// Copyright (c) 2019 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.

#include "gtest/gtest.h"
#include "paddle/fluid/framework/op_registry.h"
#include "paddle/fluid/platform/place.h"
#include "paddle/phi/core/ddim.h"
#include "paddle/phi/core/kernel_registry.h"
#include "test/cpp/fluid/elementwise/test_elementwise_op_grad_grad.h"

USE_OP_ITSELF(elementwise_add);
PD_DECLARE_KERNEL(add_double_grad, CPU, ALL_LAYOUT);
#if defined(PADDLE_WITH_CUDA) || defined(PADDLE_WITH_HIP)
PD_DECLARE_KERNEL(add_double_grad, GPU, ALL_LAYOUT);
#endif

namespace paddle {
namespace operators {

template <typename T>
class TestElementwiseAddGradGradWithoutDDX
    : public TestElementwiseOpGradGrad<T> {
 public:
  TestElementwiseAddGradGradWithoutDDX(const platform::Place &place,
                                       const framework::DDim &dims)
      : TestElementwiseOpGradGrad<T>("elementwise_add_grad_grad",
                                     place,
                                     dims,
                                     {"Y", "DOut", "DDY"},
                                     {"DDOut"}) {}

  using TestElementwiseOpGradGrad<T>::feed_datas_;
  using TestElementwiseOpGradGrad<T>::expected_outs_;
  using TestElementwiseOpGradGrad<T>::dims_;
  void ComputeExpectedOuts() override {
    size_t numel = static_cast<size_t>(phi::product(dims_));
    std::vector<T> dy(numel);
    std::vector<T> ddout(numel);
    for (size_t i = 0; i < numel; ++i) {
      // ddOut = ddX + ddY = ddY if ddX empty
      ddout[i] = feed_datas_["DDY"][i];
    }
    expected_outs_["DDOut"] = ddout;
  }

  std::unique_ptr<framework::OperatorBase> CreateTestOp() override {
    auto op = framework::OpRegistry::CreateOp(
        this->op_type_,
        {{"Y", {"Y"}}, {"DOut", {"DOut"}}, {"DDY", {"DDY"}}},
        {{"DDOut", {"DDOut"}}},
        {{"use_mkldnn", false}, {"axis", 0}});
    return op;
  }
};

TEST(test_elementwise_add_grad_grad_without_ddx, cpu_place) {
  framework::DDim dims({32, 64});
  platform::CPUPlace p;
  TestElementwiseAddGradGradWithoutDDX<float> test(p, dims);
  ASSERT_TRUE(test.Check());
}
#if defined(PADDLE_WITH_CUDA) || defined(PADDLE_WITH_HIP)
TEST(test_elementwise_add_grad_grad_without_ddx, gpu_place) {
  framework::DDim dims({32, 64});
  platform::CUDAPlace p(0);
  TestElementwiseAddGradGradWithoutDDX<float> test(p, dims);
  ASSERT_TRUE(test.Check());
}
#endif

}  // namespace operators
}  // namespace paddle
