// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

#include "contrib_ops/rocm/bert/skip_layer_norm.h"

#include "core/providers/rocm/rocm_common.h"
#include "contrib_ops/rocm/bert/skip_layer_norm_impl.h"
#include "contrib_ops/rocm/bert/transformer_common.h"

namespace onnxruntime {
namespace contrib {
namespace rocm {

#define REGISTER_KERNEL_TYPED(T)                                  \
  ONNX_OPERATOR_TYPED_KERNEL_EX(                                  \
      SkipLayerNormalization,                                     \
      kMSDomain,                                                  \
      1,                                                          \
      T,                                                          \
      kRocmExecutionProvider,                                     \
      (*KernelDefBuilder::Create())                               \
          .TypeConstraint("T", DataTypeImpl::GetTensorType<T>()), \
      SkipLayerNorm<T>);

REGISTER_KERNEL_TYPED(float)
REGISTER_KERNEL_TYPED(MLFloat16)

using namespace ONNX_NAMESPACE;

template <typename T>
SkipLayerNorm<T>::SkipLayerNorm(const OpKernelInfo& op_kernel_info) : RocmKernel(op_kernel_info) {
  ORT_ENFORCE(op_kernel_info.GetAttr<float>("epsilon", &epsilon_).IsOK());
  ORT_ENFORCE(epsilon_ >= 0);
}

template <typename T>
Status SkipLayerNorm<T>::ComputeInternal(OpKernelContext* ctx) const {
  const Tensor* input = ctx->Input<Tensor>(0);
  const Tensor* skip = ctx->Input<Tensor>(1);
  const Tensor* gamma = ctx->Input<Tensor>(2);
  const Tensor* beta = ctx->Input<Tensor>(3);
  const Tensor* bias = ctx->Input<Tensor>(4);

  Tensor* output = ctx->Output(0, input->Shape());

  // For inferencing, we support one more optional output which is the sum
  // of the input and skip tensors
  Tensor* skip_input_bias_add_output = ctx->Output(3, input->Shape());

  if (input->Shape() != skip->Shape()) {
    return ORT_MAKE_STATUS(ONNXRUNTIME, INVALID_ARGUMENT,
                           "skip is expected to have same shape as input");
  }

  if (input->Shape().Size() == 0) {
    return Status::OK();
  }

  const auto& input_dims = input->Shape().GetDims();
  size_t input_dims_size = input_dims.size();
  if (input_dims_size != 3 && input_dims_size != 2) {
    return ORT_MAKE_STATUS(ONNXRUNTIME, INVALID_ARGUMENT,
                           "input is expected to have 3 or 2 dimensions, got ", input_dims_size);
  }

  int hidden_size = static_cast<int>(input_dims[input_dims_size - 1]);

  const auto& gamma_dims = gamma->Shape().GetDims();
  if (gamma_dims.size() != 1) {
    return ORT_MAKE_STATUS(ONNXRUNTIME, INVALID_ARGUMENT,
                           "gamma is expected to have 1 dimension, got ", gamma_dims.size());
  }
  if (gamma_dims[0] != hidden_size) {
    return ORT_MAKE_STATUS(ONNXRUNTIME, INVALID_ARGUMENT,
                           "Last dimension of gamma and input does not match");
  }

  if (nullptr != beta) {
    const auto& beta_dims = beta->Shape().GetDims();
    if (beta_dims.size() != 1) {
      return ORT_MAKE_STATUS(ONNXRUNTIME, INVALID_ARGUMENT,
                             "beta is expected to have 1 dimension, got ", beta_dims.size());
    }
    if (beta_dims[0] != hidden_size) {
      return ORT_MAKE_STATUS(ONNXRUNTIME, INVALID_ARGUMENT,
                             "Last dimension of beta and input does not match");
    }
  }

  if (nullptr != bias) {
    const auto& bias_dims = bias->Shape().GetDims();
    if (bias_dims.size() != 1) {
      return ORT_MAKE_STATUS(ONNXRUNTIME, INVALID_ARGUMENT,
                             "bias is expected to have 1 dimension, got ", bias_dims.size());
    }
    if (bias_dims[0] != hidden_size) {
      return ORT_MAKE_STATUS(ONNXRUNTIME, INVALID_ARGUMENT,
                             "Last dimension of bias and input does not match");
    }
  }

  int64_t element_count = input->Shape().Size();
  typedef typename ToHipType<T>::MappedType HipT;

  return LaunchSkipLayerNormKernel<HipT, float, HipT>(
      GetTuningContext(),
      Stream(ctx),
      reinterpret_cast<HipT*>(output->MutableData<T>()),
      skip_input_bias_add_output != nullptr ? reinterpret_cast<HipT*>(skip_input_bias_add_output->MutableData<T>()) : nullptr,
      reinterpret_cast<const HipT*>(input->Data<T>()),
      reinterpret_cast<const HipT*>(skip->Data<T>()),
      reinterpret_cast<const HipT*>(gamma->Data<T>()),
      (beta != nullptr) ? reinterpret_cast<const HipT*>(beta->Data<T>()) : nullptr,
      (bias != nullptr) ? reinterpret_cast<const HipT*>(bias->Data<T>()) : nullptr,
      epsilon_,
      hidden_size,
      static_cast<int>(element_count));
}

}  // namespace rocm
}  // namespace contrib
}  // namespace onnxruntime
