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diff --git a/compiler/oneco/src/Onnxutil.h b/compiler/oneco/src/Onnxutil.h
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+++ b/compiler/oneco/src/Onnxutil.h
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+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd. 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 __MOCO_FRONTEND_ONNX_ONNXUTIL_H__
+#define __MOCO_FRONTEND_ONNX_ONNXUTIL_H__
+
+#include <onnx/onnx.pb.h>
+
+#include <string>
+
+namespace moco
+{
+namespace onnx
+{
+
+/**
+ * @brief If domain is empty string or onnx.ai, it is default domain
+ * @param [in] domain The name of domain
+ * @return Whether it is default domain or not
+ */
+bool is_default_domain(const std::string domain);
+
+/**
+ * @brief Get float tensor data
+ * @param [in] tensor Tensor to get float data
+ * @return Float vector which stores float tensor data
+ */
+std::vector<float> get_float_data(const ::onnx::TensorProto &tensor);
+
+} // namespace onnx
+} // namespace moco
+
+#endif // __MOCO_FRONTEND_ONNX_ONNXUTIL_H__