// 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.

#pragma once

#include "paddle/phi/core/dense_tensor.h"
#include "paddle/utils/optional.h"

namespace phi {

template <typename T, typename Context>
void WarpctcGradKernel(const Context& dev_ctx,
                       const DenseTensor& logits,
                       const paddle::optional<DenseTensor>& logits_length,
                       const DenseTensor& warpctcgrad,
                       const DenseTensor& loss_grad,
                       int blank,
                       bool norm_by_times,
                       DenseTensor* logits_grad);

}  // namespace phi