// 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 "lite/kernels/cuda/conv_compute.h"
#include <vector>
#include "lite/core/op_registry.h"

namespace paddle {
namespace lite {
namespace kernels {
namespace cuda {

inline int ConvOutputSize(int input_size,
                          int filter_size,
                          int dilation,
                          int pad_left,
                          int pad_right,
                          int stride) {
  const int dkernel = dilation * (filter_size - 1) + 1;
  int output_size = (input_size + pad_left + pad_right - dkernel) / stride + 1;
  CHECK_GT_OR_FALSE(output_size, 0);

  return output_size;
}

void ConvCompute::PrepareForRun() {
  auto& param = this->Param<param_t>();
  auto& ctx = this->ctx_->template As<CUDAContext>();
  conv_impl_.reset(new lite::cuda::math::CudnnConv2D<PRECISION(kFloat)>);
  conv_impl_->init(param, &ctx);
}

void ConvCompute::Run() {
  auto& param = this->Param<param_t>();
  conv_impl_->run(param);
}

template <PrecisionType Ptype_out>
void ConvComputeInt8<Ptype_out>::PrepareForRun() {
  auto& param = this->Param<param_t>();

  const auto in_dims = param.x->dims();
  const auto filter_dims = param.filter->dims();
  std::vector<int64_t> output_shape({in_dims[0]});

  auto paddings = *param.paddings;
  auto dilations = *param.dilations;

  for (size_t i = 0; i < param.strides.size(); ++i) {
    output_shape.push_back(ConvOutputSize(in_dims[i + 1],
                                          filter_dims[i + 1],
                                          dilations[i],
                                          paddings[2 * i],
                                          paddings[2 * i + 1],
                                          param.strides[i]));
  }
  output_shape.push_back(filter_dims[0]);
  param.output->Resize(lite::DDim(output_shape));

  auto& ctx = this->ctx_->template As<CUDAContext>();
  conv_impl_.reset(new lite::cuda::math::CudnnConv2DInt8<Ptype_out>);
  conv_impl_->init(param, &ctx);
}

template <PrecisionType Ptype_out>
void ConvComputeInt8<Ptype_out>::Run() {
  auto& param = this->Param<param_t>();
  const auto in_dims = param.x->dims();
  const auto filter_dims = param.filter->dims();
  std::vector<int64_t> output_shape({in_dims[0]});
  auto paddings = *param.paddings;
  auto dilations = *param.dilations;

  for (size_t i = 0; i < param.strides.size(); ++i) {
    output_shape.push_back(ConvOutputSize(in_dims[i + 1],
                                          filter_dims[i + 1],
                                          dilations[i],
                                          paddings[2 * i],
                                          paddings[2 * i + 1],
                                          param.strides[i]));
  }
  output_shape.push_back(filter_dims[0]);
  param.output->Resize(lite::DDim(output_shape));

  conv_impl_->run(param);
}

template class ConvComputeInt8<PRECISION(kInt8)>;
template class ConvComputeInt8<PRECISION(kFloat)>;

}  // namespace cuda
}  // namespace kernels
}  // namespace lite
}  // namespace paddle

REGISTER_LITE_KERNEL(
    conv2d, kCUDA, kFloat, kNCHW, paddle::lite::kernels::cuda::ConvCompute, def)
    .BindInput("Input",
               {LiteType::GetTensorTy(TARGET(kCUDA),
                                      PRECISION(kFloat),
                                      DATALAYOUT(kNCHW))})
    .BindInput("Bias",
               {LiteType::GetTensorTy(TARGET(kCUDA), PRECISION(kFloat))})
    .BindInput("Filter",
               {LiteType::GetTensorTy(TARGET(kCUDA),
                                      PRECISION(kFloat),
                                      DATALAYOUT(kNCHW))})
    .BindOutput("Output",
                {LiteType::GetTensorTy(TARGET(kCUDA),
                                       PRECISION(kFloat),
                                       DATALAYOUT(kNCHW))})
    .Finalize();

REGISTER_LITE_KERNEL(depthwise_conv2d,
                     kCUDA,
                     kFloat,
                     kNCHW,
                     paddle::lite::kernels::cuda::ConvCompute,
                     def)
    .BindInput("Input",
               {LiteType::GetTensorTy(TARGET(kCUDA),
                                      PRECISION(kFloat),
                                      DATALAYOUT(kNCHW))})
    .BindInput("Bias",
               {LiteType::GetTensorTy(TARGET(kCUDA), PRECISION(kFloat))})
    .BindInput("Filter",
               {LiteType::GetTensorTy(TARGET(kCUDA),
                                      PRECISION(kFloat),
                                      DATALAYOUT(kNCHW))})
    .BindOutput("Output",
                {LiteType::GetTensorTy(TARGET(kCUDA),
                                       PRECISION(kFloat),
                                       DATALAYOUT(kNCHW))})
    .Finalize();

REGISTER_LITE_KERNEL(
    conv2d,
    kCUDA,
    kInt8,
    kNHWC,
    paddle::lite::kernels::cuda::ConvComputeInt8<PRECISION(kFloat)>,
    fp32_out)
    .BindInput("Input",
               {LiteType::GetTensorTy(TARGET(kCUDA),
                                      PRECISION(kInt8),
                                      DATALAYOUT(kNHWC))})
    .BindInput("Bias",
               {LiteType::GetTensorTy(TARGET(kCUDA), PRECISION(kFloat))})
    .BindInput("Filter",
               {LiteType::GetTensorTy(TARGET(kCUDA),
                                      PRECISION(kInt8),
                                      DATALAYOUT(kNHWC))})
    .BindOutput("Output",
                {LiteType::GetTensorTy(TARGET(kCUDA),
                                       PRECISION(kFloat),
                                       DATALAYOUT(kNHWC))})
    .Finalize();

REGISTER_LITE_KERNEL(
    conv2d,
    kCUDA,
    kInt8,
    kNHWC,
    paddle::lite::kernels::cuda::ConvComputeInt8<PRECISION(kInt8)>,
    int8_out)
    .BindInput("Input",
               {LiteType::GetTensorTy(TARGET(kCUDA),
                                      PRECISION(kInt8),
                                      DATALAYOUT(kNHWC))})
    .BindInput("Bias",
               {LiteType::GetTensorTy(TARGET(kCUDA), PRECISION(kFloat))})
    .BindInput("Filter",
               {LiteType::GetTensorTy(TARGET(kCUDA),
                                      PRECISION(kInt8),
                                      DATALAYOUT(kNHWC))})
    .BindOutput("Output",
                {LiteType::GetTensorTy(TARGET(kCUDA),
                                       PRECISION(kInt8),
                                       DATALAYOUT(kNHWC))})
    .Finalize();
