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diff --git a/tensorflow/core/kernels/diag_op.h b/tensorflow/core/kernels/diag_op.h
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+++ b/tensorflow/core/kernels/diag_op.h
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+/* Copyright 2017 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.
+==============================================================================*/
+
+#ifndef TENSORFLOW_CORE_KERNELS_DIAG_OP_H_
+#define TENSORFLOW_CORE_KERNELS_DIAG_OP_H_
+
+#include "tensorflow/core/framework/op_kernel.h"
+#include "tensorflow/core/framework/tensor_types.h"
+#include "tensorflow/core/platform/types.h"
+
+namespace tensorflow {
+
+namespace functor {
+
+template <typename Device, typename T>
+struct DiagFunctor {
+  Status operator() (OpKernelContext* context, const int64 size,
+                     const T* in, T* out);
+};
+
+template <typename Device, typename T>
+struct DiagPartFunctor {
+  Status operator() (OpKernelContext* context, const int64 size,
+                     const T* in, T* out);
+};
+
+}  // namespace functor
+
+}  // namespace tensorflow
+
+#endif  // TENSORFLOW_CORE_KERNELS_DIAG_OP_H_