RooProdGenContext.cxx

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/*****************************************************************************
 * Project: RooFit                                                           *
 * Package: RooFitCore                                                       *
 * @(#)root/roofitcore:$Id$
 * Authors:                                                                  *
 *   WV, Wouter Verkerke, UC Santa Barbara, verkerke@slac.stanford.edu       *
 *   DK, David Kirkby,    UC Irvine,         dkirkby@uci.edu                 *
 *                                                                           *
 * Copyright (c) 2000-2005, Regents of the University of California          *
 *                          and Stanford University. All rights reserved.    *
 *                                                                           *
 * Redistribution and use in source and binary forms,                        *
 * with or without modification, are permitted according to the terms        *
 * listed in LICENSE (http://roofit.sourceforge.net/license.txt)             *
 *****************************************************************************/
 
/**
\file RooProdGenContext.cxx
\class RooProdGenContext
\ingroup Roofitcore
 
Efficient implementation of the generator context
specific for RooProdPdf PDFs. The sim-context owns a list of
component generator contexts that are used to generate the dependents
for each component PDF sequentially.
**/
 
#include "RooMsgService.h"
#include "RooProdGenContext.h"
#include "RooProdPdf.h"
#include "RooDataSet.h"
#include "RooRealVar.h"
#include "RooGlobalFunc.h"
 
#include <ostream>
 
using std::endl, std::ostream;
 
 
 
////////////////////////////////////////////////////////////////////////////////
 
RooProdGenContext::RooProdGenContext(const RooProdPdf &model, const RooArgSet &vars,
                 const RooDataSet *prototype, const RooArgSet* auxProto, bool verbose) :
  RooAbsGenContext(model,vars,prototype,auxProto,verbose), _pdf(&model)
{
  // Constructor of optimization generator context for RooProdPdf objects
 
  //Build an array of generator contexts for each product component PDF
  cxcoutI(Generation) << "RooProdGenContext::ctor() setting up event special generator context for product p.d.f. " << model.GetName()
         << " for generation of observable(s) " << vars ;
  if (prototype) ccxcoutI(Generation) << " with prototype data for " << *prototype->get() ;
  if (auxProto && !auxProto->empty())  ccxcoutI(Generation) << " with auxiliary prototypes " << *auxProto ;
  ccxcoutI(Generation) << std::endl ;
 
  // Make full list of dependents (generated & proto)
  RooArgSet deps(vars) ;
  if (prototype) {
    deps.remove(*std::unique_ptr<RooArgSet>{model.getObservables(*prototype->get())},true,true) ;
  }
 
  // Factorize product in irreducible terms
  RooProdPdf::Factorized factorized;
  model.factorizeProduct(deps,RooArgSet(),factorized);
 
  if (dologD(Generation)) {
    cxcoutD(Generation) << "RooProdGenContext::ctor() factorizing product expression in irriducible terms " ;
    for(auto * t : static_range_cast<RooArgSet*>(factorized.terms)) {
      ccxcoutD(Generation) << *t ;
    }
    ccxcoutD(Generation) << std::endl;
  }
 
  RooArgSet genDeps ;
  // First add terms that do not import observables
 
  bool anyAction = true ;
  bool go=true ;
  while(go) {
 
    auto termIter = factorized.terms.begin();
    auto impIter = factorized.imps.begin();
    auto normIter = factorized.norms.begin();
 
    bool anyPrevAction=anyAction ;
    anyAction=false ;
 
    if (factorized.terms.empty()) {
      break ;
    }
 
    while(termIter != factorized.terms.end()) {
 
      auto * term = static_cast<RooArgSet*>(*termIter);
      auto * impDeps = static_cast<RooArgSet*>(*impIter);
      auto * termDeps = static_cast<RooArgSet*>(*normIter);
      if (impDeps==nullptr || termDeps==nullptr) {
   break ;
      }
 
      cxcoutD(Generation) << "RooProdGenContext::ctor() analyzing product term " << *term << " with observable(s) " << *termDeps ;
      if (!impDeps->empty()) {
   ccxcoutD(Generation) << " which has dependence of external observable(s) " << *impDeps << " that to be generated first by other terms" ;
      }
      ccxcoutD(Generation) << std::endl;
 
      // Add this term if we have no imported dependents, or imported dependents are already generated
      RooArgSet neededDeps(*impDeps) ;
      neededDeps.remove(genDeps,true,true) ;
 
      if (!neededDeps.empty()) {
   if (!anyPrevAction) {
     cxcoutD(Generation) << "RooProdGenContext::ctor() no convergence in single term analysis loop, terminating loop and process remainder of terms as single unit " << std::endl ;
     go=false ;
     break ;
   }
   cxcoutD(Generation) << "RooProdGenContext::ctor() skipping this term for now because it needs imported dependents that are not generated yet" << std::endl ;
   ++termIter;
   ++impIter;
   ++normIter;
   continue ;
      }
 
      // Check if this component has any dependents that need to be generated
      // e.g. it can happen that there are none if all dependents of this component are prototyped
      if (termDeps->empty()) {
   cxcoutD(Generation) << "RooProdGenContext::ctor() term has no observables requested to be generated, removing it" << std::endl ;
 
   // Increment the iterators first, because Removing the corresponding element
   // would invalidate them otherwise.
   ++termIter;
   ++normIter;
   ++impIter;
   factorized.terms.Remove(term);
   factorized.norms.Remove(termDeps);
   factorized.imps.Remove(impDeps);
 
   delete term ;
   delete termDeps ;
   delete impDeps ;
   anyAction=true ;
   continue ;
      }
 
      if (term->size()==1) {
   // Simple term
 
   auto pdf = static_cast<RooAbsPdf*>((*term)[0]);
   std::unique_ptr<RooArgSet> pdfDep{pdf->getObservables(termDeps)};
   if (!pdfDep->empty()) {
     coutI(Generation) << "RooProdGenContext::ctor() creating subcontext for generation of observables " << *pdfDep << " from model " << pdf->GetName() << std::endl ;
     std::unique_ptr<RooArgSet> auxProto2{pdf->getObservables(impDeps)};
     _gcList.emplace_back(pdf->genContext(*pdfDep,prototype,auxProto2.get(),verbose)) ;
   }
 
//    std::cout << "adding following dependents to list of generated observables: " ; pdfDep->Print("1") ;
   genDeps.add(*pdfDep) ;
 
      } else {
 
   // Composite term
   if (!termDeps->empty()) {
     const std::string name = model.makeRGPPName("PRODGEN_",*term,RooArgSet(),RooArgSet(),nullptr) ;
 
     // Construct auxiliary PDF expressing product of composite terms,
     // following Conditional component specification of input model
     RooLinkedList cmdList ;
     RooLinkedList pdfSetList ;
     RooArgSet fullPdfSet ;
     for(auto * pdf : static_range_cast<RooAbsPdf*>(*term)) {
 
       RooArgSet* pdfnset = model.findPdfNSet(*pdf) ;
       RooArgSet* pdfSet = new RooArgSet(*pdf) ;
       pdfSetList.Add(pdfSet) ;
 
       if (pdfnset && !pdfnset->empty()) {
         // This PDF requires a Conditional() construction
         cmdList.Add(RooFit::Conditional(*pdfSet,*pdfnset).Clone()) ;
//          std::cout << "Conditional " << pdf->GetName() << " " ; pdfnset->Print("1") ;
       } else {
         fullPdfSet.add(*pdfSet) ;
       }
 
     }
     auto multiPdf = std::make_unique<RooProdPdf>(name.c_str(),name.c_str(),fullPdfSet,cmdList) ;
     cmdList.Delete() ;
     pdfSetList.Delete() ;
 
     multiPdf->setOperMode(RooAbsArg::ADirty,true) ;
     multiPdf->useDefaultGen(true) ;
 
        coutI(Generation) << "RooProdGenContext()::ctor creating subcontext for generation of observables " << *termDeps
               << "for irriducuble composite term using sub-product object " << multiPdf->GetName() ;
     _gcList.emplace_back(multiPdf->genContext(*termDeps,prototype,auxProto,verbose));
     _ownedMultiProds.addOwned(std::move(multiPdf));
 
     genDeps.add(*termDeps) ;
 
   }
      }
 
      // Increment the iterators first, because Removing the corresponding
      // element would invalidate them otherwise.
      ++termIter;
      ++normIter;
      ++impIter;
      factorized.terms.Remove(term);
      factorized.norms.Remove(termDeps);
      factorized.imps.Remove(impDeps);
      delete term ;
      delete termDeps ;
      delete impDeps ;
      anyAction=true ;
    }
  }
 
  // Check if there are any left over terms that cannot be generated
  // separately due to cross dependency of observables
  if (!factorized.terms.empty()) {
 
    cxcoutD(Generation) << "RooProdGenContext::ctor() there are left-over terms that need to be generated separately" << std::endl ;
 
    // Concatenate remaining terms
    auto normIter = factorized.norms.begin();
    RooArgSet trailerTerm ;
    RooArgSet trailerTermDeps ;
    for(auto * term : static_range_cast<RooArgSet*>(factorized.terms)) {
      auto* termDeps = static_cast<RooArgSet*>(*normIter);
      trailerTerm.add(*term) ;
      trailerTermDeps.add(*termDeps) ;
      ++normIter;
    }
 
    const std::string name = model.makeRGPPName("PRODGEN_",trailerTerm,RooArgSet(),RooArgSet(),nullptr) ;
 
    // Construct auxiliary PDF expressing product of composite terms,
    // following Partial/Full component specification of input model
    RooLinkedList cmdList ;
    RooLinkedList pdfSetList ;
    RooArgSet fullPdfSet ;
 
    for(auto * pdf : static_range_cast<RooAbsPdf*>(trailerTerm)) {
 
      RooArgSet* pdfnset = model.findPdfNSet(*pdf) ;
      RooArgSet* pdfSet = new RooArgSet(*pdf) ;
      pdfSetList.Add(pdfSet) ;
 
      if (pdfnset && !pdfnset->empty()) {
   // This PDF requires a Conditional() construction
     cmdList.Add(RooFit::Conditional(*pdfSet,*pdfnset).Clone()) ;
      } else {
   fullPdfSet.add(*pdfSet) ;
      }
 
    }
//     cmdList.Print("v") ;
    auto multiPdf = std::make_unique<RooProdPdf>(name.c_str(),name.c_str(),fullPdfSet,cmdList);
    cmdList.Delete() ;
    pdfSetList.Delete() ;
 
    multiPdf->setOperMode(RooAbsArg::ADirty,true) ;
    multiPdf->useDefaultGen(true) ;
 
    cxcoutD(Generation) << "RooProdGenContext(" << model.GetName() << "): creating context for irreducible composite trailer term "
    << multiPdf->GetName() << " that generates observables " << trailerTermDeps << std::endl ;
    _gcList.emplace_back(multiPdf->genContext(trailerTermDeps,prototype,auxProto,verbose));
 
    _ownedMultiProds.addOwned(std::move(multiPdf));
  }
 
  // Now check if the are observables in vars that are not generated by any of the above p.d.f.s
  // If not, generate uniform distributions for these using a special context
  _uniObs.add(vars) ;
  _uniObs.remove(genDeps,true,true) ;
  if (!_uniObs.empty()) {
    coutI(Generation) << "RooProdGenContext(" << model.GetName() << "): generating uniform distribution for non-dependent observable(s) " << _uniObs << std::endl;
  }
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Destructor. Delete all owned subgenerator contexts
 
RooProdGenContext::~RooProdGenContext() {}
 
 
////////////////////////////////////////////////////////////////////////////////
/// Attach generator to given event buffer
 
void RooProdGenContext::attach(const RooArgSet& args)
{
  //Forward initGenerator call to all components
  for (auto const& elem : _gcList) {
    elem->attach(args) ;
  }
}
 
 
////////////////////////////////////////////////////////////////////////////////
/// One-time initialization of generator context, forward to component generators
 
void RooProdGenContext::initGenerator(const RooArgSet &theEvent)
{
  // Forward initGenerator call to all components
  for (auto const& elem : _gcList) {
    elem->initGenerator(theEvent) ;
  }
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Generate a single event of the product by generating the components
/// of the products sequentially. The subcontext have been order such
/// that all conditional dependencies are correctly taken into account
/// when processed in sequential order
 
void RooProdGenContext::generateEvent(RooArgSet &theEvent, Int_t remaining)
{
  // Loop over the component generators
 
  for (auto const& elem : _gcList) {
    elem->generateEvent(theEvent,remaining) ;
  }
 
  // Generate uniform variables (non-dependents)
  if (!_uniObs.empty()) {
    for(auto * arglv : dynamic_range_cast<RooAbsLValue*>(_uniObs)) {
      if (arglv) {
   arglv->randomize() ;
      }
    }
    theEvent.assign(_uniObs) ;
  }
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Set the traversal order of the prototype dataset by the
/// given lookup table
 
void RooProdGenContext::setProtoDataOrder(Int_t* lut)
{
  // Forward call to component generators
  RooAbsGenContext::setProtoDataOrder(lut) ;
 
  for (auto const& elem : _gcList) {
    elem->setProtoDataOrder(lut) ;
  }
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Detailed printing interface
 
void RooProdGenContext::printMultiline(ostream &os, Int_t content, bool verbose, TString indent) const
{
  RooAbsGenContext::printMultiline(os,content,verbose,indent) ;
  os << indent << "--- RooProdGenContext ---" << std::endl ;
  os << indent << "Using PDF ";
  _pdf->printStream(os,kName|kArgs|kClassName,kSingleLine,indent);
  os << indent << "List of component generators" << std::endl ;
 
  TString indent2(indent) ;
  indent2.Append("    ") ;
 
  for (auto const& elem : _gcList) {
    elem->printMultiline(os,content,verbose,indent2) ;
  }
}