RooAbsTestStatistic.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 RooAbsTestStatistic.cxx
\class RooAbsTestStatistic
\ingroup Roofitcore
 
RooAbsTestStatistic is the abstract base class for all test
statistics. Test statistics that evaluate the PDF at each data
point should inherit from the RooAbsOptTestStatistic class which
implements several generic optimizations that can be done for such
quantities.
 
This test statistic base class organizes calculation of test
statistic values for RooSimultaneous PDF as a combination of test
statistic values for the PDF components of the simultaneous PDF and
organizes multi-processor parallel calculation of test statistic
values. For the latter, the test statistic value is calculated in
partitions in parallel executing processes and a posteriori
combined in the main thread.
**/
 
#include "RooAbsTestStatistic.h"
 
#include "RooFit.h"
#include "RooAbsPdf.h"
#include "RooSimultaneous.h"
#include "RooAbsData.h"
#include "RooArgSet.h"
#include "RooRealVar.h"
#include "RooNLLVar.h"
#include "RooRealMPFE.h"
#include "RooErrorHandler.h"
#include "RooMsgService.h"
#include "RooProdPdf.h"
#include "RooRealSumPdf.h"
#include "RooAbsCategoryLValue.h"
 
#include "TTimeStamp.h"
#include "TClass.h"
#include <string>
#include <stdexcept>
 
using namespace std;
 
ClassImp(RooAbsTestStatistic);
 
////////////////////////////////////////////////////////////////////////////////
/// Default constructor
 
RooAbsTestStatistic::RooAbsTestStatistic() :
  _func(0), _data(0), _projDeps(0), _splitRange(0), _simCount(0),
  _verbose(kFALSE), _init(kFALSE), _gofOpMode(Slave), _nEvents(0), _setNum(0),
  _numSets(0), _extSet(0), _nGof(0), _gofArray(0), _nCPU(1), _mpfeArray(0),
  _mpinterl(RooFit::BulkPartition), _doOffset(kFALSE), _offset(0),
  _offsetCarry(0), _evalCarry(0)
{
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Create a test statistic from the given function and the data.
/// \param[in] name Name of the test statistic
/// \param[in] title Title (for plotting)
/// \param[in] real Function to be used for tests
/// \param[in] data Data to fit function to
/// \param[in] projDeps A set of projected observables
/// \param[in] rangeName Fit data only in range with given name
/// \param[in] addCoefRangeName If not null, all RooAddPdf components of `real` will be instructed to fix their fraction definitions to the given named range.
/// \param[in] nCPU If larger than one, the test statistic calculation will be parallelized over multiple processes.
/// By default the data is split with 'bulk' partitioning (each process calculates a contigious block of fraction 1/nCPU
/// of the data). For binned data this approach may be suboptimal as the number of bins with >0 entries
/// in each processing block many vary greatly thereby distributing the workload rather unevenly.
/// \param[in] interleave is set to true, the interleave partitioning strategy is used where each partition
/// i takes all bins for which (ibin % ncpu == i) which is more likely to result in an even workload.
/// \param[in] verbose Be more verbose.
/// \param[in] splitCutRange If true, a different rangeName constructed as rangeName_{catName} will be used
/// as range definition for each index state of a RooSimultaneous. This means that a different range can be defined
/// for each category such as
/// ```
/// myVariable.setRange("range_pi0", 135, 210);
/// myVariable.setRange("range_gamma", 50, 210);
/// ```
/// if the categories are called "pi0" and "gamma".
 
RooAbsTestStatistic::RooAbsTestStatistic(const char *name, const char *title, RooAbsReal& real, RooAbsData& data,
                const RooArgSet& projDeps, const char* rangeName, const char* addCoefRangeName,
                Int_t nCPU, RooFit::MPSplit interleave, Bool_t verbose, Bool_t splitCutRange) :
  RooAbsReal(name,title),
  _paramSet("paramSet","Set of parameters",this),
  _func(&real),
  _data(&data),
  _projDeps((RooArgSet*)projDeps.Clone()),
  _rangeName(rangeName?rangeName:""),
  _addCoefRangeName(addCoefRangeName?addCoefRangeName:""),
  _splitRange(splitCutRange),
  _simCount(1),
  _verbose(verbose),
  _nGof(0),
  _gofArray(0),
  _nCPU(nCPU),
  _mpfeArray(0),
  _mpinterl(interleave),
  _doOffset(kFALSE),
  _offset(0),
  _offsetCarry(0),
  _evalCarry(0)
{
  // Register all parameters as servers
  RooArgSet* params = real.getParameters(&data) ;
  _paramSet.add(*params) ;
  delete params ;
 
  if (_nCPU>1 || _nCPU==-1) {
 
    if (_nCPU==-1) {
      _nCPU=1 ;
    }
 
    _gofOpMode = MPMaster ;
 
  } else {
 
    // Determine if RooAbsReal is a RooSimultaneous
    Bool_t simMode = dynamic_cast<RooSimultaneous*>(&real)?kTRUE:kFALSE ;
 
    if (simMode) {
      _gofOpMode = SimMaster ;
    } else {
      _gofOpMode = Slave ;
    }
  }
 
  _setNum = 0 ;
  _extSet = 0 ;
  _numSets = 1 ;
  _init = kFALSE ;
  _nEvents = data.numEntries() ;
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Copy constructor
 
RooAbsTestStatistic::RooAbsTestStatistic(const RooAbsTestStatistic& other, const char* name) :
  RooAbsReal(other,name),
  _paramSet("paramSet","Set of parameters",this),
  _func(other._func),
  _data(other._data),
  _projDeps((RooArgSet*)other._projDeps->Clone()),
  _rangeName(other._rangeName),
  _addCoefRangeName(other._addCoefRangeName),
  _splitRange(other._splitRange),
  _simCount(1),
  _verbose(other._verbose),
  _nGof(0),
  _gofArray(0),
  _gofSplitMode(other._gofSplitMode),
  _nCPU(other._nCPU),
  _mpfeArray(0),
  _mpinterl(other._mpinterl),
  _doOffset(other._doOffset),
  _offset(other._offset),
  _offsetCarry(other._offsetCarry),
  _evalCarry(other._evalCarry)
{
  // Our parameters are those of original
  _paramSet.add(other._paramSet) ;
 
  if (_nCPU>1 || _nCPU==-1) {
 
    if (_nCPU==-1) {
      _nCPU=1 ;
    }
      
    _gofOpMode = MPMaster ;
 
  } else {
 
    // Determine if RooAbsReal is a RooSimultaneous
    Bool_t simMode = dynamic_cast<RooSimultaneous*>(_func)?kTRUE:kFALSE ;
 
    if (simMode) {
      _gofOpMode = SimMaster ;
    } else {
      _gofOpMode = Slave ;
    }
  }
 
  _setNum = 0 ;
  _extSet = 0 ;
  _numSets = 1 ;
  _init = kFALSE ;
  _nEvents = _data->numEntries() ;
 
 
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Destructor
 
RooAbsTestStatistic::~RooAbsTestStatistic()
{
  if (MPMaster == _gofOpMode && _init) {
    for (Int_t i = 0; i < _nCPU; ++i) delete _mpfeArray[i];
    delete[] _mpfeArray ;
  }
 
  if (SimMaster == _gofOpMode && _init) {
    for (Int_t i = 0; i < _nGof; ++i) delete _gofArray[i];
    delete[] _gofArray ;
  }
 
  delete _projDeps ;
 
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Calculate and return value of test statistic. If the test statistic
/// is calculated from a RooSimultaneous, the test statistic calculation
/// is performed separately on each simultaneous p.d.f component and associated
/// data, and then combined. If the test statistic calculation is parallelized,
/// partitions are calculated in nCPU processes and combined a posteriori.
 
Double_t RooAbsTestStatistic::evaluate() const
{
  // One-time Initialization
  if (!_init) {
    const_cast<RooAbsTestStatistic*>(this)->initialize() ;
  }
 
  if (SimMaster == _gofOpMode) {
    // Evaluate array of owned GOF objects
    Double_t ret = 0.;
 
    if (_mpinterl == RooFit::BulkPartition || _mpinterl == RooFit::Interleave ) {
      ret = combinedValue((RooAbsReal**)_gofArray,_nGof);
    } else {
      Double_t sum = 0., carry = 0.;
      for (Int_t i = 0 ; i < _nGof; ++i) {
   if (i % _numSets == _setNum || (_mpinterl==RooFit::Hybrid && _gofSplitMode[i] != RooFit::SimComponents )) {
     Double_t y = _gofArray[i]->getValV();
     carry += _gofArray[i]->getCarry();
     y -= carry;
     const Double_t t = sum + y;
     carry = (t - sum) - y;
     sum = t;
   }
      }
      ret = sum ;
      _evalCarry = carry;
    }
 
    // Only apply global normalization if SimMaster doesn't have MP master
    if (numSets()==1) {
      const Double_t norm = globalNormalization();
      ret /= norm;
      _evalCarry /= norm;
    }
 
    return ret ;
 
  } else if (MPMaster == _gofOpMode) {
    
    // Start calculations in parallel
    for (Int_t i = 0; i < _nCPU; ++i) _mpfeArray[i]->calculate();
 
 
    Double_t sum(0), carry = 0.;
    for (Int_t i = 0; i < _nCPU; ++i) {
      Double_t y = _mpfeArray[i]->getValV();
      carry += _mpfeArray[i]->getCarry();
      y -= carry;
      const Double_t t = sum + y;
      carry = (t - sum) - y;
      sum = t;
    }
 
    Double_t ret = sum ;
    _evalCarry = carry;
    return ret ;
 
  } else {
 
    // Evaluate as straight FUNC
    Int_t nFirst(0), nLast(_nEvents), nStep(1) ;
    
    switch (_mpinterl) {
    case RooFit::BulkPartition:
      nFirst = _nEvents * _setNum / _numSets ;
      nLast  = _nEvents * (_setNum+1) / _numSets ;
      nStep  = 1 ;
      break;
      
    case RooFit::Interleave:
      nFirst = _setNum ;
      nLast  = _nEvents ;
      nStep  = _numSets ;
      break ;
      
    case RooFit::SimComponents:
      nFirst = 0 ;
      nLast  = _nEvents ;
      nStep  = 1 ;
      break ;
      
    case RooFit::Hybrid:
      throw std::logic_error("this should never happen");
      break ;
    }
 
    Double_t ret = evaluatePartition(nFirst,nLast,nStep);
 
    if (numSets()==1) {
      const Double_t norm = globalNormalization();
      ret /= norm;
      _evalCarry /= norm;
    }
    
    return ret ;
 
  }
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// One-time initialization of the test statistic. Setup
/// infrastructure for simultaneous p.d.f processing and/or
/// parallelized processing if requested
 
Bool_t RooAbsTestStatistic::initialize()
{
  if (_init) return kFALSE;
  
  if (MPMaster == _gofOpMode) {
    initMPMode(_func,_data,_projDeps,_rangeName.size()?_rangeName.c_str():0,_addCoefRangeName.size()?_addCoefRangeName.c_str():0) ;
  } else if (SimMaster == _gofOpMode) {
    initSimMode((RooSimultaneous*)_func,_data,_projDeps,_rangeName.size()?_rangeName.c_str():0,_addCoefRangeName.size()?_addCoefRangeName.c_str():0) ;
  }
  _init = kTRUE;
  return kFALSE;
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Forward server redirect calls to component test statistics
 
Bool_t RooAbsTestStatistic::redirectServersHook(const RooAbsCollection& newServerList, Bool_t mustReplaceAll, Bool_t nameChange, Bool_t)
{
  if (SimMaster == _gofOpMode && _gofArray) {
    // Forward to slaves
    for (Int_t i = 0; i < _nGof; ++i) {
      if (_gofArray[i]) {
   _gofArray[i]->recursiveRedirectServers(newServerList,mustReplaceAll,nameChange);
      }
    }
  } else if (MPMaster == _gofOpMode&& _mpfeArray) {
    // Forward to slaves
    for (Int_t i = 0; i < _nCPU; ++i) {
      if (_mpfeArray[i]) {
   _mpfeArray[i]->recursiveRedirectServers(newServerList,mustReplaceAll,nameChange);
//    cout << "redirecting servers on " << _mpfeArray[i]->GetName() << endl;
      }
    }
  }
  return kFALSE;
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Add extra information on component test statistics when printing
/// itself as part of a tree structure
 
void RooAbsTestStatistic::printCompactTreeHook(ostream& os, const char* indent)
{
  if (SimMaster == _gofOpMode) {
    // Forward to slaves
    os << indent << "RooAbsTestStatistic begin GOF contents" << endl ;
    for (Int_t i = 0; i < _nGof; ++i) {
      if (_gofArray[i]) {
   TString indent2(indent);
   indent2 += Form("[%d] ",i);
   _gofArray[i]->printCompactTreeHook(os,indent2);
      }
    }
    os << indent << "RooAbsTestStatistic end GOF contents" << endl;
  } else if (MPMaster == _gofOpMode) {
    // WVE implement this
  }
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Forward constant term optimization management calls to component
/// test statistics
 
void RooAbsTestStatistic::constOptimizeTestStatistic(ConstOpCode opcode, Bool_t doAlsoTrackingOpt)
{
  initialize();
  if (SimMaster == _gofOpMode) {
    // Forward to slaves
    for (Int_t i = 0; i < _nGof; ++i) {
      // In SimComponents Splitting strategy only constOptimize the terms that are actually used
      RooFit::MPSplit effSplit = (_mpinterl!=RooFit::Hybrid) ? _mpinterl : _gofSplitMode[i];
      if ( (i % _numSets == _setNum) || (effSplit != RooFit::SimComponents) ) {
   if (_gofArray[i]) _gofArray[i]->constOptimizeTestStatistic(opcode,doAlsoTrackingOpt);
      }
    }
  } else if (MPMaster == _gofOpMode) {
    for (Int_t i = 0; i < _nCPU; ++i) {
      _mpfeArray[i]->constOptimizeTestStatistic(opcode,doAlsoTrackingOpt);
    }
  }
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Set MultiProcessor set number identification of this instance
 
void RooAbsTestStatistic::setMPSet(Int_t inSetNum, Int_t inNumSets)
{
  _setNum = inSetNum; _numSets = inNumSets;
  _extSet = _mpinterl==RooFit::SimComponents ? _setNum : (_numSets - 1);
  
  if (SimMaster == _gofOpMode) {
    // Forward to slaves
    initialize();
    for (Int_t i = 0; i < _nGof; ++i) {
      if (_gofArray[i]) _gofArray[i]->setMPSet(inSetNum,inNumSets);
    }
  }
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Initialize multi-processor calculation mode. Create component test statistics in separate
/// processed that are connected to this process through a RooAbsRealMPFE front-end class.
 
void RooAbsTestStatistic::initMPMode(RooAbsReal* real, RooAbsData* data, const RooArgSet* projDeps, const char* rangeName, const char* addCoefRangeName)
{
  _mpfeArray = new pRooRealMPFE[_nCPU];
 
  // Create proto-goodness-of-fit
  RooAbsTestStatistic* gof = create(GetName(),GetTitle(),*real,*data,*projDeps,rangeName,addCoefRangeName,1,_mpinterl,_verbose,_splitRange);
  gof->recursiveRedirectServers(_paramSet);
 
  for (Int_t i = 0; i < _nCPU; ++i) {
    gof->setMPSet(i,_nCPU);
    gof->SetName(Form("%s_GOF%d",GetName(),i));
    gof->SetTitle(Form("%s_GOF%d",GetTitle(),i));
 
    ccoutD(Eval) << "RooAbsTestStatistic::initMPMode: starting remote server process #" << i << endl;
    _mpfeArray[i] = new RooRealMPFE(Form("%s_%lx_MPFE%d",GetName(),(ULong_t)this,i),Form("%s_%lx_MPFE%d",GetTitle(),(ULong_t)this,i),*gof,false);
    //_mpfeArray[i]->setVerbose(kTRUE,kTRUE);
    _mpfeArray[i]->initialize();
    if (i > 0) {
      _mpfeArray[i]->followAsSlave(*_mpfeArray[0]);
    }
  }
  _mpfeArray[_nCPU - 1]->addOwnedComponents(*gof);
  coutI(Eval) << "RooAbsTestStatistic::initMPMode: started " << _nCPU << " remote server process." << endl;
  //cout << "initMPMode --- done" << endl ;
  return ;
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Initialize simultaneous p.d.f processing mode. Strip simultaneous
/// p.d.f into individual components, split dataset in subset
/// matching each component and create component test statistics for
/// each of them.
 
void RooAbsTestStatistic::initSimMode(RooSimultaneous* simpdf, RooAbsData* data,
                  const RooArgSet* projDeps, const char* rangeName, const char* addCoefRangeName)
{
 
  RooAbsCategoryLValue& simCat = const_cast<RooAbsCategoryLValue&>(simpdf->indexCat());
 
  TString simCatName(simCat.GetName());
  TList* dsetList = const_cast<RooAbsData*>(data)->split(simCat,processEmptyDataSets());
  if (!dsetList) {
    coutE(Fitting) << "RooAbsTestStatistic::initSimMode(" << GetName() << ") ERROR: index category of simultaneous pdf is missing in dataset, aborting" << endl;
    throw std::runtime_error("RooAbsTestStatistic::initSimMode() ERROR, index category of simultaneous pdf is missing in dataset, aborting");
  }
 
  // Count number of used states
  Int_t n = 0;
  _nGof = 0;
 
  for (const auto& catState : simCat) {
    // Retrieve the PDF for this simCat state
    RooAbsPdf* pdf = simpdf->getPdf(catState.first.c_str());
    RooAbsData* dset = (RooAbsData*) dsetList->FindObject(catState.first.c_str());
 
    if (pdf && dset && (0. != dset->sumEntries() || processEmptyDataSets())) {
      ++_nGof;
    }
  }
 
  // Allocate arrays
  _gofArray = new pRooAbsTestStatistic[_nGof];
  _gofSplitMode.resize(_nGof);
 
  // Create array of regular fit contexts, containing subset of data and single fitCat PDF
  for (const auto& catState : simCat) {
    const std::string& catName = catState.first;
    // Retrieve the PDF for this simCat state
    RooAbsPdf* pdf = simpdf->getPdf(catName.c_str());
    RooAbsData* dset = (RooAbsData*) dsetList->FindObject(catName.c_str());
 
    if (pdf && dset && (0. != dset->sumEntries() || processEmptyDataSets())) {
      ccoutI(Fitting) << "RooAbsTestStatistic::initSimMode: creating slave calculator #" << n << " for state " << catName
          << " (" << dset->numEntries() << " dataset entries)" << endl;
 
 
      // *** START HERE
      // WVE HACK determine if we have a RooRealSumPdf and then treat it like a binned likelihood
      RooAbsPdf* binnedPdf = 0 ;
      Bool_t binnedL = kFALSE ;
      if (pdf->getAttribute("BinnedLikelihood") && pdf->IsA()->InheritsFrom(RooRealSumPdf::Class())) {
        // Simplest case: top-level of component is a RRSP
        binnedPdf = pdf ;
        binnedL = kTRUE ;
      } else if (pdf->IsA()->InheritsFrom(RooProdPdf::Class())) {
        // Default case: top-level pdf is a product of RRSP and other pdfs
        RooFIter iter = ((RooProdPdf*)pdf)->pdfList().fwdIterator() ;
        RooAbsArg* component ;
        while ((component = iter.next())) {
          if (component->getAttribute("BinnedLikelihood") && component->IsA()->InheritsFrom(RooRealSumPdf::Class())) {
            binnedPdf = (RooAbsPdf*) component ;
            binnedL = kTRUE ;
          }
          if (component->getAttribute("MAIN_MEASUREMENT")) {
            // not really a binned pdf, but this prevents a (potentially) long list of subsidiary measurements to be passed to the slave calculator
            binnedPdf = (RooAbsPdf*) component ;
          }
        }
      }
      // WVE END HACK
      // Below here directly pass binnedPdf instead of PROD(binnedPdf,constraints) as constraints are evaluated elsewhere anyway
      // and omitting them reduces model complexity and associated handling/cloning times
      if (_splitRange && rangeName) {
        _gofArray[n] = create(catName.c_str(), catName.c_str(),(binnedPdf?*binnedPdf:*pdf),*dset,*projDeps,
            Form("%s_%s",rangeName,catName.c_str()),addCoefRangeName,_nCPU*(_mpinterl?-1:1),_mpinterl,_verbose,_splitRange,binnedL);
      } else {
        _gofArray[n] = create(catName.c_str(),catName.c_str(),(binnedPdf?*binnedPdf:*pdf),*dset,*projDeps,
            rangeName,addCoefRangeName,_nCPU,_mpinterl,_verbose,_splitRange,binnedL);
      }
      _gofArray[n]->setSimCount(_nGof);
      // *** END HERE
 
      // Fill per-component split mode with Bulk Partition for now so that Auto will map to bulk-splitting of all components
      if (_mpinterl==RooFit::Hybrid) {
        if (dset->numEntries()<10) {
          //cout << "RAT::initSim("<< GetName() << ") MP mode is auto, setting split mode for component "<< n << " to SimComponents"<< endl ;
          _gofSplitMode[n] = RooFit::SimComponents;
          _gofArray[n]->_mpinterl = RooFit::SimComponents;
        } else {
          //cout << "RAT::initSim("<< GetName() << ") MP mode is auto, setting split mode for component "<< n << " to BulkPartition"<< endl ;
          _gofSplitMode[n] = RooFit::BulkPartition;
          _gofArray[n]->_mpinterl = RooFit::BulkPartition;
        }
      }
 
      // Servers may have been redirected between instantiation and (deferred) initialization
 
      RooArgSet *actualParams = binnedPdf ? binnedPdf->getParameters(dset) : pdf->getParameters(dset);
      RooArgSet* selTargetParams = (RooArgSet*) _paramSet.selectCommon(*actualParams);
 
      _gofArray[n]->recursiveRedirectServers(*selTargetParams);
 
      delete selTargetParams;
      delete actualParams;
 
      ++n;
 
    } else {
      if ((!dset || (0. != dset->sumEntries() && !processEmptyDataSets())) && pdf) {
        if (_verbose) {
          ccoutD(Fitting) << "RooAbsTestStatistic::initSimMode: state " << catName
              << " has no data entries, no slave calculator created" << endl;
        }
      }
    }
  }
  coutI(Fitting) << "RooAbsTestStatistic::initSimMode: created " << n << " slave calculators." << endl;
 
  dsetList->Delete(); // delete the content.
  delete dsetList;
}
 
 
////////////////////////////////////////////////////////////////////////////////
/// Change dataset that is used to given one. If cloneData is kTRUE, a clone of
/// in the input dataset is made.  If the test statistic was constructed with
/// a range specification on the data, the cloneData argument is ignored and
/// the data is always cloned.
Bool_t RooAbsTestStatistic::setData(RooAbsData& indata, Bool_t cloneData) 
{ 
  // Trigger refresh of likelihood offsets 
  if (isOffsetting()) {
    enableOffsetting(kFALSE);
    enableOffsetting(kTRUE);
  }
 
  switch(operMode()) {
  case Slave:
    // Delegate to implementation
    return setDataSlave(indata, cloneData);
  case SimMaster:
    // Forward to slaves
    //     cout << "RATS::setData(" << GetName() << ") SimMaster, calling setDataSlave() on slave nodes" << endl;
    if (indata.canSplitFast()) {
      for (Int_t i = 0; i < _nGof; ++i) {
   RooAbsData* compData = indata.getSimData(_gofArray[i]->GetName());
   _gofArray[i]->setDataSlave(*compData, cloneData);
      }
    } else if (0 == indata.numEntries()) {
      // For an unsplit empty dataset, simply assign empty dataset to each component
      for (Int_t i = 0; i < _nGof; ++i) {
   _gofArray[i]->setDataSlave(indata, cloneData);
      }
    } else {
      const RooAbsCategoryLValue& indexCat = static_cast<RooSimultaneous*>(_func)->indexCat();
      TList* dlist = indata.split(indexCat, kTRUE);
      if (!dlist) {
        coutF(DataHandling) << "Tried to split '" << indata.GetName() << "' into categories of '" << indexCat.GetName()
            << "', but splitting failed. Input data:" << std::endl;
        indata.Print("V");
        throw std::runtime_error("Error when setting up test statistic: dataset couldn't be split into categories.");
      }
 
      for (Int_t i = 0; i < _nGof; ++i) {
        RooAbsData* compData = (RooAbsData*) dlist->FindObject(_gofArray[i]->GetName());
        //  cout << "component data for index " << _gofArray[i]->GetName() << " is " << compData << endl;
        if (compData) {
          _gofArray[i]->setDataSlave(*compData,kFALSE,kTRUE);
        } else {
          coutE(DataHandling) << "RooAbsTestStatistic::setData(" << GetName() << ") ERROR: Cannot find component data for state " << _gofArray[i]->GetName() << endl;
        }
      }
    }
    break;
  case MPMaster:
    // Not supported
    coutF(DataHandling) << "RooAbsTestStatistic::setData(" << GetName() << ") FATAL: setData() is not supported in multi-processor mode" << endl;
    throw std::runtime_error("RooAbsTestStatistic::setData is not supported in MPMaster mode");
    break;
  }
 
  return kTRUE;
}
 
 
 
void RooAbsTestStatistic::enableOffsetting(Bool_t flag) 
{
  // Apply internal value offsetting to control numeric precision
  if (!_init) {
    const_cast<RooAbsTestStatistic*>(this)->initialize() ;
  }
  
  switch(operMode()) {
  case Slave:
    _doOffset = flag ;
    // Clear offset if feature is disabled to that it is recalculated next time it is enabled
    if (!_doOffset) {
      _offset = 0 ;
      _offsetCarry = 0;
    }
    setValueDirty() ;
    break ;
  case SimMaster:
    _doOffset = flag;
    for (Int_t i = 0; i < _nGof; ++i) {
      _gofArray[i]->enableOffsetting(flag);
    }
    break ;
  case MPMaster:    
    _doOffset = flag;
    for (Int_t i = 0; i < _nCPU; ++i) {
      _mpfeArray[i]->enableOffsetting(flag);
    }
    break;
  }
}
 
 
Double_t RooAbsTestStatistic::getCarry() const
{ return _evalCarry; }