SpacePointSolver_module.cc

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// Christopher Backhouse - bckhouse@fnal.gov

// Test file at Caltech: /nfs/raid11/dunesam/prodgenie_nu_dune10kt_1x2x6_mcc7.0/prodgenie_nu_dune10kt_1x2x6_63_20160811T171439_merged.root

// C/C++ standard libraries
#include <iostream>
#include <string>

// framework libraries
#include "art/Framework/Core/EDProducer.h"
#include "art/Framework/Core/ModuleMacros.h"
#include "art/Framework/Principal/Event.h"
#include "art/Framework/Principal/Handle.h"
#include "art/Framework/Services/Registry/ServiceHandle.h"
#include "art/Utilities/make_tool.h"
#include "canvas/Persistency/Common/Assns.h"
#include "canvas/Persistency/Common/Ptr.h"
#include "cetlib/pow.h"
#include "fhiclcpp/ParameterSet.h"

// LArSoft libraries
#include "larcore/Geometry/Geometry.h"
#include "larcoreobj/SimpleTypesAndConstants/RawTypes.h" // raw::ChannelID_t
#include "lardata/ArtDataHelper/ChargedSpacePointCreator.h"
#include "lardata/DetectorInfoServices/DetectorPropertiesService.h"
#include "lardataobj/RecoBase/SpacePoint.h"

#include "larevt/CalibrationDBI/Interface/ChannelStatusProvider.h"
#include "larevt/CalibrationDBI/Interface/ChannelStatusService.h"

#include "larreco/SpacePointSolver/HitReaders/IHitReader.h"

#include "Solver.h"
#include "TripletFinder.h"

namespace reco3d {

  /// The position in the drift direction that an induction wire's time implies
  /// depends on which TPC we assume the hit originated in.
  struct InductionWireWithXPos {
    InductionWireWithXPos(InductionWireHit* w, double x) : iwire(w), xpos(x) {}

    bool
    operator<(const InductionWireWithXPos& w) const
    {
      return xpos < w.xpos;
    }

    InductionWireHit* iwire;
    double xpos;
  };

  class SpacePointSolver : public art::EDProducer {
  public:
    explicit SpacePointSolver(const fhicl::ParameterSet& pset);

  private:
    void produce(art::Event& evt) override;
    void beginJob() override;

    void AddNeighbours(const std::vector<SpaceCharge*>& spaceCharges) const;

    typedef std::map<const WireHit*, const recob::Hit*> HitMap_t;

    void BuildSystem(const std::vector<HitTriplet>& triplets,
                     std::vector<CollectionWireHit*>& cwires,
                     std::vector<InductionWireHit*>& iwires,
                     std::vector<SpaceCharge*>& orphanSCs,
                     bool incNei,
                     HitMap_t& hitmap) const;

    void Minimize(const std::vector<CollectionWireHit*>& cwires,
                  const std::vector<SpaceCharge*>& orphanSCs,
                  double alpha,
                  int maxiterations);

    /// return whether the point was inserted (only happens when it has charge)
    bool AddSpacePoint(const SpaceCharge& sc,
                       int id,
                       recob::ChargedSpacePointCollectionCreator& points) const;

    void FillSystemToSpacePoints(const std::vector<CollectionWireHit*>& cwires,
                                 const std::vector<SpaceCharge*>& orphanSCs,
                                 recob::ChargedSpacePointCollectionCreator& pts) const;

    void FillSystemToSpacePointsAndAssns(const std::vector<art::Ptr<recob::Hit>>& hitlist,
                                         const std::vector<CollectionWireHit*>& cwires,
                                         const std::vector<SpaceCharge*>& orphanSCs,
                                         const HitMap_t& hitmap,
                                         recob::ChargedSpacePointCollectionCreator& points,
                                         art::Assns<recob::SpacePoint, recob::Hit>& assn) const;

    std::string fHitLabel;

    bool fFit;
    bool fAllowBadInductionHit, fAllowBadCollectionHit;

    double fAlpha;

    double fDistThresh;
    double fDistThreshDrift;

    int fMaxIterationsNoReg;
    int fMaxIterationsReg;

    double fXHitOffset;

    const geo::GeometryCore* geom;
    std::unique_ptr<reco3d::IHitReader> fHitReader; ///<  Expt specific tool for reading hits
  };

  DEFINE_ART_MODULE(SpacePointSolver)

  // ---------------------------------------------------------------------------
  SpacePointSolver::SpacePointSolver(const fhicl::ParameterSet& pset)
    : EDProducer{pset}
    , fHitLabel(pset.get<std::string>("HitLabel"))
    , fFit(pset.get<bool>("Fit"))
    , fAllowBadInductionHit(pset.get<bool>("AllowBadInductionHit"))
    , fAllowBadCollectionHit(pset.get<bool>("AllowBadCollectionHit"))
    , fAlpha(pset.get<double>("Alpha"))
    , fDistThresh(pset.get<double>("WireIntersectThreshold"))
    , fDistThreshDrift(pset.get<double>("WireIntersectThresholdDriftDir"))
    , fMaxIterationsNoReg(pset.get<int>("MaxIterationsNoReg"))
    , fMaxIterationsReg(pset.get<int>("MaxIterationsReg"))
    , fXHitOffset(pset.get<double>("XHitOffset"))
  {
    recob::ChargedSpacePointCollectionCreator::produces(producesCollector(), "pre");
    if (fFit) {
      recob::ChargedSpacePointCollectionCreator::produces(producesCollector());
      produces<art::Assns<recob::SpacePoint, recob::Hit>>();
      recob::ChargedSpacePointCollectionCreator::produces(producesCollector(), "noreg");
    }

    fHitReader = art::make_tool<reco3d::IHitReader>(pset.get<fhicl::ParameterSet>("HitReaderTool"));
  }

  // ---------------------------------------------------------------------------
  void
  SpacePointSolver::beginJob()
  {
    geom = art::ServiceHandle<geo::Geometry const>()->provider();
  }

  // ---------------------------------------------------------------------------
  void
  SpacePointSolver::AddNeighbours(const std::vector<SpaceCharge*>& spaceCharges) const
  {
    static const double kCritDist = 5;

    // Could use a QuadTree or VPTree etc, but seems like overkill
    class IntCoord {
    public:
      IntCoord(const SpaceCharge& sc)
        : fX(sc.fX / kCritDist), fY(sc.fY / kCritDist), fZ(sc.fZ / kCritDist)
      {}

      bool
      operator<(const IntCoord& i) const
      {
        return std::make_tuple(fX, fY, fZ) < std::make_tuple(i.fX, i.fY, i.fZ);
      }

      std::vector<IntCoord>
      Neighbours() const
      {
        std::vector<IntCoord> ret;
        for (int dx = -1; dx <= +1; ++dx) {
          for (int dy = -1; dy <= +1; ++dy) {
            for (int dz = -1; dz <= +1; ++dz) {
              ret.push_back(IntCoord(fX + dx, fY + dy, fZ + dz));
            }
          }
        }
        return ret;
      }

    protected:
      IntCoord(int x, int y, int z) : fX(x), fY(y), fZ(z) {}

      int fX, fY, fZ;
    };

    std::map<IntCoord, std::vector<SpaceCharge*>> scMap;
    for (SpaceCharge* sc : spaceCharges) {
      scMap[IntCoord(*sc)].push_back(sc);
    }

    std::cout << "Neighbour search..." << std::endl;

    // Now that we know all the space charges, can go through and assign neighbours

    int Ntests = 0;
    int Nnei = 0;
    for (SpaceCharge* sc1 : spaceCharges) {
      IntCoord ic(*sc1);
      for (IntCoord icn : ic.Neighbours()) {
        for (SpaceCharge* sc2 : scMap[icn]) {

          ++Ntests;

          if (sc1 == sc2) continue;
          double dist2 =
            cet::sum_of_squares(sc1->fX - sc2->fX, sc1->fY - sc2->fY, sc1->fZ - sc2->fZ);

          if (dist2 > cet::square(kCritDist)) continue;

          if (dist2 == 0) {
            std::cout << "ZERO DISTANCE SOMEHOW?" << std::endl;
            std::cout << sc1->fCWire << " " << sc1->fWire1 << " " << sc1->fWire2 << std::endl;
            std::cout << sc2->fCWire << " " << sc2->fWire1 << " " << sc2->fWire2 << std::endl;
            std::cout << dist2 << " " << sc1->fX << " " << sc2->fX << " " << sc1->fY << " "
                      << sc2->fY << " " << sc1->fZ << " " << sc2->fZ << std::endl;
            continue;
            dist2 = cet::square(kCritDist);
          }

          ++Nnei;

          // This is a pretty random guess
          const double coupling = exp(-sqrt(dist2) / 2);
          sc1->fNeighbours.emplace_back(sc2, coupling);

          if (isnan(1 / sqrt(dist2)) || isinf(1 / sqrt(dist2))) {
            std::cout << dist2 << " " << sc1->fX << " " << sc2->fX << " " << sc1->fY << " "
                      << sc2->fY << " " << sc1->fZ << " " << sc2->fZ << std::endl;
            abort();
          }
        } // end for sc2
      }   // end for icn

      // The neighbours lists use the most memory, so be careful to trim
      sc1->fNeighbours.shrink_to_fit();
    } // end for sc1

    for (SpaceCharge* sc : spaceCharges) {
      for (Neighbour& nei : sc->fNeighbours) {
        sc->fNeiPotential += nei.fCoupling * nei.fSC->fPred;
      }
    }

    std::cout << Ntests << " tests to find " << Nnei << " neighbours" << std::endl;
  }

  // ---------------------------------------------------------------------------
  void
  SpacePointSolver::BuildSystem(const std::vector<HitTriplet>& triplets,
                                std::vector<CollectionWireHit*>& cwires,
                                std::vector<InductionWireHit*>& iwires,
                                std::vector<SpaceCharge*>& orphanSCs,
                                bool incNei,
                                HitMap_t& hitmap) const
  {
    std::set<const recob::Hit*> ihits;
    std::set<const recob::Hit*> chits;
    for (const HitTriplet& trip : triplets) {
      if (trip.x) chits.insert(trip.x);
      if (trip.u) ihits.insert(trip.u);
      if (trip.v) ihits.insert(trip.v);
    }

    std::map<const recob::Hit*, InductionWireHit*> inductionMap;
    for (const recob::Hit* hit : ihits) {
      InductionWireHit* iwire = new InductionWireHit(hit->Channel(), hit->Integral());
      inductionMap[hit] = iwire;
      iwires.emplace_back(iwire);
      hitmap[iwire] = hit;
    }

    std::map<const recob::Hit*, std::vector<SpaceCharge*>> collectionMap;
    std::map<const recob::Hit*, std::vector<SpaceCharge*>> collectionMapBad;

    std::set<InductionWireHit*> satisfiedInduction;

    for (const HitTriplet& trip : triplets) {
      // Don't have a cwire object yet, set it later
      SpaceCharge* sc = new SpaceCharge(
        trip.pt.x, trip.pt.y, trip.pt.z, 0, inductionMap[trip.u], inductionMap[trip.v]);

      if (trip.u && trip.v) {
        collectionMap[trip.x].push_back(sc);
        if (trip.x) {
          satisfiedInduction.insert(inductionMap[trip.u]);
          satisfiedInduction.insert(inductionMap[trip.v]);
        }
      }
      else {
        collectionMapBad[trip.x].push_back(sc);
      }
    }

    std::vector<SpaceCharge*> spaceCharges;

    for (const recob::Hit* hit : chits) {
      // Find the space charges associated with this hit
      std::vector<SpaceCharge*>& scs = collectionMap[hit];
      if (scs.empty()) {
        // If there are no full triplets try the triplets with one bad channel
        scs = collectionMapBad[hit];
      }
      else {
        // If there were good triplets, delete the bad hit ones
        for (SpaceCharge* sc : collectionMapBad[hit])
          delete sc;
      }
      // Still no space points, don't bother making a wire
      if (scs.empty()) continue;

      CollectionWireHit* cwire = new CollectionWireHit(hit->Channel(), hit->Integral(), scs);
      hitmap[cwire] = hit;
      cwires.push_back(cwire);
      spaceCharges.insert(spaceCharges.end(), scs.begin(), scs.end());
      for (SpaceCharge* sc : scs)
        sc->fCWire = cwire;
    } // end for hit

    // Space charges whose collection wire is bad, which we have no other way of
    // addressing.
    for (SpaceCharge* sc : collectionMap[0]) {
      // Only count orphans where an induction wire has no other explanation
      if (satisfiedInduction.count(sc->fWire1) == 0 || satisfiedInduction.count(sc->fWire2) == 0) {
        orphanSCs.push_back(sc);
      }
      else {
        delete sc;
      }
    }
    spaceCharges.insert(spaceCharges.end(), orphanSCs.begin(), orphanSCs.end());

    std::cout << cwires.size() << " collection wire objects" << std::endl;
    std::cout << spaceCharges.size() << " potential space points" << std::endl;

    if (incNei) AddNeighbours(spaceCharges);
  }

  // ---------------------------------------------------------------------------
  bool
  SpacePointSolver::AddSpacePoint(const SpaceCharge& sc,
                                  int id,
                                  recob::ChargedSpacePointCollectionCreator& points) const
  {
    static const double err[6] = {
      0,
    };

    const float charge = sc.fPred;
    if (charge == 0) return false;

    const double xyz[3] = {sc.fX, sc.fY, sc.fZ};
    points.add({xyz, err, 0.0, id}, charge);

    return true;
  }

  // ---------------------------------------------------------------------------
  void
  SpacePointSolver::FillSystemToSpacePoints(const std::vector<CollectionWireHit*>& cwires,
                                            const std::vector<SpaceCharge*>& orphanSCs,
                                            recob::ChargedSpacePointCollectionCreator& points) const
  {
    int iPoint = 0;
    for (const CollectionWireHit* cwire : cwires) {
      for (const SpaceCharge* sc : cwire->fCrossings) {
        AddSpacePoint(*sc, iPoint++, points);
      } // for sc
    }   // for cwire

    for (const SpaceCharge* sc : orphanSCs)
      AddSpacePoint(*sc, iPoint++, points);
  }

  // ---------------------------------------------------------------------------
  void
  SpacePointSolver::FillSystemToSpacePointsAndAssns(
    const std::vector<art::Ptr<recob::Hit>>& hitlist,
    const std::vector<CollectionWireHit*>& cwires,
    const std::vector<SpaceCharge*>& orphanSCs,
    const HitMap_t& hitmap,
    recob::ChargedSpacePointCollectionCreator& points,
    art::Assns<recob::SpacePoint, recob::Hit>& assn) const
  {
    std::map<const recob::Hit*, art::Ptr<recob::Hit>> ptrmap;
    for (art::Ptr<recob::Hit> hit : hitlist)
      ptrmap[hit.get()] = hit;

    std::vector<const SpaceCharge*> scs;
    for (const SpaceCharge* sc : orphanSCs)
      scs.push_back(sc);
    for (const CollectionWireHit* cwire : cwires)
      for (const SpaceCharge* sc : cwire->fCrossings)
        scs.push_back(sc);

    int iPoint = 0;

    for (const SpaceCharge* sc : scs) {
      if (!AddSpacePoint(*sc, iPoint++, points)) continue;
      const auto& spsPtr = points.lastSpacePointPtr();

      if (sc->fCWire) { assn.addSingle(spsPtr, ptrmap[hitmap.at(sc->fCWire)]); }
      if (sc->fWire1) { assn.addSingle(spsPtr, ptrmap[hitmap.at(sc->fWire1)]); }
      if (sc->fWire2) { assn.addSingle(spsPtr, ptrmap[hitmap.at(sc->fWire2)]); }
    }
  }

  // ---------------------------------------------------------------------------
  void
  SpacePointSolver::Minimize(const std::vector<CollectionWireHit*>& cwires,
                             const std::vector<SpaceCharge*>& orphanSCs,
                             double alpha,
                             int maxiterations)
  {
    double prevMetric = Metric(cwires, alpha);
    std::cout << "Begin: " << prevMetric << std::endl;
    for (int i = 0; i < maxiterations; ++i) {
      Iterate(cwires, orphanSCs, alpha);
      const double metric = Metric(cwires, alpha);
      std::cout << i << " " << metric << std::endl;
      if (metric > prevMetric) {
        std::cout << "Warning: metric increased" << std::endl;
        return;
      }
      if (fabs(metric - prevMetric) < 1e-3 * fabs(prevMetric)) return;
      prevMetric = metric;
    }
  }

  // ---------------------------------------------------------------------------
  void
  SpacePointSolver::produce(art::Event& evt)
  {
    art::Handle<std::vector<recob::Hit>> hits;
    std::vector<art::Ptr<recob::Hit>> hitlist;
    if (evt.getByLabel(fHitLabel, hits)) art::fill_ptr_vector(hitlist, hits);

    auto spcol_pre = recob::ChargedSpacePointCollectionCreator::forPtrs(evt, "pre");
    auto spcol_noreg = recob::ChargedSpacePointCollectionCreator::forPtrs(evt, "noreg");
    auto spcol = recob::ChargedSpacePointCollectionCreator::forPtrs(evt);
    auto assns = std::make_unique<art::Assns<recob::SpacePoint, recob::Hit>>();

    // Skip very small events
    if (hits->size() < 20) {
      spcol_pre.put();
      if (fFit) {
        spcol.put();
        evt.put(std::move(assns));
        spcol_noreg.put();
      }
      return;
    }

    art::ServiceHandle<geo::Geometry const> geom;

    std::vector<art::Ptr<recob::Hit>> xhits, uhits, vhits;
    bool is2view = fHitReader->readHits(hitlist, xhits, uhits, vhits);

    std::vector<raw::ChannelID_t> xbadchans, ubadchans, vbadchans;
    if (fAllowBadInductionHit || fAllowBadCollectionHit) {
      for (raw::ChannelID_t cid :
           art::ServiceHandle<lariov::ChannelStatusService const>()->GetProvider().BadChannels()) {
        if (geom->SignalType(cid) == geo::kCollection) {
          if (fAllowBadCollectionHit && geom->View(cid) == geo::kZ) { xbadchans.push_back(cid); }
        }
        else {
          if (fAllowBadInductionHit) {
            if (geom->View(cid) == geo::kU) ubadchans.push_back(cid);
            if (geom->View(cid) == geo::kV) vbadchans.push_back(cid);
          }
        }
      }
    }
    std::cout << xbadchans.size() << " X, " << ubadchans.size() << " U, " << vbadchans.size()
              << " V bad channels" << std::endl;

    std::vector<CollectionWireHit*> cwires;
    // So we can find them all to free the memory
    std::vector<InductionWireHit*> iwires;
    // Nodes with a bad collection wire that we otherwise can't address
    std::vector<SpaceCharge*> orphanSCs;

    auto const detProp =
      art::ServiceHandle<detinfo::DetectorPropertiesService const>()->DataFor(evt);

    HitMap_t hitmap;
    if (is2view) {
      std::cout << "Finding 2-view coincidences..." << std::endl;
      TripletFinder tf(detProp,
                       xhits,
                       uhits,
                       {},
                       xbadchans,
                       ubadchans,
                       {},
                       fDistThresh,
                       fDistThreshDrift,
                       fXHitOffset);
      BuildSystem(tf.TripletsTwoView(), cwires, iwires, orphanSCs, fAlpha != 0, hitmap);
    }
    else {
      std::cout << "Finding XUV coincidences..." << std::endl;
      TripletFinder tf(detProp,
                       xhits,
                       uhits,
                       vhits,
                       xbadchans,
                       ubadchans,
                       vbadchans,
                       fDistThresh,
                       fDistThreshDrift,
                       fXHitOffset);
      BuildSystem(tf.Triplets(), cwires, iwires, orphanSCs, fAlpha != 0, hitmap);
    }

    FillSystemToSpacePoints(cwires, orphanSCs, spcol_pre);
    spcol_pre.put();

    if (fFit) {
      std::cout << "Iterating with no regularization..." << std::endl;
      Minimize(cwires, orphanSCs, 0, fMaxIterationsNoReg);

      FillSystemToSpacePoints(cwires, orphanSCs, spcol_noreg);
      spcol_noreg.put();

      std::cout << "Now with regularization..." << std::endl;
      Minimize(cwires, orphanSCs, fAlpha, fMaxIterationsReg);

      FillSystemToSpacePointsAndAssns(hitlist, cwires, orphanSCs, hitmap, spcol, *assns);
      spcol.put();
      evt.put(std::move(assns));
    } // end if fFit

    for (InductionWireHit* i : iwires)
      delete i;
    for (CollectionWireHit* c : cwires)
      delete c;
    for (SpaceCharge* s : orphanSCs)
      delete s;
  }

} // end namespace reco3d