/* file: multi_class_classifier_model.h */
/*******************************************************************************
* Copyright 2014 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.
*******************************************************************************/

/*
//++
//  Multiclass tcc parameter structure
//--
*/

#ifndef __MULTI_CLASS_CLASSIFIER_MODEL_H__
#define __MULTI_CLASS_CLASSIFIER_MODEL_H__

#include "services/daal_defines.h"
#include "algorithms/model.h"
#include "algorithms/classifier/classifier_model.h"
#include "algorithms/classifier/classifier_predict.h"
#include "algorithms/classifier/classifier_training_batch.h"

namespace daal
{
namespace algorithms
{
/**
 * @defgroup multi_class_classifier Multi-class Classifier
 * \copydoc daal::algorithms::multi_class_classifier
 * @ingroup classification
 * @{
 */
/**
 * \brief Contains classes for computing the results of the multi-class classifier algorithm
 */
namespace multi_class_classifier
{
/**
 * <a name="DAAL-ENUM-ALGORITHMS__MULTI_CLASS_CLASSIFIER__RESULTTOCOMPUTEID"></a>
 * Available identifiers to specify the result to compute
 */
enum ResultToComputeId
{
    computeClassLabels      = classifier::computeClassLabels, /*!< Numeric table of size n x 1 with the predicted labels >*/
    computeDecisionFunction = 0x00000032ULL /*!< Numeric table of size n x (k*(k-1)/2) with the decision function for each observation >*/
};

/**
 * \brief Contains version 1.0 of Intel(R) oneAPI Data Analytics Library interface.
 */
namespace interface2
{
/**
 * @ingroup multi_class_classifier
 * @{
 */
/**
 * <a name="DAAL-STRUCT-ALGORITHMS__MULTI_CLASS_CLASSIFIER__PARAMETERBASE"></a>
 * \brief Parameters of the multi-class classifier algorithm
 *
 * \snippet multi_class_classifier/multi_class_classifier_model.h ParameterBase source code
 */
/* [ParameterBase source code] */
struct DAAL_EXPORT ParameterBase : public daal::algorithms::classifier::Parameter
{
    ParameterBase(size_t nClasses) : daal::algorithms::classifier::Parameter(nClasses), training(), prediction() {}
    services::SharedPtr<algorithms::classifier::training::Batch> training;     /*!< Two-class classifier training stage */
    services::SharedPtr<algorithms::classifier::prediction::Batch> prediction; /*!< Two-class classifier prediction stage */
};
/* [ParameterBase source code] */

/**
 * <a name="DAAL-STRUCT-ALGORITHMS__MULTI_CLASS_CLASSIFIER__PARAMETER"></a>
 * \brief Optional multi-class classifier algorithm  parameters that are used with the MultiClassClassifierWu prediction method
 *
 * \snippet multi_class_classifier/multi_class_classifier_model.h Parameter source code
 */
/* [Parameter source code] */
struct DAAL_EXPORT Parameter : public ParameterBase
{
    Parameter(size_t nClasses, size_t maxIterations = 100, double accuracyThreshold = 1.0e-12)
        : ParameterBase(nClasses), maxIterations(maxIterations), accuracyThreshold(accuracyThreshold)
    {}

    size_t maxIterations;     /*!< Maximum number of iterations */
    double accuracyThreshold; /*!< Convergence threshold */

    services::Status check() const DAAL_C11_OVERRIDE;
};
/* [Parameter source code] */
} // namespace interface2
using interface2::ParameterBase;
using interface2::Parameter;

namespace interface1
{
/**
 * <a name="DAAL-CLASS-ALGORITHMS__MULTI_CLASS_CLASSIFIER__MODEL"></a>
 * \brief Model of the classifier trained by the multi_class_classifier::training::Batch algorithm.
 */
class DAAL_EXPORT Model : public daal::algorithms::classifier::Model
{
public:
    DECLARE_MODEL(Model, classifier::Model);

    /**
     * Constructs multi-class classifier model
     * \param[in] nFeatures Number of features in the dataset
     * \param[in] par       Parameters of the multi-class classifier algorithm
     * \DAAL_DEPRECATED_USE{ Model::create }
     */
    Model(size_t nFeatures, const interface2::ParameterBase * par);

    /**
     * Empty constructor for deserialization
     * \DAAL_DEPRECATED_USE{ Model::create }
     */
    Model();

    Model(const Model & other);
    Model & operator=(const Model & other);

    /**
     * Constructs multi-class classifier model
     * \param[in] nFeatures Number of features in the dataset
     * \param[in] par       Parameters of the multi-class classifier algorithm
     * \param[out] stat     Status of the model construction
     * \return Multi-class classifier model
     */
    static services::SharedPtr<Model> create(size_t nFeatures, const interface2::ParameterBase * par, services::Status * stat = NULL);

    virtual ~Model();

    /**
     * Returns a collection of two-class classifier models in a multi-class classifier model
     * \return  Collection of two-class classifier models
     */
    data_management::DataCollectionPtr getMultiClassClassifierModel() { return _models; }

    /**
     * Returns a pointer to the array of two-class classifier models in a multi-class classifier model
     * \return Pointer to the array of two-class classifier models
     * \DAAL_DEPRECATED_USE{ Model::getTwoClassClassifierModel }
     */
    DAAL_DEPRECATED classifier::ModelPtr * getTwoClassClassifierModels();

    /**
     * Set two-class classifier model into a multi-class classifier model
     * \param[in] idx    Index of two-class classifier model in a collection
     * \param[in] model  Two-class classifier model to add into collection
     */
    void setTwoClassClassifierModel(size_t idx, const classifier::ModelPtr & model);

    /**
     * Returns a two-class classifier model in a multi-class classifier model
     * \param[in]  idx   Index of the two-class classifier model in a multi-class classifier model
     * \return             Two-class classifier model
     */
    classifier::ModelPtr getTwoClassClassifierModel(size_t idx) const;

    /**
     * Returns a number of two-class classifiers associated with the model
     * \return        Number of two-class classifiers associated with the model
     */
    size_t getNumberOfTwoClassClassifierModels() const { return _models->size(); }

    /**
     * Retrieves the number of features in the dataset was used on the training stage
     * \return Number of features in the dataset was used on the training stage
     */
    size_t getNumberOfFeatures() const DAAL_C11_OVERRIDE { return _nFeatures; }

protected:
    size_t _nFeatures;
    data_management::DataCollectionPtr _models; /* Collection of two-class classifiers associated with the model */
    classifier::ModelPtr * _modelsArray;

    Model(size_t nFeatures, const interface2::ParameterBase * par, services::Status & st);

    template <typename Archive, bool onDeserialize>
    services::Status serialImpl(Archive * arch)
    {
        services::Status st = classifier::Model::serialImpl<Archive, onDeserialize>(arch);
        if (!st) return st;
        arch->set(_nFeatures);
        arch->setSharedPtrObj(_models);

        return st;
    }
};
typedef services::SharedPtr<Model> ModelPtr;
} // namespace interface1
using interface1::Model;
using interface1::ModelPtr;

} // namespace multi_class_classifier
/** @} */
} // namespace algorithms
} // namespace daal
#endif
