/**
 * \file dnn/src/naive/layer_norm/opr_impl.h
 * MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
 *
 * Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT ARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.
 */
#pragma once
#include "megdnn/oprs.h"

namespace megdnn {
namespace naive {

class LayerNormForwardImpl final : public LayerNormForward {
public:
    using LayerNormForward::LayerNormForward;
    void exec(
            _megdnn_tensor_in data, _megdnn_tensor_in weight, _megdnn_tensor_in bias,
            _megdnn_tensor_out dst, _megdnn_tensor_out mean, _megdnn_tensor_out rstd,
            _megdnn_workspace workspace) override;
    size_t get_workspace_in_bytes(
            const TensorLayout&, const TensorLayout&, const TensorLayout&,
            const TensorLayout&, const TensorLayout&, const TensorLayout&) override {
        return 0;
    }
};

class LayerNormBackwardImpl final : public LayerNormBackward {
public:
    using LayerNormBackward::LayerNormBackward;
    void exec(
            _megdnn_tensor_in diff, _megdnn_tensor_in data, _megdnn_tensor_in weight,
            _megdnn_tensor_in mean, _megdnn_tensor_in rstd, _megdnn_tensor_out ddata,
            _megdnn_tensor_out dweight, _megdnn_tensor_out dbias,
            _megdnn_workspace workspace) override;
    size_t get_workspace_in_bytes(
            const TensorLayout&, const TensorLayout&, const TensorLayout&,
            const TensorLayout&, const TensorLayout&, const TensorLayout&,
            const TensorLayout&, const TensorLayout&) override {
        return 0;
    }
};

}  // namespace naive
}  // namespace megdnn

// vim: syntax=cpp.doxygen