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diff --git a/compiler/mir-onnx-importer/ONNXHelpers.h b/compiler/mir-onnx-importer/ONNXHelpers.h
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+++ b/compiler/mir-onnx-importer/ONNXHelpers.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 __MIR_ONNX_HELPERS_H__
+#define __MIR_ONNX_HELPERS_H__
+
+#include "mir/Graph.h"
+#include "mir/ops/ConstantOp.h"
+#include "mir/TensorVariant.h"
+#include "mir/ops/TransposeOp.h"
+
+#include "onnx/onnx.pb.h"
+
+namespace mir_onnx
+{
+
+extern const int64_t firstUnknownOpset;
+
+mir::DataType onnxDataTypeToMirDataType(onnx::TensorProto::DataType type);
+
+mir::Shape constantToShape(const mir::ops::ConstantOp *op);
+
+mir::TensorVariant createTensor(const onnx::TensorProto *tensor);
+
+mir::Operation *foldConstants(mir::Graph *graph, mir::Operation *op);
+
+template <typename OpType, typename... Types>
+mir::Operation *createOp(mir::Graph *graph, Types &&... args)
+{
+  auto op = graph->create<OpType>(std::forward<Types>(args)...);
+  op = foldConstants(graph, op);
+  return op;
+}
+
+} // namespace mir_onnx
+
+#endif // __MIR_ONNX_HELPERS_H__