endif  // TENSORFLOW_GRAPH_MKL_OPTIMIZER_MERGE_H_