implicit_regularized_solver.h

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/*
 * Copyright 2024 MusicScience37 (Kenta Kabashima)
 *
 * 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 <utility>
 
#include <Eigen/Core>
 
#include "num_collect/base/concepts/decayed_to.h"
#include "num_collect/base/concepts/dense_matrix.h"
#include "num_collect/base/concepts/real_scalar.h"
#include "num_collect/base/index_type.h"
 
namespace num_collect::regularization::concepts {
 
template <typename T>
concept implicit_regularized_solver = requires() {
    typename T::scalar_type;
    requires base::concepts::real_scalar<typename T::scalar_type>;
 
    typename T::data_type;
    requires base::concepts::dense_matrix<typename T::data_type>;
 
    requires std::is_same_v<typename T::scalar_type,
        typename Eigen::NumTraits<typename T::data_type::Scalar>::Real>;
 
    requires requires(T& solver, const typename T::scalar_type& param,
        typename T::data_type& solution) { solver.solve(param, solution); };
 
    requires requires(const T& solver) {
        { solver.data_size() } -> base::concepts::decayed_to<index_type>;
    };
 
    requires requires(const T& solver) {
        {
            solver.param_search_region()
        } -> base::concepts::decayed_to<
            std::pair<typename T::scalar_type, typename T::scalar_type>>;
    };
 
    requires requires(const T& solver, const typename T::data_type& solution) {
        {
            solver.residual_norm(solution)
        } -> base::concepts::decayed_to<typename T::scalar_type>;
    };
 
    requires requires(const T& solver, const typename T::data_type& solution) {
        {
            solver.regularization_term(solution)
        } -> base::concepts::decayed_to<typename T::scalar_type>;
    };
 
    requires requires(T& solver, const typename T::data_type& data) {
        solver.change_data(data);
    };
};
 
}  // namespace num_collect::regularization::concepts