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 #ifndef RecoTracker_MkFitCore_interface_IterationConfig_h
 #define RecoTracker_MkFitCore_interface_IterationConfig_h
 
 #include "RecoTracker/MkFitCore/interface/FunctionTypes.h"
 #include "RecoTracker/MkFitCore/interface/SteeringParams.h"
 
 #include "nlohmann/json_fwd.hpp"
 
 #include <functional>
 
 namespace mkfit {
 
   //==============================================================================
   // Hit masks / IterationMaskIfc
   //==============================================================================
 
   struct IterationMaskIfcBase {
     virtual ~IterationMaskIfcBase() {}
 
     virtual const std::vector<bool> *get_mask_for_layer(int layer) const { return nullptr; }
   };
 
   struct IterationMaskIfc : public IterationMaskIfcBase {
     std::vector<std::vector<bool>> m_mask_vector;
 
     const std::vector<bool> *get_mask_for_layer(int layer) const override { return &m_mask_vector[layer]; }
   };
 
   //==============================================================================
   // IterationLayerConfig
   //==============================================================================
 
   class IterationConfig;
 
   class IterationLayerConfig {
   public:
     int m_layer = -1;
     // Selection limits.
     float m_select_min_dphi;
     float m_select_max_dphi;
     float m_select_min_dq;
     float m_select_max_dq;
 
     void set_selection_limits(float p1, float p2, float q1, float q2) {
       m_select_min_dphi = p1;
       m_select_max_dphi = p2;
       m_select_min_dq = q1;
       m_select_max_dq = q2;
     }
 
     //----------------------------------------------------------------------------
 
     float min_dphi() const { return m_select_min_dphi; }
     float max_dphi() const { return m_select_max_dphi; }
     float min_dq() const { return m_select_min_dq; }
     float max_dq() const { return m_select_max_dq; }
 
     const std::vector<float> &get_window_params(bool forward, bool fallback_to_other) const {
       if (fallback_to_other) {
         // Empty vector is a valid result, we do not need to check both.
         if (forward)
           return m_winpars_fwd.empty() ? m_winpars_bkw : m_winpars_fwd;
         else
           return m_winpars_bkw.empty() ? m_winpars_fwd : m_winpars_bkw;
       } else {
         return forward ? m_winpars_fwd : m_winpars_bkw;
       }
     }
 
     //Hit selection window parameters: 2D fit/layer (72 in phase-1 CMS geometry).
     //Used in MkFinder::selectHitIndices().
     std::vector<float> m_winpars_fwd;
     std::vector<float> m_winpars_bkw;
 
     //----------------------------------------------------------------------------
 
     IterationLayerConfig() {}
   };
 
   //==============================================================================
   // IterationParams
   //==============================================================================
 
   class IterationParams {
   public:
     int nlayers_per_seed = 3;
     int maxCandsPerSeed = 5;
     int maxHolesPerCand = 4;
     int maxConsecHoles = 1;
     float chi2Cut_min = 15.0;
     float chi2CutOverlap = 3.5;
     float pTCutOverlap = 0.0;
     bool recheckOverlap = false;
     bool useHitSelectionV2 = false;
 
     //quality filter params
     int minHitsQF = 4;
 
     //min pT cut
     float minPtCut = 0.0;
 
     //max cluster size cut for SiStrip hits
     unsigned int maxClusterSize = 8;
   };
 
   //==============================================================================
   // IterationSeedPartition
   //==============================================================================
 
   class IterationSeedPartition {
   public:
     using register_seed_phi_eta_foo = void(float, float);
 
     std::vector<int> m_region;
     std::function<register_seed_phi_eta_foo> m_phi_eta_foo;
 
     IterationSeedPartition(int size) : m_region(size) {}
   };
 
   //==============================================================================
   // IterationConfig
   //==============================================================================
 
   class IterationConfig {
   public:
     int m_iteration_index = -1;
     int m_track_algorithm = -1;
 
     bool m_requires_seed_hit_sorting = false;
 
     bool m_backward_search = false;
     bool m_backward_drop_seed_hits = false;
 
     int m_backward_fit_min_hits = -1;  // Min number of hits to keep when m_backward_drop_seed_hits is true
 
     // seed cleaning params with good defaults (all configurable)
     float sc_ptthr_hpt = 2.0;
     float sc_drmax_bh = 0.010;
     float sc_dzmax_bh = 0.005;
     float sc_drmax_eh = 0.020;
     float sc_dzmax_eh = 0.020;
     float sc_drmax_bl = 0.010;
     float sc_dzmax_bl = 0.005;
     float sc_drmax_el = 0.030;
     float sc_dzmax_el = 0.030;
 
     // duplicate cleaning params with good defaults (all configurable)
     float dc_fracSharedHits = 0.19;
     float dc_drth_central = 0.001;
     float dc_drth_obarrel = 0.001;
     float dc_drth_forward = 0.001;
 
     // Iteration parameters (could be a ptr)
     IterationParams m_params;
     IterationParams m_backward_params;
 
     int m_n_regions = -1;
     std::vector<int> m_region_order;
     std::vector<SteeringParams> m_steering_params;
     std::vector<IterationLayerConfig> m_layer_configs;
 
     // *** Standard functions
     // - seed cleaning: called directly from top-level per-iteration steering code.
     clean_seeds_func m_seed_cleaner;
     // - seed partitioning into eta regions: called from MkBuilder::find_tracks_load_seeds().
     partition_seeds_func m_seed_partitioner;
     // - candidate filtering: passed to MkBuilder::filter_comb_cands().
     filter_candidates_func m_pre_bkfit_filter, m_post_bkfit_filter;
     // - duplicate cleaning: called directly from top-level per-iteration steering code.
     clean_duplicates_func m_duplicate_cleaner;
     // - default track scoring function, can be overriden in SteeringParams for each eta region.
     track_score_func m_default_track_scorer;
 
     // Names for Standard functions that get saved to / loaded from JSON.
     std::string m_seed_cleaner_name;
     std::string m_seed_partitioner_name;
     std::string m_pre_bkfit_filter_name, m_post_bkfit_filter_name;
     std::string m_duplicate_cleaner_name;
     std::string m_default_track_scorer_name = "default";
 
     //----------------------------------------------------------------------------
 
     IterationConfig() {}
 
     // -------- Getter functions
 
     IterationLayerConfig &layer(int i) { return m_layer_configs[i]; }
     SteeringParams &steering_params(int region) { return m_steering_params[region]; }
 
     bool merge_seed_hits_during_cleaning() const { return m_backward_search && m_backward_drop_seed_hits; }
 
     // -------- Setup functions
 
     void setupStandardFunctionsFromNames();
 
     void cloneLayerSteerCore(const IterationConfig &o) {
       // Clone common settings for an iteration.
       // m_iteration_index, m_track_algorithm, cleaning and bkw-search flags,
       // and IterationParams are not copied.
       // Standard functions are also not copied, only their names so one should
       // call setupStandardFunctionsFromNames() later on.
 
       m_n_regions = o.m_n_regions;
       m_region_order = o.m_region_order;
       m_steering_params = o.m_steering_params;
       m_layer_configs = o.m_layer_configs;
 
       m_seed_cleaner_name = o.m_seed_cleaner_name;
       m_seed_partitioner_name = o.m_seed_partitioner_name;
       m_pre_bkfit_filter_name = o.m_pre_bkfit_filter_name;
       m_post_bkfit_filter_name = o.m_post_bkfit_filter_name;
       m_duplicate_cleaner_name = o.m_duplicate_cleaner_name;
       m_default_track_scorer_name = o.m_default_track_scorer_name;
     }
 
     void set_iteration_index_and_track_algorithm(int idx, int trk_alg) {
       m_iteration_index = idx;
       m_track_algorithm = trk_alg;
     }
 
     void set_dupl_params(float sharedFrac, float drthCentral, float drthObarrel, float drthForward) {
       dc_fracSharedHits = sharedFrac;
       dc_drth_central = drthCentral;
       dc_drth_obarrel = drthObarrel;
       dc_drth_forward = drthForward;
     }
 
     void set_seed_cleaning_params(float pt_thr,
                                   float dzmax_bh,
                                   float drmax_bh,
                                   float dzmax_bl,
                                   float drmax_bl,
                                   float dzmax_eh,
                                   float drmax_eh,
                                   float dzmax_el,
                                   float drmax_el) {
       sc_ptthr_hpt = pt_thr;
       sc_drmax_bh = drmax_bh;
       sc_dzmax_bh = dzmax_bh;
       sc_drmax_eh = drmax_eh;
       sc_dzmax_eh = dzmax_eh;
       sc_drmax_bl = drmax_bl;
       sc_dzmax_bl = dzmax_bl;
       sc_drmax_el = drmax_el;
       sc_dzmax_el = dzmax_el;
     }
 
     void set_num_regions_layers(int nreg, int nlay) {
       m_n_regions = nreg;
       m_region_order.resize(nreg);
       m_steering_params.resize(nreg);
       for (int i = 0; i < nreg; ++i)
         m_steering_params[i].m_region = i;
       m_layer_configs.resize(nlay);
       for (int i = 0; i < nlay; ++i)
         m_layer_configs[i].m_layer = i;
     }
 
     // Catalog of Standard functions
     static void register_seed_cleaner(const std::string &name, clean_seeds_func func);
     static void register_seed_partitioner(const std::string &name, partition_seeds_func func);
     static void register_candidate_filter(const std::string &name, filter_candidates_func func);
     static void register_duplicate_cleaner(const std::string &name, clean_duplicates_func func);
     static void register_track_scorer(const std::string &name, track_score_func func);
 
     static clean_seeds_func get_seed_cleaner(const std::string &name);
     static partition_seeds_func get_seed_partitioner(const std::string &name);
     static filter_candidates_func get_candidate_filter(const std::string &name);
     static clean_duplicates_func get_duplicate_cleaner(const std::string &name);
     static track_score_func get_track_scorer(const std::string &name);
   };
 
   //==============================================================================
   // IterationsInfo
   //==============================================================================
 
   class IterationsInfo {
   public:
     std::vector<IterationConfig> m_iterations;
 
     IterationsInfo() {}
 
     void resize(int ni) { m_iterations.resize(ni); }
 
     int size() const { return m_iterations.size(); }
 
     IterationConfig &operator[](int i) { return m_iterations[i]; }
     const IterationConfig &operator[](int i) const { return m_iterations[i]; }
 
     void setupStandardFunctionsFromNames() {
       for (auto &i : m_iterations)
         i.setupStandardFunctionsFromNames();
     }
   };
 
   //==============================================================================
 
   // IterationConfig instances are created in Geoms/CMS-phase1.cc, Create_CMS_phase1(),
   // filling the IterationsInfo object passed in by reference.
 
   //==============================================================================
   // JSON config interface
   //==============================================================================
 
   class ConfigJsonPatcher {
   public:
     struct PatchReport {
       int n_files = 0;
       int n_json_entities = 0;
       int n_replacements = 0;
 
       void inc_counts(int f, int e, int r) {
         n_files += f;
         n_json_entities += e;
         n_replacements += r;
       }
       void inc_counts(const PatchReport &pr) {
         n_files += pr.n_files;
         n_json_entities += pr.n_json_entities;
         n_replacements += pr.n_replacements;
       }
       void reset() { n_files = n_json_entities = n_replacements = 0; }
     };
 
   private:
     std::unique_ptr<nlohmann::json> m_json;
     nlohmann::json *m_current = nullptr;
 
     // add stack and cd_up() ? also, name stack for exceptions and printouts
     std::vector<nlohmann::json *> m_json_stack;
     std::vector<std::string> m_path_stack;
 
     bool m_verbose = false;
 
     std::string get_abs_path() const;
     std::string exc_hdr(const char *func = nullptr) const;
 
   public:
     ConfigJsonPatcher(bool verbose = false);
     ~ConfigJsonPatcher();
 
     template <class T>
     void load(const T &o);
     template <class T>
     void save(T &o);
 
     void cd(const std::string &path);
     void cd_up(const std::string &path = "");
     void cd_top(const std::string &path = "");
 
     template <typename T>
     void replace(const std::string &path, T val);
 
     template <typename T>
     void replace(int first, int last, const std::string &path, T val);
 
     nlohmann::json &get(const std::string &path);
 
     int replace(const nlohmann::json &j);
 
     std::string dump(int indent = 2);
   };
 
   class ConfigJson {
   public:
     ConfigJson(bool verbose = false) : m_verbose(verbose) {}
 
     // Patch IterationsInfo from a vector of files.
     // Assumes patch files include iteration-info preambles, i.e., they
     // were saved with include_iter_info_preamble=true.
     // If report is non-null counts are added to existing object.
     void patch_Files(IterationsInfo &its_info,
                      const std::vector<std::string> &fnames,
                      ConfigJsonPatcher::PatchReport *report = nullptr);
 
     // Load a single iteration from JSON file.
     // Searches for a match between m_algorithm in its_info and in JSON file to decide
     // which IterationConfig it will clone and patch-load the JSON file over.
     // The IterationConfig in question *must* match in structure to what is on file,
     // in particular, arrays must be of same lengths.
     // Assumes JSON file has been saved WITHOUT iteration-info preamble.
     // Returns a unique_ptr to the cloned IterationConfig.
     // If report is non-null counts are added to existing object.
     std::unique_ptr<IterationConfig> patchLoad_File(const IterationsInfo &its_info,
                                                     const std::string &fname,
                                                     ConfigJsonPatcher::PatchReport *report = nullptr);
 
     // Load a single iteration from JSON file.
     // This leaves IterationConfig data-members that are not registered
     // in JSON schema at their default values.
     // There are several std::function members like this.
     // Assumes JSON file has been saved WITHOUT iteration-info preamble.
     // Returns a unique_ptr to the cloned IterationConfig.
     std::unique_ptr<IterationConfig> load_File(const std::string &fname);
 
     void save_Iterations(IterationsInfo &its_info, const std::string &fname_fmt, bool include_iter_info_preamble);
 
     void dump(IterationsInfo &its_info);
 
     void test_Direct(IterationConfig &it_cfg);
     void test_Patcher(IterationConfig &it_cfg);
 
   private:
     bool m_verbose = false;
   };
 }  // end namespace mkfit
 
 #endif

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