// Copyright (c) 2023 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/backends/gpu/gpu_context.h"

namespace phi {
namespace funcs {

// This functor involves a fusion calculation in Ernie or Bert.
// The fusion mode is as follows:
//
//         |    |
//         matmul
//           |
//       eltwise_add
//           |
//        softmax    /
//           \      /
//             matmul
//               |
template <typename T>
class MultiheadGPUComputeFunctor {
 public:
  void operator()(const phi::GPUContext &dev_ctx,
                  int batch,
                  int seq_len,
                  int head_num,
                  int head_size,
                  T *qkptr,
                  const T *bias_qk_ptr,
                  bool bias_is_mask,
                  T *tptr,
                  T alpha,
                  T beta);
};

}  // namespace funcs
}  // namespace phi