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diff --git a/tensorflow/contrib/tensorrt/kernels/trt_calib_op.h b/tensorflow/contrib/tensorrt/kernels/trt_calib_op.h
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+/* Copyright 2018 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_CONTRIB_TENSORRT_KERNELS_TRT_CALIB_OP_H
+#define TENSORFLOW_CONTRIB_TENSORRT_KERNELS_TRT_CALIB_OP_H
+
+#include <memory>
+#include <string>
+#include <unordered_map>
+#include <utility>
+#include <vector>
+#include "tensorflow/core/framework/op.h"
+#include "tensorflow/core/framework/op_kernel.h"
+#include "tensorflow/core/framework/tensor_shape.h"
+#include "tensorflow/core/platform/types.h"
+
+#if GOOGLE_CUDA
+#if GOOGLE_TENSORRT
+namespace tensorflow {
+namespace tensorrt {
+// TODO(sami): Convert this to async kernel!
+class TRTCalibOp : public OpKernel {
+ public:
+  explicit TRTCalibOp(OpKernelConstruction* context);
+
+  void Compute(OpKernelContext* context) override;
+
+ private:
+  string resource_name_;
+  std::vector<string> segment_nodes_;
+  std::vector<string> input_names_;
+  std::vector<tensorflow::TensorShape> shapes_;
+  std::unordered_map<string, std::pair<void*, size_t>> device_buffers_;
+  std::vector<tensorflow::PersistentTensor> dev_tensors_;
+};
+}  // namespace tensorrt
+}  // namespace tensorflow
+#endif
+#endif
+#endif  // TENSORFLOW_CONTRIB_TENSORRT_KERNELS_TRT_CALIB_OP_H