CLevMarqGSO_impl.h

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2020, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */

#pragma once

namespace mrpt::graphslam::optimizers
{
template <class GRAPH_T>
CLevMarqGSO<GRAPH_T>::CLevMarqGSO()
    : m_optimization_policy(OptimizationPolicy::UseLoopClosures)

{
    this->initializeLoggers("CLevMarqGSO");
}

template <class GRAPH_T>
bool CLevMarqGSO<GRAPH_T>::updateState(
    mrpt::obs::CActionCollection::Ptr action,
    mrpt::obs::CSensoryFrame::Ptr observations,
    mrpt::obs::CObservation::Ptr observation)
{
    MRPT_START
    if (this->m_graph->nodeCount() > m_last_total_num_of_nodes)
    {
        m_last_total_num_of_nodes = this->m_graph->nodeCount();
        registered_new_node = true;

        if (m_first_time_call)
        {
            opt_params.last_pair_nodes_to_edge = this->m_graph->edges;
            m_first_time_call = true;
        }

        if (opt_params.optimization_on_second_thread)
        {
            // join the previous optimization thread
            m_thread_optimize.join();

            // optimize the graph - run on a seperate thread
            m_thread_optimize = std::thread(&CLevMarqGSO::optimizeGraph, this);
        }
        else
        {  // single threaded implementation
            bool is_full_update = this->checkForFullOptimization();
            this->_optimizeGraph(is_full_update);
        }
    }

    return true;
    MRPT_END
}

template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::initializeVisuals()
{
    MRPT_START
    ASSERTDEB_(m_has_read_config);
    parent::initializeVisuals();

    this->initGraphVisualization();
    this->initOptDistanceVisualization();

    MRPT_END
}

template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::updateVisuals()
{
    MRPT_START
    parent::updateVisuals();

    if (opt_params.optimization_distance > 0)
    {
        this->updateOptDistanceVisualization();
    }

    this->updateGraphVisualization();

    MRPT_END
}

template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::notifyOfWindowEvents(
    const std::map<std::string, bool>& events_occurred)
{
    MRPT_START
    using namespace std;
    parent::notifyOfWindowEvents(events_occurred);

    // I know the keys exists - I registered them explicitly

    // optimization_distance toggling
    if (opt_params.optimization_distance > 0)
    {
        if (events_occurred.find(opt_params.keystroke_optimization_distance)
                ->second)
        {
            this->toggleOptDistanceVisualization();
        }

        if (events_occurred.find(opt_params.keystroke_optimize_graph)->second)
        {
            this->_optimizeGraph(/*is_full_update=*/true);
        }
    }

    // graph toggling
    if (events_occurred.find(viz_params.keystroke_graph_toggle)->second)
    {
        this->toggleGraphVisualization();
    }

    // if mouse event, let the user decide about the camera
    if (events_occurred.find("mouse_clicked")->second)
    {
        MRPT_LOG_DEBUG_STREAM("Mouse was clicked. Disabling autozoom.");
        m_autozoom_active = false;
    }

    // autofit the graph once
    if (events_occurred.find(viz_params.keystroke_graph_autofit)->second)
    {
        MRPT_LOG_DEBUG_STREAM("Autofit button was pressed");
        this->fitGraphInView();
    }

    MRPT_END
}  // end of notifyOfWindowEvents

template <class GRAPH_T>
inline void CLevMarqGSO<GRAPH_T>::initGraphVisualization()
{
    MRPT_START
    ASSERTDEBMSG_(this->m_win_manager, "No CWindowManager* is given");

    if (viz_params.visualize_optimized_graph)
    {
        this->m_win_observer->registerKeystroke(
            viz_params.keystroke_graph_toggle, "Toggle Graph visualization");
        this->m_win_observer->registerKeystroke(
            viz_params.keystroke_graph_autofit, "Fit Graph in view");

        this->m_win_manager->assignTextMessageParameters(
            /* offset_y*    = */ &viz_params.offset_y_graph,
            /* text_index* = */ &viz_params.text_index_graph);
    }

    MRPT_END
}
template <class GRAPH_T>
inline void CLevMarqGSO<GRAPH_T>::updateGraphVisualization()
{
    MRPT_START
    ASSERTDEBMSG_(this->m_win_manager, "No CWindowManager* is given");
    using namespace mrpt::opengl;

    this->logFmt(
        mrpt::system::LVL_DEBUG, "In the updateGraphVisualization function");

    // update the graph (clear and rewrite..)
    COpenGLScene::Ptr& scene = this->m_win->get3DSceneAndLock();

    // remove previous graph and insert the new instance
    // TODO - make this an incremental proocecure
    CRenderizable::Ptr prev_object = scene->getByName("optimized_graph");
    bool prev_visibility = true;
    if (prev_object)
    {  // set the visibility of the graph correctly
        prev_visibility = prev_object->isVisible();
    }
    scene->removeObject(prev_object);

    // CSetOfObjects::Ptr graph_obj =
    // graph_tools::graph_visualize(*this->m_graph, viz_params.cfg);
    CSetOfObjects::Ptr graph_obj = std::make_shared<CSetOfObjects>();
    this->m_graph->getAs3DObject(graph_obj, viz_params.cfg);

    graph_obj->setName("optimized_graph");
    graph_obj->setVisibility(prev_visibility);
    scene->insert(graph_obj);
    this->m_win->unlockAccess3DScene();

    this->m_win_manager->addTextMessage(
        5, -viz_params.offset_y_graph,
        format(
            "Optimized Graph: #nodes %d",
            static_cast<int>(this->m_graph->nodeCount())),
        mrpt::img::TColorf(0.0, 0.0, 0.0),
        /* unique_index = */ viz_params.text_index_graph);

    this->m_win->forceRepaint();

    if (m_autozoom_active)
    {
        this->fitGraphInView();
    }

    MRPT_END
}

template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::toggleGraphVisualization()
{
    MRPT_START
    using namespace mrpt::opengl;

    COpenGLScene::Ptr& scene = this->m_win->get3DSceneAndLock();

    CRenderizable::Ptr graph_obj = scene->getByName("optimized_graph");
    graph_obj->setVisibility(!graph_obj->isVisible());

    this->m_win->unlockAccess3DScene();
    this->m_win->forceRepaint();

    MRPT_END
}

template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::fitGraphInView()
{
    MRPT_START
    using namespace mrpt::opengl;

    ASSERTDEBMSG_(
        this->m_win,
        "\nVisualization of data was requested but no CDisplayWindow3D pointer "
        "was given\n");

    // first fetch the graph object
    COpenGLScene::Ptr& scene = this->m_win->get3DSceneAndLock();
    CRenderizable::Ptr obj = scene->getByName("optimized_graph");
    CSetOfObjects::Ptr graph_obj =
        std::dynamic_pointer_cast<CSetOfObjects>(obj);
    this->m_win->unlockAccess3DScene();
    this->m_win->forceRepaint();

    // autofit it based on its grid
    CGridPlaneXY::Ptr obj_grid =
        graph_obj->CSetOfObjects::getByClass<CGridPlaneXY>();
    if (obj_grid)
    {
        float x_min, x_max, y_min, y_max;
        obj_grid->getPlaneLimits(x_min, x_max, y_min, y_max);
        const float z_min = obj_grid->getPlaneZcoord();
        this->m_win->setCameraPointingToPoint(
            0.5 * (x_min + x_max), 0.5 * (y_min + y_max), z_min);
        this->m_win->setCameraZoom(
            2.0f * std::max(10.0f, std::max(x_max - x_min, y_max - y_min)));
    }
    this->m_win->setCameraAzimuthDeg(60);
    this->m_win->setCameraElevationDeg(75);
    this->m_win->setCameraProjective(true);

    MRPT_END
}

template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::initOptDistanceVisualization()
{
    MRPT_START
    using namespace mrpt::opengl;

    if (opt_params.optimization_distance > 0)
    {
        this->m_win_observer->registerKeystroke(
            opt_params.keystroke_optimization_distance,
            "Toggle optimization distance on/off");

        this->m_win_observer->registerKeystroke(
            opt_params.keystroke_optimize_graph,
            "Manually trigger a full graph optimization");
    }

    pose_t p;
    CRenderizable::Ptr obj = this->initOptDistanceVisualizationInternal(p);
    pose_t initial_pose;
    obj->setPose(initial_pose);
    obj->setName("optimization_distance_obj");

    COpenGLScene::Ptr scene = this->m_win->get3DSceneAndLock();
    scene->insert(obj);
    this->m_win->unlockAccess3DScene();
    this->m_win->forceRepaint();

    // optimization distance disk - textMessage
    this->m_win_manager->assignTextMessageParameters(
        &opt_params.offset_y_optimization_distance,
        &opt_params.text_index_optimization_distance);

    this->m_win_manager->addTextMessage(
        5, -opt_params.offset_y_optimization_distance,
        "Radius for graph optimization",
        mrpt::img::TColorf(opt_params.optimization_distance_color),
        /* unique_index = */ opt_params.text_index_optimization_distance);
    MRPT_END
}

template <class GRAPH_T>
mrpt::opengl::CRenderizable::Ptr
    CLevMarqGSO<GRAPH_T>::initOptDistanceVisualizationInternal(
        const mrpt::poses::CPose2D& p_unused)
{
    using namespace mrpt::opengl;

    CDisk::Ptr obj = std::make_shared<CDisk>();
    obj->setDiskRadius(
        opt_params.optimization_distance,
        opt_params.optimization_distance - 0.1);
    obj->setColor_u8(opt_params.optimization_distance_color);

    return obj;
}
template <class GRAPH_T>
mrpt::opengl::CRenderizable::Ptr
    CLevMarqGSO<GRAPH_T>::initOptDistanceVisualizationInternal(
        const mrpt::poses::CPose3D& p_unused)
{
    using namespace mrpt::opengl;

    CSphere::Ptr obj = std::make_shared<CSphere>();
    obj->setRadius(opt_params.optimization_distance);
    obj->setColor_u8(
        opt_params.optimization_distance_color.R,
        opt_params.optimization_distance_color.G,
        opt_params.optimization_distance_color.B,
        /*alpha = */ 60);

    return obj;
}

template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::updateOptDistanceVisualization()
{
    MRPT_START
    ASSERTDEBMSG_(this->m_win_manager, "No CWindowManager* is given");
    using namespace mrpt::opengl;

    // update ICP_max_distance Disk
    COpenGLScene::Ptr scene = this->m_win->get3DSceneAndLock();

    CRenderizable::Ptr obj = scene->getByName("optimization_distance_obj");
    obj->setPose(this->m_graph->nodes.rbegin()->second);

    this->m_win->unlockAccess3DScene();
    this->m_win->forceRepaint();
    MRPT_END
}

// TODO - implement this
template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::toggleOptDistanceVisualization()
{
    MRPT_START
    using namespace mrpt::opengl;

    COpenGLScene::Ptr scene = this->m_win->get3DSceneAndLock();

    CRenderizable::Ptr obj = scene->getByName("optimization_distance_obj");
    obj->setVisibility(!obj->isVisible());

    this->m_win->unlockAccess3DScene();
    this->m_win->forceRepaint();

    MRPT_END
}

template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::optimizeGraph()
{
    MRPT_START
    using namespace std;

    MRPT_LOG_DEBUG_STREAM(
        "optimizeGraph:: ThreadID:" << endl
                                    << "\t" << std::this_thread::get_id()
                                    << endl
                                    << "\t"
                                    << "Trying to grab lock... ");

    std::lock_guard<std::mutex> graph_lock(*this->m_graph_section);
    this->_optimizeGraph();

    this->logFmt(mrpt::system::LVL_DEBUG, "2nd thread grabbed the lock..");

    MRPT_END
}

template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::_optimizeGraph(bool is_full_update /*=false*/)
{
    MRPT_START
    this->m_time_logger.enter("CLevMarqGSO::_optimizeGraph");

    // if less than X nodes exist overall, do not try optimizing
    if (m_min_nodes_for_optimization > this->m_graph->nodes.size())
    {
        return;
    }

    mrpt::system::CTicTac optimization_timer;
    optimization_timer.Tic();

    // set of nodes for which the optimization procedure will take place
    std::set<mrpt::graphs::TNodeID>* nodes_to_optimize;

    // fill in the nodes in certain distance to the current node, only if
    // is_full_update is not instructed
    if (is_full_update)
    {
        // nodes_to_optimize: List of nodes to optimize. nullptr -> all but the
        // root
        // node.
        nodes_to_optimize = nullptr;
    }
    else
    {
        nodes_to_optimize = new std::set<mrpt::graphs::TNodeID>;

        // I am certain that this shall not be called when nodeCount = 0, since
        // the
        // optimization procedure starts only after certain number of nodes has
        // been added
        this->getNearbyNodesOf(
            nodes_to_optimize, this->m_graph->nodeCount() - 1,
            opt_params.optimization_distance);
        nodes_to_optimize->insert(this->m_graph->nodeCount() - 1);
    }

    graphslam::TResultInfoSpaLevMarq levmarq_info;

    // Execute the optimization
    mrpt::graphslam::optimize_graph_spa_levmarq(
        *(this->m_graph), levmarq_info, nodes_to_optimize, opt_params.cfg,
        &CLevMarqGSO<GRAPH_T>::levMarqFeedback);  // functor feedback

    if (is_full_update)
    {
        m_just_fully_optimized_graph = true;
    }
    else
    {
        m_just_fully_optimized_graph = false;
    }

    double elapsed_time = optimization_timer.Tac();
    this->logFmt(
        mrpt::system::LVL_DEBUG, "Optimization of graph took: %fs",
        elapsed_time);

    // deleting the nodes_to_optimize set
    delete nodes_to_optimize;
    nodes_to_optimize = nullptr;

    this->m_time_logger.leave("CLevMarqGSO::_optimizeGraph");
    MRPT_UNUSED_PARAM(elapsed_time);
    MRPT_END
}  // end of _optimizeGraph

template <class GRAPH_T>
bool CLevMarqGSO<GRAPH_T>::checkForLoopClosures()
{
    MRPT_START

    bool is_loop_closure = false;
    auto curr_pair_nodes_to_edge = this->m_graph->edges;

    // find the *node pairs* that exist in current but not the last
    // nodes_to_edge
    // map If the distance of any of these pairs is greater than
    // LC_min_nodeid_diff then consider this a loop closure
    typename GRAPH_T::edges_map_t::const_iterator search;
    mrpt::graphs::TPairNodeIDs curr_pair;

    for (auto it = curr_pair_nodes_to_edge.begin();
         it != curr_pair_nodes_to_edge.end(); ++it)
    {
        search = opt_params.last_pair_nodes_to_edge.find(it->first);
        // if current node pair is not found in the last set...
        if (search == opt_params.last_pair_nodes_to_edge.end())
        {
            curr_pair = it->first;

            if (std::abs(
                    static_cast<int>(curr_pair.first) -
                    static_cast<int>(curr_pair.second)) >
                opt_params.LC_min_nodeid_diff)
            {
                this->logFmt(
                    mrpt::system::LVL_DEBUG, "Registering loop closure... ");
                is_loop_closure = true;
                break;  // no need for more iterations
            }
        }
    }

    // update the pair_nodes_to_edge map
    opt_params.last_pair_nodes_to_edge = curr_pair_nodes_to_edge;
    return is_loop_closure;

    MRPT_END
}

template <class GRAPH_T>
bool CLevMarqGSO<GRAPH_T>::checkForFullOptimization()
{
    bool is_full_update = false;

    if (opt_params.optimization_distance == -1)
    {  // always optimize fully
        return true;
    }

    bool added_lc = this->checkForLoopClosures();

    // Decide on the LoopClosingAttitude I am in
    if (!added_lc)
    {  // reset both ignored and used counters
        if (m_curr_used_consec_lcs != 0 || m_curr_ignored_consec_lcs != 0)
        {
            MRPT_LOG_DEBUG_STREAM("No new Loop Closure found.");
        }

        m_curr_used_consec_lcs = 0;
        m_curr_ignored_consec_lcs = 0;
        m_optimization_policy = OptimizationPolicy::UseLoopClosures;

        return is_full_update;
    }
    else
    {  // lc found.
        // have I used enough consecutive loop closures?
        bool use_limit_reached =
            m_curr_used_consec_lcs == m_max_used_consec_lcs;
        // have I ignored enough consecutive loop closures?
        bool ignore_limit_reached =
            m_curr_ignored_consec_lcs == m_max_ignored_consec_lcs;

        // Have I reached any of the limits above?
        if (ignore_limit_reached || use_limit_reached)
        {
            m_curr_ignored_consec_lcs = 0;
            m_curr_used_consec_lcs = 0;

            // decide of the my policy on full optimization
            if (ignore_limit_reached)
            {
                m_optimization_policy = OptimizationPolicy::UseLoopClosures;
            }
            if (use_limit_reached)
            {
                m_optimization_policy = OptimizationPolicy::IgnoreLoopClosures;
            }
        }
        else
        {  // no limits reached yet.
            if (m_optimization_policy == OptimizationPolicy::UseLoopClosures)
            {
                m_curr_used_consec_lcs += 1;
            }
            else
            {
                m_curr_ignored_consec_lcs += 1;
            }
        }
    }

    // Decide on whether to fully optimize the graph based on the mode I am in
    if (m_optimization_policy == OptimizationPolicy::IgnoreLoopClosures)
    {
        is_full_update = false;
        MRPT_LOG_WARN_STREAM(
            "*PARTIAL* graph optimization.. ignoring new loop closure");
    }
    else
    {
        is_full_update = true;
        MRPT_LOG_WARN_STREAM("Commencing with *FULL* graph optimization... ");
    }
    return is_full_update;

}  // end of checkForFullOptimization

template <class GRAPH_T>
bool CLevMarqGSO<GRAPH_T>::justFullyOptimizedGraph() const
{
    return m_just_fully_optimized_graph;
}

template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::levMarqFeedback(
    const GRAPH_T& graph, const size_t iter, const size_t max_iter,
    const double cur_sq_error)
{
}

template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::getNearbyNodesOf(
    std::set<mrpt::graphs::TNodeID>* nodes_set,
    const mrpt::graphs::TNodeID& cur_nodeID, double distance)
{
    MRPT_START

    if (distance > 0)
    {
        // check all but the last node.
        for (mrpt::graphs::TNodeID nodeID = 0;
             nodeID < this->m_graph->nodeCount() - 1; ++nodeID)
        {
            double curr_distance = this->m_graph->nodes[nodeID].distanceTo(
                this->m_graph->nodes[cur_nodeID]);
            if (curr_distance <= distance)
            {
                nodes_set->insert(nodeID);
            }
        }
    }
    else
    {  // check against all nodes
        this->m_graph->getAllNodes(*nodes_set);
    }

    MRPT_END
}

template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::printParams() const
{
    parent::printParams();

    opt_params.dumpToConsole();
    viz_params.dumpToConsole();
}
template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::loadParams(const std::string& source_fname)
{
    MRPT_START
    parent::loadParams(source_fname);

    opt_params.loadFromConfigFileName(source_fname, "OptimizerParameters");
    viz_params.loadFromConfigFileName(source_fname, "VisualizationParameters");

    mrpt::config::CConfigFile source(source_fname);

    // TODO - check that these work
    m_max_used_consec_lcs = source.read_int(
        "OptimizerParameters", "max_used_consecutive_loop_closures", 2, false);

    m_max_ignored_consec_lcs = source.read_int(
        "OptimizerParameters", "max_ignored_consecutive_loop_closures", 15,
        false);

    // set the logging level if given by the user
    // Minimum verbosity level of the logger
    int min_verbosity_level =
        source.read_int("OptimizerParameters", "class_verbosity", 1, false);
    this->setMinLoggingLevel(mrpt::system::VerbosityLevel(min_verbosity_level));

    MRPT_LOG_DEBUG("Successfully loaded Params. ");
    m_has_read_config = true;

    MRPT_END
}

template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::getDescriptiveReport(std::string* report_str) const
{
    MRPT_START
    using namespace std;

    const std::string report_sep(2, '\n');
    const std::string header_sep(80, '#');

    // Report on graph
    stringstream class_props_ss;
    class_props_ss << "Levenberg Marquardt Optimization Summary: " << std::endl;
    class_props_ss << header_sep << std::endl;

    // time and output logging
    const std::string time_res = this->m_time_logger.getStatsAsText();
    const std::string output_res = this->getLogAsString();

    // merge the individual reports
    report_str->clear();
    parent::getDescriptiveReport(report_str);

    *report_str += class_props_ss.str();
    *report_str += report_sep;

    *report_str += time_res;
    *report_str += report_sep;

    *report_str += output_res;
    *report_str += report_sep;

    MRPT_END
}

template <class GRAPH_T>
CLevMarqGSO<GRAPH_T>::OptimizationParams::OptimizationParams()
    : optimization_distance_color(0, 201, 87),
      keystroke_optimization_distance("u"),
      keystroke_optimize_graph("w")
{
}
template <class GRAPH_T>
CLevMarqGSO<GRAPH_T>::OptimizationParams::~OptimizationParams() = default;
template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::OptimizationParams::dumpToTextStream(
    std::ostream& out) const
{
    MRPT_START
    out << "-----------[ Levenberg-Marquardt Optimization ] -------\n";
    out << "Optimization on second thread  = "
        << (optimization_on_second_thread ? "TRUE" : "FALSE") << std::endl;
    out << "Optimize nodes in distance     = " << optimization_distance << "\n";
    out << "Min. node difference for LC    = " << LC_min_nodeid_diff << "\n";
    out << cfg.getAsString() << std::endl;
    MRPT_END
}
template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::OptimizationParams::loadFromConfigFile(
    const mrpt::config::CConfigFileBase& source, const std::string& section)
{
    MRPT_START
    optimization_on_second_thread = source.read_bool(
        section, "optimization_on_second_thread", false, false);
    LC_min_nodeid_diff = source.read_int(
        "GeneralConfiguration", "LC_min_nodeid_diff", 30, false);
    optimization_distance =
        source.read_double(section, "optimization_distance", 5, false);
    // asert the previous value
    ASSERTDEBMSG_(
        optimization_distance == 1 || optimization_distance > 0,
        format(
            "Invalid value for optimization distance: %.2f",
            optimization_distance));

    // optimization parameters
    cfg["verbose"] = source.read_bool(section, "verbose", false, false);
    cfg["profiler"] = source.read_bool(section, "profiler", false, false);
    cfg["max_iterations"] =
        source.read_double(section, "max_iterations", 100, false);
    cfg["scale_hessian"] =
        source.read_double("Optimization", "scale_hessian", 0.2, false);
    cfg["tau"] = source.read_double(section, "tau", 1e-3, false);

    MRPT_END
}

template <class GRAPH_T>
CLevMarqGSO<GRAPH_T>::GraphVisualizationParams::GraphVisualizationParams()
    : keystroke_graph_toggle("s"), keystroke_graph_autofit("a")
{
}
template <class GRAPH_T>
CLevMarqGSO<GRAPH_T>::GraphVisualizationParams::~GraphVisualizationParams() =
    default;
template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::GraphVisualizationParams::dumpToTextStream(
    std::ostream& out) const
{
    MRPT_START

    out << "-----------[ Graph Visualization Parameters ]-----------\n";
    out << mrpt::format(
        "Visualize optimized graph = %s\n",
        visualize_optimized_graph ? "TRUE" : "FALSE");

    out << mrpt::format("%s", cfg.getAsString().c_str());

    std::cout << std::endl;

    MRPT_END
}
template <class GRAPH_T>
void CLevMarqGSO<GRAPH_T>::GraphVisualizationParams::loadFromConfigFile(
    const mrpt::config::CConfigFileBase& source, const std::string& section)
{
    MRPT_START

    visualize_optimized_graph =
        source.read_bool(section, "visualize_optimized_graph", true, false);

    cfg["show_ID_labels"] =
        source.read_bool(section, "optimized_show_ID_labels", false, false);
    cfg["show_ground_grid"] =
        source.read_double(section, "optimized_show_ground_grid", 1, false);
    cfg["show_edges"] =
        source.read_bool(section, "optimized_show_edges", true, false);
    cfg["edge_color"] =
        source.read_int(section, "optimized_edge_color", 1500, false);
    cfg["edge_width"] =
        source.read_double(section, "optimized_edge_width", 1.5, false);
    cfg["show_node_corners"] =
        source.read_bool(section, "optimized_show_node_corners", true, false);
    cfg["show_edge_rel_poses"] =
        source.read_bool(section, "optimized_show_edge_rel_poses", true, false);
    cfg["edge_rel_poses_color"] =
        source.read_int(section, "optimized_edge_rel_poses_color", 2000, false);
    cfg["nodes_edges_corner_scale"] = source.read_double(
        section, "optimized_nodes_edges_corner_scale", 0.4, false);
    cfg["nodes_corner_scale"] =
        source.read_double(section, "optimized_nodes_corner_scale", 0.7, false);
    cfg["nodes_point_size"] =
        source.read_int(section, "optimized_nodes_point_size", 5, false);
    cfg["nodes_point_color"] =
        source.read_int(section, "optimized_nodes_point_color", 3000, false);

    MRPT_END
}
}  // namespace mrpt::graphslam::optimizers