/* 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. */

#include "paddle/fluid/framework/op_registry.h"
#include "paddle/fluid/operators/mlu/mlu_baseop.h"
#include "paddle/fluid/operators/utils.h"
#include "paddle/fluid/platform/device/device_wrapper.h"
#include "paddle/fluid/platform/device/xpu/xpu_header.h"
#include "paddle/fluid/platform/device_context.h"
#include "paddle/phi/kernels/funcs/math_function.h"

namespace paddle {
namespace operators {

using Tensor = framework::Tensor;
using DDim = framework::DDim;
using TensorList = std::vector<framework::Tensor>;
template <typename TensorType, typename T>
void reset_parameter_vector(
    const std::vector<TensorType>& raw_params_vec,
    const int& num_layers,
    const bool& is_bidirec,
    std::vector<std::vector<std::pair<T*, size_t>>>* params_vec) {
  // the parameter raw seuquence is [FWhi, FWhh, BWhi, BWhh] * num_layers
  // + [FBhi, FBhh, BBhi, BBhh] * num_layers, we will reset the parameter to
  // ([FWhi, FWhh, FBhi, FBhh] + [BWhi, BWhh, BBhi, BBhh]) * num_layers
  const int& direction_num = is_bidirec ? 2 : 1;
  const int& layer_weight_size = 4 * direction_num;
  const int& all_weight_size = num_layers * layer_weight_size;
  const int& bias_start_idx = all_weight_size / 2;
  for (int i = 0; i < num_layers; i++) {
    params_vec->at(i).resize(layer_weight_size);
    for (int j = 0; j < layer_weight_size; j++) {
      int k = j % 4;
      const int& section = j / 4;
      int tensor_idx = i * 2 * direction_num + section * 2 + k % 2;
      if (k >= 2) {
        tensor_idx += bias_start_idx;
      }
      using remove_cv_t = typename std::remove_cv<T>::type;
      params_vec->at(i)[j] = std::make_pair(
          const_cast<T*>(
              raw_params_vec[tensor_idx]->template data<remove_cv_t>()),
          raw_params_vec[tensor_idx]->numel() * sizeof(T));
    }
  }
}

template <typename DeviceContext, typename T>
class RNNMLUKernel : public framework::OpKernel<T> {
 public:
  void Compute(const framework::ExecutionContext& ctx) const override {
    // Input
    auto& dev_ctx = GetDevCtxFromCTX(ctx);
    auto* input = ctx.Input<Tensor>("Input");
    auto pre_state = ctx.MultiInput<Tensor>("PreState");
    auto weight_list = ctx.MultiInput<framework::Tensor>("WeightList");
    bool has_seq_length = ctx.HasInput("SequenceLength");
    // Output
    auto state = ctx.MultiOutput<Tensor>("State");
    auto* output = ctx.Output<Tensor>("Out");
    auto* reserve_data = ctx.Output<Tensor>("Reserve");
    // Attributes
    const int& num_layers = ctx.Attr<int>("num_layers");
    const bool& is_bidirec = ctx.Attr<bool>("is_bidirec");
    const int& hidden_size = ctx.Attr<int>("hidden_size");
    const std::string& mode = ctx.Attr<std::string>("mode");

    const Tensor* sequence_length = nullptr;
    if (has_seq_length) {
      sequence_length = ctx.Input<Tensor>("SequenceLength");
    }

    auto init_h = pre_state[0];  // -> hx
    auto init_c = pre_state[1];  // -> cx
    auto last_h = state[0];
    auto last_c = state[1];

    // check shape
    const int in_out_dim_num = input->dims().size();
    const int& seq_len = input->dims()[0];  // time_step
    const int& batch_size = input->dims()[1];
    const int& input_dim = input->dims()[2];
    const int& direction_num = is_bidirec ? 2 : 1;
    int in_dim_arr[in_out_dim_num] = {seq_len, batch_size, input_dim};
    int out_dim_arr[in_out_dim_num] = {
        seq_len, batch_size, direction_num * hidden_size};
    int proj_size = hidden_size;

    std::vector<int> seq_len_vec(batch_size, seq_len);
    if (has_seq_length) {  // set seq_len if no padding, otherwise seq_len for
                           // each element.
      seq_len_vec = operators::GetDataFromTensor(sequence_length);
    }
    cnnlDirectionMode_t direction =
        is_bidirec ? CNNL_RNN_BIDIRECTIONAL : CNNL_RNN_UNIDIRECTIONAL;

    PADDLE_ENFORCE_EQ(
        mode,
        "LSTM",
        platform::errors::InvalidArgument(
            "MLU only support LSTM mode now, current mode is %s", mode));
    PADDLE_ENFORCE_EQ(
        num_layers,
        1,
        platform::errors::InvalidArgument(
            "MLU only support 1 num_layers, current num_layers is %s",
            num_layers));
    PADDLE_ENFORCE_EQ(
        init_h->dims()[0],
        num_layers * direction_num,
        platform::errors::InvalidArgument("The num_layers of in RNN layer must"
                                          " be the same as first dim of init "
                                          "hidden, but received num_layers:%d,"
                                          " dim:%d",
                                          num_layers,
                                          init_h->dims()[0]));

    PADDLE_ENFORCE_EQ(
        init_c->dims()[0],
        num_layers * direction_num,
        platform::errors::InvalidArgument(
            "The num_layers of in RNN layer must"
            " be the same as first dim of cell state hidden, but received"
            " num_layers:%d, dim:%d",
            num_layers,
            init_c->dims()[0]));

    // weightlist
    std::vector<std::vector<std::pair<T*, size_t>>> parameter_lists;
    parameter_lists.resize(num_layers);
    reset_parameter_vector(
        weight_list, num_layers, is_bidirec, &parameter_lists);

    // init the output and allocate the memory
    output->mutable_data<T>(ctx.GetPlace());  // -> y in cnnl
    last_h->mutable_data<T>(ctx.GetPlace());  // -> hy in cnnl
    last_c->mutable_data<T>(ctx.GetPlace());  // -> cy in cnnl

    MLUSeqDataDesc input_seq_data_desc(CNNL_SEQDATA_TNC,
                                       ToCnnlDataType(input->dtype()),
                                       in_out_dim_num,
                                       in_dim_arr,
                                       static_cast<int>(seq_len_vec.size()),
                                       seq_len_vec.data(),
                                       nullptr);
    MLUSeqDataDesc out_seq_data_desc(CNNL_SEQDATA_TNC,
                                     ToCnnlDataType(input->dtype()),
                                     in_out_dim_num,
                                     out_dim_arr,
                                     static_cast<int>(seq_len_vec.size()),
                                     seq_len_vec.data(),
                                     nullptr);
    MLUCnnlTensorDesc hx_desc(*init_h);
    MLUCnnlTensorDesc cx_desc(*init_c);

    MLURNNDesc rnn_desc(CNNL_LSTM,
                        CNNL_RNN_DOUBLE_BIAS,
                        direction,
                        CNNL_RNN_LINEAR_INPUT,
                        ToCnnlDataType(input->dtype()),
                        ToCnnlDataType(input->dtype()),
                        input_dim,
                        hidden_size,
                        /*projection*/ proj_size,
                        num_layers,
                        nullptr,
                        CNNL_RNN_PADDED_IO_DISABLED);
    rnn_desc.SetRNNMaskMode(CNNL_LSTM_MASK_ENABLED);

    // copy weight params
    size_t weightspace_size;
    framework::Tensor weightspace;
    PADDLE_ENFORCE_MLU_SUCCESS(cnnlGetRNNWeightSpaceSize(
        GetHandleFromCTX(ctx), rnn_desc.get(), &weightspace_size));

    weightspace = ctx.AllocateTmpTensor<T, DeviceContext>(
        {static_cast<int64_t>(weightspace_size)}, dev_ctx);
    void* weightspace_ptr = weightspace.mutable_data(ctx.GetPlace());
    auto w_x = parameter_lists[0][0];
    auto w_h = parameter_lists[0][1];
    auto b_x = parameter_lists[0][2];
    auto b_h = parameter_lists[0][3];
    auto actual_total_w_size =
        w_x.second + w_h.second + b_x.second + b_h.second;

    void* w_x_ptr = weightspace_ptr;
    void* w_h_ptr = static_cast<char*>(weightspace_ptr) + w_x.second;
    void* b_x_ptr =
        static_cast<char*>(weightspace_ptr) + w_x.second + w_h.second;
    void* b_h_ptr = static_cast<char*>(weightspace_ptr) + w_x.second +
                    w_h.second + b_x.second;

    memory::Copy(weightspace.place(),
                 w_x_ptr,
                 weightspace.place(),
                 w_x.first,
                 w_x.second,
                 nullptr);
    memory::Copy(weightspace.place(),
                 w_h_ptr,
                 weightspace.place(),
                 w_h.first,
                 w_h.second,
                 nullptr);
    memory::Copy(weightspace.place(),
                 b_x_ptr,
                 weightspace.place(),
                 b_x.first,
                 b_x.second,
                 nullptr);
    memory::Copy(weightspace.place(),
                 b_h_ptr,
                 weightspace.place(),
                 b_h.first,
                 b_h.second,
                 nullptr);

    if (is_bidirec) {
      auto bw_x = parameter_lists[0][4];
      auto bw_h = parameter_lists[0][5];
      auto bb_x = parameter_lists[0][6];
      auto bb_h = parameter_lists[0][7];
      void* bw_x_ptr =
          static_cast<char*>(weightspace_ptr) + actual_total_w_size;
      void* bw_h_ptr = static_cast<char*>(weightspace_ptr) +
                       actual_total_w_size + bw_x.second;
      void* bb_x_ptr = static_cast<char*>(weightspace_ptr) +
                       actual_total_w_size + bw_x.second + bw_h.second;
      void* bb_h_ptr = static_cast<char*>(weightspace_ptr) +
                       actual_total_w_size + bw_x.second + bw_h.second +
                       bb_x.second;
      actual_total_w_size +=
          bw_x.second + bw_h.second + bb_x.second + bb_h.second;

      memory::Copy(weightspace.place(),
                   bw_x_ptr,
                   weightspace.place(),
                   bw_x.first,
                   bw_x.second,
                   nullptr);
      memory::Copy(weightspace.place(),
                   bw_h_ptr,
                   weightspace.place(),
                   bw_h.first,
                   bw_h.second,
                   nullptr);
      memory::Copy(weightspace.place(),
                   bb_x_ptr,
                   weightspace.place(),
                   bb_x.first,
                   bb_x.second,
                   nullptr);
      memory::Copy(weightspace.place(),
                   bb_h_ptr,
                   weightspace.place(),
                   bb_h.first,
                   bb_h.second,
                   nullptr);
    }

    PADDLE_ENFORCE_EQ(weightspace_size,
                      actual_total_w_size,
                      platform::errors::InvalidArgument(
                          "The weightsize doesn't match"
                          " weightspace_size:%d, actual_total_w_size:%d",
                          weightspace_size,
                          actual_total_w_size));

    // get reservespace_ptr
    int gate_num = 4;
    int hidden_data_idx = (num_layers - 1);
    hidden_data_idx += (gate_num + 1) * num_layers;
    const int& block_size = direction_num * seq_len * batch_size * hidden_size;
    reserve_data->Resize({hidden_data_idx, block_size});

    reserve_data->mutable_data<T>(ctx.GetPlace());

    MLUCnnl::RNNForward(ctx,
                        rnn_desc.get(),
                        seq_len_vec.data(),
                        weightspace_ptr,
                        weightspace_size,
                        input_seq_data_desc.get(),
                        GetBasePtr(input),
                        out_seq_data_desc.get(),
                        GetBasePtr(output),
                        hx_desc.get(),
                        GetBasePtr(init_h),
                        GetBasePtr(last_h),
                        cx_desc.get(),
                        GetBasePtr(init_c),
                        GetBasePtr(last_c),
                        GetBasePtr(reserve_data));

    if (has_seq_length) {
      // if has_seq_length, do mask out the output of cnnlRNNForwardTraining
      auto masked_mode = CNNL_MASKED_FILL;
      float off_value = 0.0f;

      framework::Tensor on_value_tensor(input->dtype());
      framework::Tensor masked_tensor(framework::TransToPhiDataType(VT::INT8));
      framework::Tensor h_masked_tensor(
          framework::TransToPhiDataType(VT::INT8));
      on_value_tensor.Resize({1});
      masked_tensor.Resize({seq_len, batch_size, direction_num * hidden_size});
      h_masked_tensor.Resize(
          {seq_len, batch_size, direction_num * hidden_size});

      on_value_tensor.mutable_data<T>(ctx.GetPlace());
      masked_tensor.mutable_data<int8_t>(ctx.GetPlace());
      int8_t* h_masked_ptr =
          h_masked_tensor.mutable_data<int8_t>(platform::CPUPlace());

      for (int t = 0; t < seq_len; ++t) {
        for (int n = 0; n < batch_size; ++n) {
          for (int c = 0; c < direction_num * hidden_size; ++c) {
            auto tmp_seq_len = seq_len_vec[n];
            auto offset = t * batch_size * direction_num * hidden_size +
                          n * direction_num * hidden_size + c;
            *(h_masked_ptr + offset) = t >= tmp_seq_len ? 1 : 0;
          }
        }
      }

      framework::TensorCopy(
          h_masked_tensor, ctx.GetPlace(), dev_ctx, &masked_tensor);
      dev_ctx.Wait();

      FillMLUTensorWithHostValue(ctx, off_value, &on_value_tensor);
      MLUCnnlTensorDesc on_value_desc(on_value_tensor);
      MLUCnnlTensorDesc output_desc(*output);
      MLUCnnlTensorDesc masked_desc(masked_tensor);

      MLUCnnl::Mask(ctx,
                    masked_mode,
                    output_desc.get(),
                    GetBasePtr(output),
                    masked_desc.get(),
                    GetBasePtr(&masked_tensor),
                    on_value_desc.get(),
                    GetBasePtr(&on_value_tensor),
                    output_desc.get(),
                    GetBasePtr(output),
                    nullptr);
    }
  }
};

template <typename DeviceContext, typename T>
class RNNMLUGradKernel : public framework::OpKernel<T> {
 public:
  void Compute(const framework::ExecutionContext& ctx) const override {
    auto& dev_ctx = ctx.template device_context<DeviceContext>();
    auto stream = ctx.template device_context<MLUDeviceContext>().stream();
    // get the tensor pointer for the input
    auto* input = ctx.Input<Tensor>("Input");
    auto pre_state = ctx.MultiInput<Tensor>("PreState");
    auto weight_list = ctx.MultiInput<framework::Tensor>("WeightList");
    auto* output = ctx.Input<Tensor>("Out");
    auto* reserve_data = ctx.Input<Tensor>("Reserve");
    const int& num_layers = ctx.Attr<int>("num_layers");
    const bool& is_bidirec = ctx.Attr<bool>("is_bidirec");
    const int& hidden_size = ctx.Attr<int>("hidden_size");
    const std::string& mode = ctx.Attr<std::string>("mode");

    bool has_seq_length = ctx.HasInput("SequenceLength");
    const Tensor* sequence_length = nullptr;
    if (has_seq_length) {
      sequence_length = ctx.Input<Tensor>("SequenceLength");
    }

    PADDLE_ENFORCE_EQ(
        mode,
        "LSTM",
        platform::errors::InvalidArgument(
            "XPU only support LSTM mode now, current mode is %s", mode));

    auto init_h = pre_state[0];  // -> hx
    auto init_c = pre_state[1];  // -> cx

    auto output_grad = ctx.Input<Tensor>(framework::GradVarName("Out"));
    auto state_grad = ctx.MultiInput<Tensor>(framework::GradVarName("State"));
    auto last_h_grad = state_grad[0];  // -> dhy
    auto last_c_grad = state_grad[1];  // -> dcy

    // get the tensor pointer for the output
    auto* input_grad = ctx.Output<Tensor>(framework::GradVarName("Input"));
    auto weight_grad_list = ctx.MultiOutput<framework::Tensor>(
        framework::GradVarName("WeightList"));
    auto pre_state_grad =
        ctx.MultiOutput<Tensor>(framework::GradVarName("PreState"));
    Tensor* init_h_grad = nullptr;
    Tensor* init_c_grad = nullptr;
    if (pre_state_grad.size() > 0) {    // has gradient
      init_h_grad = pre_state_grad[0];  // -> dhx
      init_c_grad = pre_state_grad[1];  // -> dcx
    }

    // check shape
    const int in_out_dim_num = input->dims().size();
    const int& seq_len = input->dims()[0];
    const int& batch_size = input->dims()[1];
    const int& input_dim = input->dims()[2];
    const int& direction_num = is_bidirec ? 2 : 1;
    int in_dim_arr[in_out_dim_num] = {seq_len, batch_size, input_dim};
    int out_dim_arr[in_out_dim_num] = {
        seq_len, batch_size, direction_num * hidden_size};
    int proj_size = hidden_size;
    PADDLE_ENFORCE_EQ(
        num_layers,
        1,
        platform::errors::InvalidArgument(
            "MLU only support 1 num_layers, current num_layers is %s",
            num_layers));
    PADDLE_ENFORCE_EQ(
        init_h->dims()[0],
        num_layers * direction_num,
        platform::errors::InvalidArgument("The num_layers of in RNN layer must"
                                          " be the same as first dim of init"
                                          "hidden, but received num_layers:%d,"
                                          " dim:%d",
                                          num_layers,
                                          init_h->dims()[0]));
    PADDLE_ENFORCE_EQ(
        init_c->dims()[0],
        num_layers * direction_num,
        platform::errors::InvalidArgument(
            "The num_layers of in RNN layer must"
            " be the same as first dim of cell state hidden, but received"
            " num_layers:%d, dim:%d",
            num_layers,
            init_c->dims()[0]));

    std::vector<std::vector<std::pair<T*, size_t>>> parameter_lists;
    parameter_lists.resize(num_layers);
    reset_parameter_vector(
        weight_list, num_layers, is_bidirec, &parameter_lists);

    for (unsigned int i = 0; i < weight_grad_list.size(); ++i) {
      weight_grad_list[i]->mutable_data<T>(ctx.GetPlace());
    }
    std::vector<std::vector<std::pair<T*, size_t>>> parameter_lists_grad;
    parameter_lists_grad.resize(num_layers);
    reset_parameter_vector(
        weight_grad_list, num_layers, is_bidirec, &parameter_lists_grad);

    // allocate the memory and initization the input_grad
    input_grad->mutable_data<T>(input->dims(), ctx.GetPlace());
    FillMLUTensorWithHostValue(ctx, static_cast<T>(0.0), input_grad);

    Tensor a, b;
    Tensor* dynamic_grad_pre_h = &a;
    Tensor* dynamic_grad_pre_c = &b;
    if (init_h_grad) {
      init_h_grad->mutable_data<T>(last_h_grad->dims(), ctx.GetPlace());
      FillMLUTensorWithHostValue(ctx, static_cast<T>(0.0), init_h_grad);
    } else {
      dynamic_grad_pre_h->Resize(last_h_grad->dims());
      dynamic_grad_pre_h->mutable_data<T>(ctx.GetPlace());
      FillMLUTensorWithHostValue(ctx, static_cast<T>(0.0), dynamic_grad_pre_h);
      init_h_grad = dynamic_grad_pre_h;
    }
    if (init_c_grad) {
      init_c_grad->mutable_data<T>(last_c_grad->dims(), ctx.GetPlace());
    } else {
      dynamic_grad_pre_c->Resize(last_h_grad->dims());
      dynamic_grad_pre_c->mutable_data<T>(ctx.GetPlace());
      init_c_grad = dynamic_grad_pre_c;
    }

    std::vector<int> seq_len_vec(batch_size, seq_len);
    if (has_seq_length) {
      seq_len_vec = operators::GetDataFromTensor(sequence_length);
    }
    cnnlDirectionMode_t direction =
        is_bidirec ? CNNL_RNN_BIDIRECTIONAL : CNNL_RNN_UNIDIRECTIONAL;

    MLUSeqDataDesc input_seq_data_desc(CNNL_SEQDATA_TNC,
                                       ToCnnlDataType(input->dtype()),
                                       in_out_dim_num,
                                       in_dim_arr,
                                       static_cast<int>(seq_len_vec.size()),
                                       seq_len_vec.data(),
                                       nullptr);
    MLUSeqDataDesc out_seq_data_desc(CNNL_SEQDATA_TNC,
                                     ToCnnlDataType(input->dtype()),
                                     in_out_dim_num,
                                     out_dim_arr,
                                     static_cast<int>(seq_len_vec.size()),
                                     seq_len_vec.data(),
                                     nullptr);
    MLUCnnlTensorDesc hx_desc(*init_h);
    MLUCnnlTensorDesc cx_desc(*init_c);
    MLURNNDesc rnn_desc(CNNL_LSTM,
                        CNNL_RNN_DOUBLE_BIAS,
                        direction,
                        CNNL_RNN_LINEAR_INPUT,
                        ToCnnlDataType(input->dtype()),
                        ToCnnlDataType(input->dtype()),
                        input_dim,
                        hidden_size,
                        /*projection*/ proj_size,
                        num_layers,
                        nullptr,
                        CNNL_RNN_PADDED_IO_DISABLED);
    rnn_desc.SetRNNMaskMode(CNNL_LSTM_MASK_ENABLED);

    // copy weight
    size_t weightspace_size;
    framework::Tensor weightspace, dweightspace;
    PADDLE_ENFORCE_MLU_SUCCESS(cnnlGetRNNWeightSpaceSize(
        GetHandleFromCTX(ctx), rnn_desc.get(), &weightspace_size));

    weightspace = ctx.AllocateTmpTensor<T, DeviceContext>(
        {static_cast<int64_t>(weightspace_size)}, dev_ctx);
    dweightspace = ctx.AllocateTmpTensor<T, DeviceContext>(
        {static_cast<int64_t>(weightspace_size)}, dev_ctx);
    void* weightspace_ptr = weightspace.mutable_data(ctx.GetPlace());
    auto w_x = parameter_lists[0][0];
    auto w_h = parameter_lists[0][1];
    auto b_x = parameter_lists[0][2];
    auto b_h = parameter_lists[0][3];
    auto actual_total_w_size =
        w_x.second + w_h.second + b_x.second + b_h.second;

    void* w_x_ptr = weightspace_ptr;
    void* w_h_ptr = static_cast<char*>(weightspace_ptr) + w_x.second;
    void* b_x_ptr =
        static_cast<char*>(weightspace_ptr) + w_x.second + w_h.second;
    void* b_h_ptr = static_cast<char*>(weightspace_ptr) + w_x.second +
                    w_h.second + b_x.second;

    memory::Copy(weightspace.place(),
                 w_x_ptr,
                 weightspace.place(),
                 w_x.first,
                 w_x.second,
                 stream);
    memory::Copy(weightspace.place(),
                 w_h_ptr,
                 weightspace.place(),
                 w_h.first,
                 w_h.second,
                 stream);
    memory::Copy(weightspace.place(),
                 b_x_ptr,
                 weightspace.place(),
                 b_x.first,
                 b_x.second,
                 stream);
    memory::Copy(weightspace.place(),
                 b_h_ptr,
                 weightspace.place(),
                 b_h.first,
                 b_h.second,
                 stream);

    if (is_bidirec) {
      auto bw_x = parameter_lists[0][4];
      auto bw_h = parameter_lists[0][5];
      auto bb_x = parameter_lists[0][6];
      auto bb_h = parameter_lists[0][7];
      void* bw_x_ptr =
          static_cast<char*>(weightspace_ptr) + actual_total_w_size;
      void* bw_h_ptr = static_cast<char*>(weightspace_ptr) +
                       actual_total_w_size + bw_x.second;
      void* bb_x_ptr = static_cast<char*>(weightspace_ptr) +
                       actual_total_w_size + bw_x.second + bw_h.second;
      void* bb_h_ptr = static_cast<char*>(weightspace_ptr) +
                       actual_total_w_size + bw_x.second + bw_h.second +
                       bb_x.second;
      actual_total_w_size +=
          bw_x.second + bw_h.second + bb_x.second + bb_h.second;

      memory::Copy(weightspace.place(),
                   bw_x_ptr,
                   weightspace.place(),
                   bw_x.first,
                   bw_x.second,
                   stream);
      memory::Copy(weightspace.place(),
                   bw_h_ptr,
                   weightspace.place(),
                   bw_h.first,
                   bw_h.second,
                   stream);
      memory::Copy(weightspace.place(),
                   bb_x_ptr,
                   weightspace.place(),
                   bb_x.first,
                   bb_x.second,
                   stream);
      memory::Copy(weightspace.place(),
                   bb_h_ptr,
                   weightspace.place(),
                   bb_h.first,
                   bb_h.second,
                   stream);
    }
    dev_ctx.Wait();

    PADDLE_ENFORCE_EQ(weightspace_size,
                      actual_total_w_size,
                      platform::errors::InvalidArgument(
                          "The weightsize doesn't match"
                          " weightspace_size:%d, actual_total_w_size:%d",
                          weightspace_size,
                          actual_total_w_size));

    MLUCnnl::RNNBackward(ctx,
                         rnn_desc.get(),
                         CNNL_WGRAD_MODE_SET,
                         seq_len_vec.data(),
                         GetBasePtr(&weightspace),
                         GetBasePtr(&dweightspace),
                         weightspace.numel() * sizeof(T),
                         input_seq_data_desc.get(),
                         GetBasePtr(input),
                         GetBasePtr(input_grad),
                         out_seq_data_desc.get(),
                         GetBasePtr(output),
                         GetBasePtr(output_grad),
                         hx_desc.get(),
                         GetBasePtr(init_h),
                         GetBasePtr(last_h_grad),
                         GetBasePtr(init_h_grad),
                         cx_desc.get(),
                         GetBasePtr(init_c),
                         GetBasePtr(last_c_grad),
                         GetBasePtr(init_c_grad),
                         const_cast<void*>(GetBasePtr(reserve_data)),
                         reserve_data->numel() * sizeof(T));

    void* dweightspace_ptr = dweightspace.mutable_data(ctx.GetPlace());
    auto dw_x = parameter_lists_grad[0][0];
    auto dw_h = parameter_lists_grad[0][1];
    auto db_x = parameter_lists_grad[0][2];
    auto db_h = parameter_lists_grad[0][3];
    auto dactual_total_w_size =
        dw_x.second + dw_h.second + db_x.second + db_h.second;

    void* dw_x_ptr = dweightspace_ptr;
    void* dw_h_ptr = static_cast<char*>(dweightspace_ptr) + dw_x.second;
    void* db_x_ptr =
        static_cast<char*>(dweightspace_ptr) + dw_x.second + dw_h.second;
    void* db_h_ptr = static_cast<char*>(dweightspace_ptr) + dw_x.second +
                     dw_h.second + db_x.second;

    memory::Copy(weightspace.place(),
                 dw_x.first,
                 weightspace.place(),
                 dw_x_ptr,
                 dw_x.second,
                 stream);
    memory::Copy(weightspace.place(),
                 dw_h.first,
                 weightspace.place(),
                 dw_h_ptr,
                 dw_h.second,
                 stream);
    memory::Copy(weightspace.place(),
                 db_x.first,
                 weightspace.place(),
                 db_x_ptr,
                 db_x.second,
                 stream);
    memory::Copy(weightspace.place(),
                 db_h.first,
                 weightspace.place(),
                 db_h_ptr,
                 db_h.second,
                 stream);

    if (is_bidirec) {
      auto dbw_x = parameter_lists_grad[0][4];
      auto dbw_h = parameter_lists_grad[0][5];
      auto dbb_x = parameter_lists_grad[0][6];
      auto dbb_h = parameter_lists_grad[0][7];
      void* dbw_x_ptr =
          static_cast<char*>(dweightspace_ptr) + dactual_total_w_size;
      void* dbw_h_ptr = static_cast<char*>(dweightspace_ptr) +
                        dactual_total_w_size + dbw_x.second;
      void* dbb_x_ptr = static_cast<char*>(dweightspace_ptr) +
                        dactual_total_w_size + dbw_x.second + dbw_h.second;
      void* dbb_h_ptr = static_cast<char*>(dweightspace_ptr) +
                        dactual_total_w_size + dbw_x.second + dbw_h.second +
                        dbb_x.second;
      dactual_total_w_size +=
          dbw_x.second + dbw_h.second + dbb_x.second + dbb_h.second;

      memory::Copy(weightspace.place(),
                   dbw_x.first,
                   weightspace.place(),
                   dbw_x_ptr,
                   dbw_x.second,
                   stream);
      memory::Copy(weightspace.place(),
                   dbw_h.first,
                   weightspace.place(),
                   dbw_h_ptr,
                   dbw_h.second,
                   stream);
      memory::Copy(weightspace.place(),
                   dbb_x.first,
                   weightspace.place(),
                   dbb_x_ptr,
                   dbb_x.second,
                   stream);
      memory::Copy(weightspace.place(),
                   dbb_h.first,
                   weightspace.place(),
                   dbb_h_ptr,
                   dbb_h.second,
                   stream);
    }
    dev_ctx.Wait();

    PADDLE_ENFORCE_EQ(weightspace_size,
                      dactual_total_w_size,
                      platform::errors::InvalidArgument(
                          "The weightsize doesn't match"
                          " weightspace_size:%d, dactual_total_w_size:%d",
                          weightspace_size,
                          dactual_total_w_size));
  }
};

}  // namespace operators
}  // namespace paddle

namespace ops = paddle::operators;
REGISTER_OP_MLU_KERNEL(
    rnn, ops::RNNMLUKernel<paddle::platform::MLUDeviceContext, float>);
REGISTER_OP_MLU_KERNEL(
    rnn_grad, ops::RNNMLUGradKernel<paddle::platform::MLUDeviceContext, float>);
