text: // 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 "paddle/phi/core/dense_tensor.h"
  #include "paddle/phi/core/device_context.h"
  #include "paddle/utils/optional.h"
  
  namespace phi {
  
  template <typename T, typename Context>
  void LabelSmoothKernel(const Context& ctx,
                         const DenseTensor& label,
                         paddle::optional<const DenseTensor&> prior_dist,
                         float epsilon,
                         DenseTensor* out);
  
  }  // namespace phi
  