//*****************************************************************************
// Copyright 2017-2020 Intel Corporation
//
// 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 "ngraph/op/op.hpp"

namespace ngraph
{
    namespace op
    {
        namespace v0
        {
            /// \brief Softmax operation.
            ///
            class NGRAPH_API Softmax : public Op
            {
            public:
                static constexpr NodeTypeInfo type_info{"Softmax", 0};
                const NodeTypeInfo& get_type_info() const override { return type_info; }
                Softmax() = default;
                /// \brief Constructs a softmax operation.
                ///
                /// \param arg Node that produces the first input tensor.<br>
                /// `[d0, ...]`
                /// \param axes The axis positions (0-based) on which to calculate the softmax.
                ///
                /// Output `[d0, ...]`
                ///
                Softmax(const Output<Node>& arg, const AxisSet& axes);
                /// \brief Constructs a softmax operation.
                ///
                /// \param arg Node that produces the first input tensor.<br>
                /// `[d0, ...]`
                /// \param axes node produces the axis positions (0-based) on which to calculate the
                /// softmax.
                ///
                /// Output `[d0, ...]`
                ///
                Softmax(const Output<Node>& arg, const Output<Node>& axes);

                void validate_and_infer_types() override;

                virtual std::shared_ptr<Node>
                    copy_with_new_args(const NodeVector& new_args) const override;

                bool are_axes_constant() const;
                const AxisSet get_axes() const;
                void set_axes(const AxisSet& axes);

            protected:
                virtual void generate_adjoints(autodiff::Adjoints& adjoints,
                                               const OutputVector& deltas) override;
            };
        }

        namespace v1
        {
            class NGRAPH_API Softmax : public Op
            {
            public:
                static constexpr NodeTypeInfo type_info{"Softmax", 1};
                const NodeTypeInfo& get_type_info() const override { return type_info; }
                Softmax()
                    : m_axis(0)
                {
                }
                /// \brief Constructs a softmax operation.
                ///
                /// \param arg Node that produces the first input tensor.<br>
                /// `[d0, ...]`
                /// \param axis The axis position (0-based) on which to calculate the softmax.
                ///
                /// Output `[d0, ...]`
                ///
                Softmax(const Output<Node>& arg, const size_t axis);

                void validate_and_infer_types() override;

                size_t get_version() const override { return 1; }
                virtual std::shared_ptr<Node>
                    copy_with_new_args(const NodeVector& new_args) const override;

                size_t get_axis() const { return m_axis; }
                void set_axis(const size_t axis) { m_axis = axis; }
            protected:
                virtual void generate_adjoints(autodiff::Adjoints& adjoints,
                                               const OutputVector& deltas) override;

            private:
                size_t m_axis;
            };
        }

        // default opset version
        using v0::Softmax;
    }
}
