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diff --git a/compiler/oneco/src/Convert.cpp b/compiler/oneco/src/Convert.cpp
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+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
+ * 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.
+ */
+
+#include "Convert.h"
+
+#include <cassert>
+#include <stdexcept>
+
+namespace moco
+{
+namespace onnx
+{
+
+loco::DataType as_loco_datatype(const int32_t tensor_dtype)
+{
+  switch (tensor_dtype)
+  {
+    case 0: // UNDEFINED
+      return loco::DataType::Unknown;
+    case 1: // FLOAT
+      return loco::DataType::FLOAT32;
+    case 2: // UINT8
+      return loco::DataType::U8;
+    case 3: // INT8
+      return loco::DataType::S8;
+    case 4: // UINT16
+      return loco::DataType::U16;
+    case 5: // INT16
+      return loco::DataType::S16;
+    case 6: // INT32
+      return loco::DataType::S32;
+    case 7: // INT64
+      return loco::DataType::S64;
+    case 10: // FLOAT16
+      return loco::DataType::FLOAT16;
+    case 11: // DOUBLE
+      return loco::DataType::FLOAT64;
+    case 12: // UINT32
+      return loco::DataType::U32;
+    case 13: // UINT64
+      return loco::DataType::U64;
+
+    case 8:  // STRING
+    case 9:  // BOOL
+    case 14: // COMPLEX64
+    case 15: // COMPLEX128
+    case 16: // BFLOAT16
+    default:
+      break;
+  }
+  throw std::runtime_error{"Unsupported onnx dtype"};
+}
+
+std::string tensor_dtype_as_string(const int32_t tensor_dtype)
+{
+  switch (tensor_dtype)
+  {
+    case 0: // UNDEFINED
+      return "UNDEFINED";
+    case 1: // FLOAT
+      return "FLOAT";
+    case 2: // UINT8
+      return "UINT8";
+    case 3: // INT8
+      return "INT8";
+    case 4: // UINT16
+      return "UINT16";
+    case 5: // INT16
+      return "INT16";
+    case 6: // INT32
+      return "INT32";
+    case 7: // INT64
+      return "INT64";
+    case 8: // STRING
+      return "STRING";
+    case 9: // BOOL
+      return "BOOL";
+    case 10: // FLOAT16
+      return "FLOAT16";
+    case 11: // DOUBLE
+      return "DOUBLE";
+    case 12: // UINT32
+      return "UINT32";
+    case 13: // UINT64
+      return "UINT64";
+    case 14: // COMPLEX64
+      return "COMPLEX64";
+    case 15: // COMPLEX128
+      return "COMPLEX128";
+    case 16: // BFLOAT16
+      return "BFLOAT16";
+    default:
+      break;
+  }
+  throw std::runtime_error{"Unsupported onnx dtype"};
+}
+
+} // namespace onnx
+} // namespace moco