PileUp.cc

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#include "Mixing/Base/interface/PileUp.h"
#include "DataFormats/Provenance/interface/BranchIDListHelper.h"
#include "DataFormats/Provenance/interface/ModuleDescription.h"
#include "DataFormats/Provenance/interface/ThinnedAssociationsHelper.h"
#include "FWCore/Framework/interface/EventPrincipal.h"
#include "FWCore/Framework/src/SignallingProductRegistry.h"
#include "FWCore/ServiceRegistry/interface/ActivityRegistry.h"
#include "FWCore/ServiceRegistry/interface/ProcessContext.h"
#include "FWCore/Sources/interface/VectorInputSourceDescription.h"
#include "FWCore/Sources/interface/VectorInputSourceFactory.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/Utilities/interface/Exception.h"
#include "FWCore/Utilities/interface/GetPassID.h"
#include "FWCore/Utilities/interface/StreamID.h"
#include "FWCore/Version/interface/GetReleaseVersion.h"

#include "FWCore/ServiceRegistry/interface/Service.h"
#include "FWCore/Utilities/interface/RandomNumberGenerator.h"

#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "Mixing/Base/src/SecondaryEventProvider.h"
#include "CondFormats/DataRecord/interface/MixingRcd.h"
#include "CondFormats/RunInfo/interface/MixingModuleConfig.h"

#include "CLHEP/Random/RandPoissonQ.h"
#include "CLHEP/Random/RandPoisson.h"

#include <algorithm>
#include <memory>
#include "TMath.h"

/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

static Double_t GetRandom(TH1* th1, CLHEP::HepRandomEngine* rng)
{
   Int_t nbinsx = th1->GetNbinsX();
   Double_t* fIntegral = th1->GetIntegral();
   Double_t integral = fIntegral[nbinsx];

   if (integral == 0) return 0;

   Double_t r1 = rng->flat();
   Int_t ibin = TMath::BinarySearch(nbinsx,fIntegral,r1);
   Double_t x = th1->GetBinLowEdge(ibin+1);
   if (r1 > fIntegral[ibin])
      x += th1->GetBinWidth(ibin+1)*(r1-fIntegral[ibin])/(fIntegral[ibin+1] - fIntegral[ibin]);
   return x;
}

namespace edm {
  PileUp::PileUp(ParameterSet const& pset, const std::shared_ptr<PileUpConfig>& config) :
    type_(pset.getParameter<std::string>("type")),
    Source_type_(config->sourcename_),
    averageNumber_(config->averageNumber_),
    intAverage_(static_cast<int>(averageNumber_)),
    histo_(config->histo_),
    histoDistribution_(type_ == "histo"),
    probFunctionDistribution_(type_ == "probFunction"),
    poisson_(type_ == "poisson"),
    fixed_(type_ == "fixed"),
    none_(type_ == "none"),
    fileNameHash_(0U),
    productRegistry_(new SignallingProductRegistry),
    input_(VectorInputSourceFactory::get()->makeVectorInputSource(pset, VectorInputSourceDescription(
                                                                   productRegistry_, edm::PreallocationConfiguration())).release()),
    processConfiguration_(new ProcessConfiguration(std::string("@MIXING"), getReleaseVersion(), getPassID())),
    processContext_(new ProcessContext()),
    eventPrincipal_(),
    lumiPrincipal_(),
    runPrincipal_(),
    provider_(),
    PoissonDistribution_(),
    PoissonDistr_OOT_(),
    randomEngine_(),
    playback_(config->playback_),
    sequential_(pset.getUntrackedParameter<bool>("sequential", false)) {

    // Use the empty parameter set for the parameter set ID of our "@MIXING" process.
    processConfiguration_->setParameterSetID(ParameterSet::emptyParameterSetID());
    processContext_->setProcessConfiguration(processConfiguration_.get());

    if(pset.existsAs<std::vector<ParameterSet> >("producers", true)) {
      std::vector<ParameterSet> producers = pset.getParameter<std::vector<ParameterSet> >("producers");
      provider_.reset(new SecondaryEventProvider(producers, *productRegistry_, processConfiguration_));
    }

    productRegistry_->setFrozen();

    // A modified HistoryAppender must be used for unscheduled processing.
    eventPrincipal_.reset(new EventPrincipal(input_->productRegistry(),
                                       std::make_shared<BranchIDListHelper>(),
                                       std::make_shared<ThinnedAssociationsHelper>(),
                                       *processConfiguration_,
                                       nullptr));

    bool DB=type_=="readDB";

    if (pset.exists("nbPileupEvents")) {
       if (0 != pset.getParameter<edm::ParameterSet>("nbPileupEvents").getUntrackedParameter<int>("seed",0)) {
         edm::LogWarning("MixingModule") << "Parameter nbPileupEvents.seed is not supported";
       }
    }

    edm::Service<edm::RandomNumberGenerator> rng;
    if (!rng.isAvailable()) {
      throw cms::Exception("Configuration")
    << "PileUp requires the RandomNumberGeneratorService\n"
    "which is not present in the configuration file.  You must add the service\n"
    "in the configuration file or remove the modules that require it.";
    }

    if (!(histoDistribution_ || probFunctionDistribution_ || poisson_ || fixed_ || none_) && !DB) {
      throw cms::Exception("Illegal parameter value","PileUp::PileUp(ParameterSet const& pset)")
        << "'type' parameter (a string) has a value of '" << type_ << "'.\n"
        << "Legal values are 'poisson', 'fixed', or 'none'\n";
    }

    if (!DB){
      manage_OOT_ = pset.getUntrackedParameter<bool>("manage_OOT", false);

      // Check for string describing special processing.  Add these here for individual cases
      PU_Study_ = false;
      Study_type_ = pset.getUntrackedParameter<std::string>("Special_Pileup_Studies", "");

      if(Study_type_ == "Fixed_ITPU_Vary_OOTPU") {
        PU_Study_ = true;
        intFixed_ITPU_ = pset.getUntrackedParameter<int>("intFixed_ITPU", 0);
      }

      if(manage_OOT_) { // figure out what the parameters are

        //      if (playback_) throw cms::Exception("Illegal parameter clash","PileUp::PileUp(ParameterSet const& pset)")
        // << " manage_OOT option not allowed with playback ";

        std::string OOT_type = pset.getUntrackedParameter<std::string>("OOT_type");

        if(OOT_type == "Poisson" || OOT_type == "poisson") {
      poisson_OOT_ = true;
        }
        else if(OOT_type == "Fixed" || OOT_type == "fixed") {
      fixed_OOT_ = true;
      // read back the fixed number requested out-of-time
          intFixed_OOT_ = pset.getUntrackedParameter<int>("intFixed_OOT", -1);
          if(intFixed_OOT_ < 0) {
        throw cms::Exception("Illegal parameter value","PileUp::PileUp(ParameterSet const& pset)")
          << " Fixed out-of-time pileup requested, but no fixed value given ";
       }
        } else {
      throw cms::Exception("Illegal parameter value","PileUp::PileUp(ParameterSet const& pset)")
        << "'OOT_type' parameter (a string) has a value of '" << OOT_type << "'.\n"
        << "Legal values are 'poisson' or 'fixed'\n";
        }
        edm::LogInfo("MixingModule") <<" Out-of-time pileup will be generated with a " << OOT_type << " distribution. " ;
      }
    }

    if(Source_type_ == "cosmics") {  // allow for some extra flexibility for mixing
      minBunch_cosmics_ = pset.getUntrackedParameter<int>("minBunch_cosmics", -1000);
      maxBunch_cosmics_ = pset.getUntrackedParameter<int>("maxBunch_cosmics", 1000);
    }
  } // end of constructor

  void PileUp::beginStream (edm::StreamID) {
    auto iID = eventPrincipal_->streamID(); // each producer has its own workermanager, so use default streamid
    streamContext_.reset(new StreamContext(iID, processContext_.get()));
    input_->doBeginJob();
    if (provider_.get() != nullptr) {
      provider_->beginJob(*productRegistry_);
      provider_->beginStream(iID, *streamContext_);
    }
  }

  void PileUp::endStream () {
    if (provider_.get() != nullptr) {
      provider_->endStream(streamContext_->streamID(), *streamContext_);
      provider_->endJob();
    }
    input_->doEndJob();
  }

  void PileUp::beginRun(const edm::Run& run, const edm::EventSetup& setup) {
    if (provider_.get() != nullptr) {
      auto aux = std::make_shared<RunAuxiliary>(run.runAuxiliary());
      runPrincipal_.reset(new RunPrincipal(aux, productRegistry_, *processConfiguration_, nullptr, 0));
      provider_->beginRun(*runPrincipal_, setup, run.moduleCallingContext(), *streamContext_);
    }
  }
  void PileUp::beginLuminosityBlock(const edm::LuminosityBlock& lumi, const edm::EventSetup& setup) {
    if (provider_.get() != nullptr) {
      auto aux = std::make_shared<LuminosityBlockAuxiliary>(lumi.luminosityBlockAuxiliary());
      lumiPrincipal_.reset(new LuminosityBlockPrincipal(aux, productRegistry_, *processConfiguration_, nullptr, 0));
      lumiPrincipal_->setRunPrincipal(runPrincipal_);
      provider_->beginLuminosityBlock(*lumiPrincipal_, setup, lumi.moduleCallingContext(), *streamContext_);
    }
  }

  void PileUp::endRun(const edm::Run& run, const edm::EventSetup& setup) {
    if (provider_.get() != nullptr) {
      provider_->endRun(*runPrincipal_, setup, run.moduleCallingContext(), *streamContext_);
    }
  }
  void PileUp::endLuminosityBlock(const edm::LuminosityBlock& lumi, const edm::EventSetup& setup) {
    if (provider_.get() != nullptr) {
      provider_->endLuminosityBlock(*lumiPrincipal_, setup, lumi.moduleCallingContext(), *streamContext_);
    }
  }

  void PileUp::setupPileUpEvent(const edm::EventSetup& setup) {
    if (provider_.get() != nullptr) {
      // note:  run and lumi numbers must be modified to match lumiPrincipal_
      eventPrincipal_->setLuminosityBlockPrincipal(lumiPrincipal_);
      eventPrincipal_->setRunAndLumiNumber(lumiPrincipal_->run(), lumiPrincipal_->luminosityBlock());
      provider_->setupPileUpEvent(*eventPrincipal_, setup, *streamContext_);
    }
  }

  void PileUp::reload(const edm::EventSetup & setup){
    //get the required parameters from DB.
    edm::ESHandle<MixingModuleConfig> configM;
    setup.get<MixingRcd>().get(configM);

    const MixingInputConfig & config=configM->config(inputType_);

    //get the type
    type_=config.type();
    //set booleans
    histoDistribution_=type_ == "histo";
    probFunctionDistribution_=type_ == "probFunction";
    poisson_=type_ == "poisson";
    fixed_=type_ == "fixed";
    none_=type_ == "none";

    if (histoDistribution_) edm::LogError("MisConfiguration")<<"type histo cannot be reloaded from DB, yet";

    if (fixed_){
      averageNumber_=averageNumber();
    }
    else if (poisson_)
      {
    averageNumber_=config.averageNumber();
        if(PoissonDistribution_) {
          PoissonDistribution_.reset(new CLHEP::RandPoissonQ(PoissonDistribution_->engine(), averageNumber_));
        }
      }
    else if (probFunctionDistribution_)
      {
    //need to reload the histogram from DB
    const std::vector<int> & dataProbFunctionVar = config.probFunctionVariable();
    std::vector<double> dataProb = config.probValue();

    int varSize = (int) dataProbFunctionVar.size();
    int probSize = (int) dataProb.size();

    if ((dataProbFunctionVar[0] != 0) || (dataProbFunctionVar[varSize - 1] != (varSize - 1)))
      throw cms::Exception("BadProbFunction") << "Please, check the variables of the probability function! The first variable should be 0 and the difference between two variables should be 1." << std::endl;

    // Complete the vector containing the probability  function data
    // with the values "0"
    if (probSize < varSize){
      edm::LogWarning("MixingModule") << " The probability function data will be completed with " <<(varSize - probSize)  <<" values 0.";

      for (int i=0; i<(varSize - probSize); i++) dataProb.push_back(0);

      probSize = dataProb.size();
      edm::LogInfo("MixingModule") << " The number of the P(x) data set after adding the values 0 is " << probSize;
    }

    // Create an histogram with the data from the probability function provided by the user
    int xmin = (int) dataProbFunctionVar[0];
    int xmax = (int) dataProbFunctionVar[varSize-1]+1;  // need upper edge to be one beyond last value
    int numBins = varSize;

    edm::LogInfo("MixingModule") << "An histogram will be created with " << numBins << " bins in the range ("<< xmin << "," << xmax << ")." << std::endl;

    histo_.reset(new TH1F("h","Histo from the user's probability function",numBins,xmin,xmax));

    LogDebug("MixingModule") << "Filling histogram with the following data:" << std::endl;

    for (int j=0; j < numBins ; j++){
      LogDebug("MixingModule") << " x = " << dataProbFunctionVar[j ]<< " P(x) = " << dataProb[j];
      histo_->Fill(dataProbFunctionVar[j]+0.5,dataProb[j]); // assuming integer values for the bins, fill bin centers, not edges
    }

    // Check if the histogram is normalized
    if (std::abs(histo_->Integral() - 1) > 1.0e-02){
      throw cms::Exception("BadProbFunction") << "The probability function should be normalized!!! " << std::endl;
    }
    averageNumber_=histo_->GetMean();
      }

    int oot=config.outOfTime();
    manage_OOT_=false;
    if (oot==1)
      {
    manage_OOT_=true;
    poisson_OOT_ = false;
    fixed_OOT_ = true;
    intFixed_OOT_=config.fixedOutOfTime();
      }
    else if (oot==2)
      {
    manage_OOT_=true;
    poisson_OOT_ = true;
    fixed_OOT_ = false;
      }


  }
  PileUp::~PileUp() {
  }

  std::unique_ptr<CLHEP::RandPoissonQ> const& PileUp::poissonDistribution(StreamID const& streamID) {
    if(!PoissonDistribution_) {
      CLHEP::HepRandomEngine& engine = *randomEngine(streamID);
      PoissonDistribution_.reset(new CLHEP::RandPoissonQ(engine, averageNumber_));
    }
    return PoissonDistribution_;
  }

  std::unique_ptr<CLHEP::RandPoisson> const& PileUp::poissonDistr_OOT(StreamID const& streamID) {
    if(!PoissonDistr_OOT_) {
      CLHEP::HepRandomEngine& engine = *randomEngine(streamID);
      PoissonDistr_OOT_.reset(new CLHEP::RandPoisson(engine));
    }
    return PoissonDistr_OOT_;
  }

  CLHEP::HepRandomEngine* PileUp::randomEngine(StreamID const& streamID) {
    if(!randomEngine_) {
      Service<RandomNumberGenerator> rng;
      randomEngine_ = &rng->getEngine(streamID);
    }
    return randomEngine_;
  }

  void PileUp::CalculatePileup(int MinBunch, int MaxBunch, std::vector<int>& PileupSelection, std::vector<float>& TrueNumInteractions, StreamID const& streamID) {

    // if we are managing the distribution of out-of-time pileup separately, select the distribution for bunch
    // crossing zero first, save it for later.

    int nzero_crossing = -1;
    double Fnzero_crossing = -1;

    if(manage_OOT_) {
      if (none_){
    nzero_crossing = 0;
      }else if (poisson_){
    nzero_crossing =  poissonDistribution(streamID)->fire() ;
      }else if (fixed_){
    nzero_crossing =  intAverage_ ;
      }else if (histoDistribution_ || probFunctionDistribution_){
        // RANDOM_NUMBER_ERROR
        // Random number should be generated by the engines from the
        // RandomNumberGeneratorService. This appears to use the global
        // engine in ROOT. This is not thread safe unless the module using
        // it is a one module and declares a shared resource and all
        // other modules using it also declare the same shared resource.
        // This also breaks replay.
    double d = GetRandom(histo_.get(), randomEngine(streamID));
    //n = (int) floor(d + 0.5);  // incorrect for bins with integer edges
    Fnzero_crossing =  d;
    nzero_crossing = int(d);
      }

    }

    for(int bx = MinBunch; bx < MaxBunch+1; ++bx) {

      if(manage_OOT_) {
    if(bx==0 && !poisson_OOT_) {
      PileupSelection.push_back(nzero_crossing) ;
      TrueNumInteractions.push_back( nzero_crossing );
    }
    else{
      if(poisson_OOT_) {
        if(PU_Study_ && (Study_type_ == "Fixed_ITPU_Vary_OOTPU" ) && bx==0 ) {
          PileupSelection.push_back(intFixed_ITPU_) ;
        }
        else{
          PileupSelection.push_back(poissonDistr_OOT(streamID)->fire(Fnzero_crossing)) ;
        }
        TrueNumInteractions.push_back( Fnzero_crossing );
      }
      else {
        PileupSelection.push_back(intFixed_OOT_) ;
        TrueNumInteractions.push_back( intFixed_OOT_ );
      }
    }
      }
      else {
    if (none_){
      PileupSelection.push_back(0);
      TrueNumInteractions.push_back( 0. );
    }else if (poisson_){
      PileupSelection.push_back(poissonDistribution(streamID)->fire());
      TrueNumInteractions.push_back( averageNumber_ );
    }else if (fixed_){
      PileupSelection.push_back(intAverage_);
      TrueNumInteractions.push_back( intAverage_ );
    }else if (histoDistribution_ || probFunctionDistribution_){
          // RANDOM_NUMBER_ERROR
          // Random number should be generated by the engines from the
          // RandomNumberGeneratorService. This appears to use the global
          // engine in ROOT. This is not thread safe unless the module using
          // it is a one module and declares a shared resource and all
          // other modules using it also declare the same shared resource.
          // This also breaks replay.
      double d = GetRandom(histo_.get(), randomEngine(streamID));
      PileupSelection.push_back(int(d));
      TrueNumInteractions.push_back( d );
    }
      }

    }
  }


} //namespace edm