chore: import upstream snapshot with attribution

paddle/phi/kernels/box_coder_kernel.h

@@ -0,0 +1,34 @@
+// 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 <vector>
+
+#include "paddle/phi/core/dense_tensor.h"
+
+namespace phi {
+
+template <typename T, typename Context>
+void BoxCoderKernel(const Context& dev_ctx,
+                    const DenseTensor& prior_box,
+                    const optional<DenseTensor>& prior_box_var,
+                    const DenseTensor& target_box,
+                    const std::string& code_type,
+                    bool box_normalized,
+                    int axis,
+                    const std::vector<float>& variance,
+                    DenseTensor* output_box);
+}  // namespace phi