SeedFinderSelector.cc

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#include "FastSimulation/Tracking/interface/SeedFinderSelector.h"

// framework
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/Event.h"

// track reco
#include "RecoTracker/MeasurementDet/interface/MeasurementTracker.h"
#include "RecoTracker/TkHitPairs/interface/RecHitsSortedInPhi.h"
#include "RecoTracker/TkHitPairs/interface/HitPairGeneratorFromLayerPair.h"
#include "DataFormats/SiPixelDetId/interface/PixelSubdetector.h"
#include "RecoTracker/TkSeedGenerator/interface/MultiHitGeneratorFromPairAndLayers.h"
#include "RecoTracker/TkSeedGenerator/interface/MultiHitGeneratorFromPairAndLayersFactory.h"
#include "RecoTracker/Record/interface/CkfComponentsRecord.h"
#include "RecoPixelVertexing/PixelTriplets/interface/HitTripletGeneratorFromPairAndLayers.h"
#include "RecoPixelVertexing/PixelTriplets/interface/HitTripletGeneratorFromPairAndLayersFactory.h"
#include "RecoPixelVertexing/PixelTriplets/interface/CAHitTripletGenerator.h"
#include "RecoPixelVertexing/PixelTriplets/interface/CAHitQuadrupletGenerator.h"
#include "RecoPixelVertexing/PixelTriplets/interface/OrderedHitSeeds.h"
#include "RecoTracker/TkHitPairs/interface/IntermediateHitDoublets.h"
// data formats
#include "DataFormats/TrackerRecHit2D/interface/FastTrackerRecHit.h"

SeedFinderSelector::SeedFinderSelector(const edm::ParameterSet & cfg,edm::ConsumesCollector && consumesCollector)
    : trackingRegion_(nullptr)
    , eventSetup_(nullptr)
    , measurementTracker_(nullptr)
    , measurementTrackerLabel_(cfg.getParameter<std::string>("measurementTracker"))
{
    if(cfg.exists("pixelTripletGeneratorFactory"))
    {
        const edm::ParameterSet & tripletConfig = cfg.getParameter<edm::ParameterSet>("pixelTripletGeneratorFactory");
        pixelTripletGenerator_.reset(HitTripletGeneratorFromPairAndLayersFactory::get()->create(tripletConfig.getParameter<std::string>("ComponentName"),tripletConfig,consumesCollector));
    }

    if(cfg.exists("MultiHitGeneratorFactory"))
    {
        const edm::ParameterSet & tripletConfig = cfg.getParameter<edm::ParameterSet>("MultiHitGeneratorFactory");
        multiHitGenerator_.reset(MultiHitGeneratorFromPairAndLayersFactory::get()->create(tripletConfig.getParameter<std::string>("ComponentName"),tripletConfig));
    }

    if(cfg.exists("CAHitTripletGeneratorFactory"))
    {
        const edm::ParameterSet & tripletConfig = cfg.getParameter<edm::ParameterSet>("CAHitTripletGeneratorFactory");
    CAHitTriplGenerator_ = std::make_unique<CAHitTripletGenerator>(tripletConfig,consumesCollector);
    seedingLayers_ = std::make_unique<SeedingLayerSetsBuilder>(cfg, consumesCollector, edm::InputTag("fastTrackerRecHits")); //calling the new FastSim specific constructor to make SeedingLayerSetsHits pointer for triplet iterations
        layerPairs_ = cfg.getParameter<std::vector<unsigned>>("layerPairs"); //allowed layer pairs for CA triplets
    }

    if(cfg.exists("CAHitQuadrupletGeneratorFactory"))
    {
        const edm::ParameterSet & quadrupletConfig = cfg.getParameter<edm::ParameterSet>("CAHitQuadrupletGeneratorFactory");
    CAHitQuadGenerator_ = std::make_unique<CAHitQuadrupletGenerator>(quadrupletConfig, consumesCollector);
    seedingLayers_ = std::make_unique<SeedingLayerSetsBuilder>(cfg, consumesCollector, edm::InputTag("fastTrackerRecHits")); //calling the new FastSim specific constructor to make SeedingLayerSetsHits pointer for quadruplet iterations
    layerPairs_ = cfg.getParameter<std::vector<unsigned>>("layerPairs"); //allowed layer pairs for CA quadruplets
    }

    if((pixelTripletGenerator_ && multiHitGenerator_) || (CAHitTriplGenerator_ && pixelTripletGenerator_) || (CAHitTriplGenerator_ && multiHitGenerator_))
      {
    throw cms::Exception("FastSimTracking") << "It is forbidden to specify together 'pixelTripletGeneratorFactory', 'CAHitTripletGeneratorFactory' and 'MultiHitGeneratorFactory' in configuration of SeedFinderSelection";
      }
    if((pixelTripletGenerator_ && CAHitQuadGenerator_) || (CAHitTriplGenerator_ && CAHitQuadGenerator_) || (multiHitGenerator_ && CAHitQuadGenerator_))
      {
    throw cms::Exception("FastSimTracking") << "It is forbidden to specify 'CAHitQuadrupletGeneratorFactory' together with 'pixelTripletGeneratorFactory', 'CAHitTripletGeneratorFactory' or 'MultiHitGeneratorFactory' in configuration of SeedFinderSelection";
      }  
}


SeedFinderSelector::~SeedFinderSelector(){;}

void SeedFinderSelector::initEvent(const edm::Event & ev,const edm::EventSetup & es)
{
    eventSetup_ = &es;
     
    edm::ESHandle<MeasurementTracker> measurementTrackerHandle;
    es.get<CkfComponentsRecord>().get(measurementTrackerLabel_, measurementTrackerHandle);
    es.get<TrackerTopologyRcd>().get(trackerTopology);
    measurementTracker_ = &(*measurementTrackerHandle);

    if(multiHitGenerator_)
    {
        multiHitGenerator_->initES(es);
    }

    //for CA triplet iterations
    if(CAHitTriplGenerator_){
      seedingLayer = seedingLayers_->makeSeedingLayerSetsHitsforFastSim(ev, es);
      CAHitTriplGenerator_->initEvent(ev,es);
    }
    //for CA quadruplet iterations
    if(CAHitQuadGenerator_){
      seedingLayer = seedingLayers_->makeSeedingLayerSetsHitsforFastSim(ev, es);
      CAHitQuadGenerator_->initEvent(ev,es);
    }    
}


bool SeedFinderSelector::pass(const std::vector<const FastTrackerRecHit *>& hits) const
{
    if(!measurementTracker_ || !eventSetup_)
    {
    throw cms::Exception("FastSimTracking") << "ERROR: event not initialized";
    }
    if(!trackingRegion_)
    {
    throw cms::Exception("FastSimTracking") << "ERROR: trackingRegion not set";
    }


    // check the inner 2 hits
    if(hits.size() < 2)
    {
    throw cms::Exception("FastSimTracking") << "SeedFinderSelector::pass requires at least 2 hits";
    }
    const DetLayer * firstLayer = measurementTracker_->geometricSearchTracker()->detLayer(hits[0]->det()->geographicalId());
    const DetLayer * secondLayer = measurementTracker_->geometricSearchTracker()->detLayer(hits[1]->det()->geographicalId());
    
    std::vector<BaseTrackerRecHit const *> firstHits{hits[0]};
    std::vector<BaseTrackerRecHit const *> secondHits{hits[1]};
    
    const RecHitsSortedInPhi fhm(firstHits, trackingRegion_->origin(), firstLayer);
    const RecHitsSortedInPhi shm(secondHits, trackingRegion_->origin(), secondLayer);
    
    HitDoublets result(fhm,shm);
    HitPairGeneratorFromLayerPair::doublets(*trackingRegion_,*firstLayer,*secondLayer,fhm,shm,*eventSetup_,0,result);
    
    if(result.empty())
    {
    return false;
    }
    
    // check the inner 3 hits
    if(pixelTripletGenerator_ || multiHitGenerator_ || CAHitTriplGenerator_)
    {
    if(hits.size() < 3)
    {
        throw cms::Exception("FastSimTracking") << "For the given configuration, SeedFinderSelector::pass requires at least 3 hits";
    }
    const DetLayer * thirdLayer = measurementTracker_->geometricSearchTracker()->detLayer(hits[2]->det()->geographicalId());
    std::vector<const DetLayer *> thirdLayerDetLayer(1,thirdLayer);
    std::vector<BaseTrackerRecHit const *> thirdHits{hits[2]};
        const RecHitsSortedInPhi thm(thirdHits,trackingRegion_->origin(), thirdLayer);
    const RecHitsSortedInPhi * thmp =&thm;
    
    if(pixelTripletGenerator_)
    {
        OrderedHitTriplets tripletresult;
        pixelTripletGenerator_->hitTriplets(*trackingRegion_,tripletresult,*eventSetup_,result,&thmp,thirdLayerDetLayer,1);
        return !tripletresult.empty();
    }
    else if(multiHitGenerator_)
    {
        OrderedMultiHits  tripletresult;
        multiHitGenerator_->hitTriplets(*trackingRegion_,tripletresult,*eventSetup_,result,&thmp,thirdLayerDetLayer,1);
        return !tripletresult.empty();
    }
    //new for Phase1
    else if(CAHitTriplGenerator_)
    {  
      if(!seedingLayer)
        throw cms::Exception("FastSimTracking") << "ERROR: SeedingLayers pointer not set for CATripletGenerator";

      SeedingLayerSetsHits & layers = *seedingLayer;
      //constructing IntermediateHitDoublets to be passed onto CAHitTripletGenerator::hitNtuplets()
      IntermediateHitDoublets ihd(&layers);
      const TrackingRegion& tr_ = *trackingRegion_;
      auto filler = ihd.beginRegion(&tr_); 

      //Forming doublets for CA triplets from the allowed layer pair combinations:(0,1),(1,2)
      std::string hitPair[3];
      hitPair[0] = Layer_name(hits[0]);
      hitPair[1] = Layer_name(hits[1]);
      hitPair[2] = Layer_name(hits[2]);

      //extracting the DetLayer of the hits                                                                                                                                
          const DetLayer * fLayer = measurementTracker_->geometricSearchTracker()->detLayer(hits[0]->det()->geographicalId());
          const DetLayer * sLayer = measurementTracker_->geometricSearchTracker()->detLayer(hits[1]->det()->geographicalId());
          const DetLayer * tLayer = measurementTracker_->geometricSearchTracker()->detLayer(hits[2]->det()->geographicalId());

          //converting FastTrackerRecHit hits to BaseTrackerRecHit                                                                                                            
      std::vector<BaseTrackerRecHit const *> fHits{hits[0]};
      std::vector<BaseTrackerRecHit const *> sHits{hits[1]};
      std::vector<BaseTrackerRecHit const *> tHits{hits[2]};

          //forming the SeedingLayerSet for the hit doublets                                                                                                                   
      SeedingLayerSetsHits::SeedingLayerSet pairCandidate1, pairCandidate2;
          for(SeedingLayerSetsHits::SeedingLayerSet ls : *seedingLayer){
        SeedingLayerSetsHits::SeedingLayerSet pairCandidate;
            for(const auto p : layerPairs_){
              pairCandidate = ls.slice(p,p+2);
              if(p==0 && hitPair[0] == pairCandidate[0].name() && hitPair[1] == pairCandidate[1].name())
                pairCandidate1=pairCandidate;
              if(p==1 && hitPair[1] == pairCandidate[0].name() && hitPair[2] == pairCandidate[1].name())
                pairCandidate2=pairCandidate;
            }
          }

      //Important: hits of the layer to be added to LayerHitMapCache                                                                                                       
          auto& layerCache = filler.layerHitMapCache();

          //doublets for CA triplets from the allowed layer pair combinations:(0,1),(1,2) and storing in filler                                                                
          const RecHitsSortedInPhi & firsthm = *layerCache.add(pairCandidate1[0], std::make_unique<RecHitsSortedInPhi>(fHits, trackingRegion_->origin(), fLayer));
          const RecHitsSortedInPhi & secondhm = *layerCache.add(pairCandidate1[1], std::make_unique<RecHitsSortedInPhi>(sHits, trackingRegion_->origin(), sLayer));
          HitDoublets res1(firsthm,secondhm);
      HitPairGeneratorFromLayerPair::doublets(*trackingRegion_,*fLayer,*sLayer,firsthm,secondhm,*eventSetup_,0,res1);
          filler.addDoublets(pairCandidate1, std::move(res1));
          const RecHitsSortedInPhi & thirdhm = *layerCache.add(pairCandidate2[1], std::make_unique<RecHitsSortedInPhi>(tHits, trackingRegion_->origin(), tLayer));
          HitDoublets res2(secondhm,thirdhm);
      HitPairGeneratorFromLayerPair::doublets(*trackingRegion_,*sLayer,*tLayer,secondhm,thirdhm,*eventSetup_,0,res2);
          filler.addDoublets(pairCandidate2, std::move(res2));

      std::vector<OrderedHitSeeds> tripletresult;                                
      tripletresult.resize(ihd.regionSize());
      for(auto& ntuplet : tripletresult)
        ntuplet.reserve(3);
      CAHitTriplGenerator_->hitNtuplets(ihd,tripletresult,*eventSetup_,*seedingLayer); //calling the function from the class, modifies tripletresult
          return !tripletresult.empty();
    }
    }
    //new for Phase1     
    if(CAHitQuadGenerator_)
    {
      if(hits.size() < 4)
    {
      throw cms::Exception("FastSimTracking") << "For the given configuration, SeedFinderSelector::pass requires at least 4 hits";
    }

      if(!seedingLayer)
    throw cms::Exception("FastSimTracking") << "ERROR: SeedingLayers pointer not set for CAHitQuadrupletGenerator";      

      SeedingLayerSetsHits & layers = *seedingLayer;
      //constructing IntermediateHitDoublets to be passed onto CAHitQuadrupletGenerator::hitNtuplets()
      IntermediateHitDoublets ihd(&layers);
      const TrackingRegion& tr_ = *trackingRegion_;
      auto filler = ihd.beginRegion(&tr_);
      
      //Forming doublets for CA quadruplets from the allowed layer pair combinations:(0,1),(1,2),(2,3)
      std::string hitPair[4];
      hitPair[0] = Layer_name(hits[0]);
      hitPair[1] = Layer_name(hits[1]);
      hitPair[2] = Layer_name(hits[2]);
      hitPair[3] = Layer_name(hits[3]);

      //extracting the DetLayer of the hits                                                                                                                                    
      const DetLayer * fLayer = measurementTracker_->geometricSearchTracker()->detLayer(hits[0]->det()->geographicalId());
      const DetLayer * sLayer = measurementTracker_->geometricSearchTracker()->detLayer(hits[1]->det()->geographicalId());
      const DetLayer * tLayer = measurementTracker_->geometricSearchTracker()->detLayer(hits[2]->det()->geographicalId());
      const DetLayer * frLayer = measurementTracker_->geometricSearchTracker()->detLayer(hits[3]->det()->geographicalId());

      //converting FastTrackerRecHit hits to BaseTrackerRecHit                                                                                                                 
      std::vector<BaseTrackerRecHit const *> fHits{hits[0]};
      std::vector<BaseTrackerRecHit const *> sHits{hits[1]};
      std::vector<BaseTrackerRecHit const *> tHits{hits[2]};
      std::vector<BaseTrackerRecHit const *> frHits{hits[3]};

      //forming the SeedingLayerSet for the hit doublets                                                                                                                       
      SeedingLayerSetsHits::SeedingLayerSet pairCandidate1, pairCandidate2, pairCandidate3;
      for(SeedingLayerSetsHits::SeedingLayerSet ls : *seedingLayer){
    SeedingLayerSetsHits::SeedingLayerSet pairCandidate;
        for(const auto p : layerPairs_){
          pairCandidate = ls.slice(p,p+2);
          if(p==0 && hitPair[0] == pairCandidate[0].name() && hitPair[1] == pairCandidate[1].name())
            pairCandidate1=pairCandidate;
          if(p==1 && hitPair[1] == pairCandidate[0].name() && hitPair[2] == pairCandidate[1].name())
            pairCandidate2=pairCandidate;
          if(p==2 && hitPair[2] == pairCandidate[0].name() && hitPair[3] == pairCandidate[1].name())
            pairCandidate3=pairCandidate;
        }
      }

      //Important: hits of the layer to be added to LayerHitMapCache                                                                                                           
      auto& layerCache = filler.layerHitMapCache();

      //doublets for CA quadruplets from the allowed layer pair combinations:(0,1),(1,2),(2,3) and storing in filler                                                           
      const RecHitsSortedInPhi & firsthm = *layerCache.add(pairCandidate1[0], std::make_unique<RecHitsSortedInPhi>(fHits, trackingRegion_->origin(), fLayer));
      const RecHitsSortedInPhi & secondhm = *layerCache.add(pairCandidate1[1], std::make_unique<RecHitsSortedInPhi>(sHits, trackingRegion_->origin(), sLayer));
      HitDoublets res1(firsthm,secondhm);
      HitPairGeneratorFromLayerPair::doublets(*trackingRegion_,*fLayer,*sLayer,firsthm,secondhm,*eventSetup_,0,res1);
      filler.addDoublets(pairCandidate1, std::move(res1));
      const RecHitsSortedInPhi & thirdhm = *layerCache.add(pairCandidate2[1], std::make_unique<RecHitsSortedInPhi>(tHits, trackingRegion_->origin(), tLayer));
      HitDoublets res2(secondhm,thirdhm);
      HitPairGeneratorFromLayerPair::doublets(*trackingRegion_,*sLayer,*tLayer,secondhm,thirdhm,*eventSetup_,0,res2);
      filler.addDoublets(pairCandidate2, std::move(res2));
      const RecHitsSortedInPhi & fourthhm = *layerCache.add(pairCandidate3[1], std::make_unique<RecHitsSortedInPhi>(frHits, trackingRegion_->origin(), frLayer));
      HitDoublets res3(thirdhm, fourthhm);
      HitPairGeneratorFromLayerPair::doublets(*trackingRegion_,*tLayer,*frLayer,thirdhm,fourthhm,*eventSetup_,0,res3);
      filler.addDoublets(pairCandidate3, std::move(res3));
      
      std::vector<OrderedHitSeeds> quadrupletresult;
      quadrupletresult.resize(ihd.regionSize());
      for(auto& ntuplet : quadrupletresult)
    ntuplet.reserve(4);
      CAHitQuadGenerator_->hitNtuplets(ihd,quadrupletresult,*eventSetup_,*seedingLayer); //calling the function from the class, modifies quadrupletresult
      return !quadrupletresult.empty();  
    }    

    return true;
    
}

//new for Phase1
std::string SeedFinderSelector::Layer_name(const FastTrackerRecHit * hit) const
{
  std::string name="UNKWN";
  const TrackerTopology* const tTopo = trackerTopology.product();
  int idLayer = 0;
  if( (hit->det()->geographicalId()).subdetId() == PixelSubdetector::PixelBarrel){
    idLayer = tTopo->pxbLayer(hit->det()->geographicalId());
    name = "BPix"+std::to_string(idLayer);
  }
  else if ((hit->det()->geographicalId()).subdetId() == PixelSubdetector::PixelEndcap){
    idLayer = tTopo->pxfDisk(hit->det()->geographicalId());
    if(tTopo->pxfSide(hit->det()->geographicalId())==1)
      name = "FPix"+std::to_string(idLayer)+"_neg";
    else
      name = "FPix"+std::to_string(idLayer)+"_pos";
  }
  return name;
}