chore: import upstream snapshot with attribution

paddle/phi/kernels/impl/box_coder.h

@@ -0,0 +1,43 @@
+// Copyright (c) 2022 PaddlePaddle 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.
+
+#pragma once
+
+#include <string>
+
+#include "paddle/phi/core/enforce.h"
+
+namespace phi {
+namespace funcs {
+
+enum class BoxCodeType { kEncodeCenterSize = 0, kDecodeCenterSize = 1 };
+
+inline BoxCodeType GetBoxCodeType(const std::string &type) {
+  PADDLE_ENFORCE_EQ(
+      (type == "encode_center_size") || (type == "decode_center_size"),
+      true,
+      common::errors::InvalidArgument(
+          "The 'code_type' attribute in BoxCoder"
+          " must be 'encode_center_size' or 'decode_center_size'. "
+          "But received 'code_type' is %s",
+          type));
+  if (type == "encode_center_size") {
+    return BoxCodeType::kEncodeCenterSize;
+  } else {
+    return BoxCodeType::kDecodeCenterSize;
+  }
+}
+
+}  // namespace funcs
+}  // namespace phi