BDTHelper.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#include "tauRecTools/BDTHelper.h"
 
#include "TFile.h"
#include "TTree.h"
#include "TObjArray.h"
#include "TObjString.h"
 
namespace tauRecTools {
 
BDTHelper::BDTHelper() : 
  asg::AsgMessaging("BDTHelper"),
  m_BDT(nullptr) {
}
 
 
BDTHelper::~BDTHelper() {
}
 
StatusCode BDTHelper::initialize(const TString& weightFileName) {
  
  std::unique_ptr<TFile> file(TFile::Open(weightFileName));
  if (!file) {
    ATH_MSG_ERROR("Cannot find input BDT file: " << weightFileName);
    return StatusCode::FAILURE;
  }
  ATH_MSG_INFO( "Open file: " << weightFileName);
 
  TTree* tree = dynamic_cast<TTree*> (file->Get("BDT"));
  if (!tree) {
    ATH_MSG_ERROR("Cannot find input BDT tree");
    return StatusCode::FAILURE;
  }
  m_BDT = std::make_unique<MVAUtils::BDT>(tree);
 
  TNamed* varList = dynamic_cast<TNamed*> (file->Get("varList"));
  if (!varList) {
    ATH_MSG_ERROR("No variable list in file: " << weightFileName);
    return StatusCode::FAILURE;
  }
  TString names = varList->GetTitle();
  delete varList;
 
  // abtain the list of input variables  
  m_inputVariableNames = parseString(names);
 
  file->Close();
 
  return StatusCode::SUCCESS;
}
 
std::vector<TString> BDTHelper::parseString(const TString& str, const TString& delim/*=","*/) const {
  std::vector<TString> parsedString;
 
  TObjArray* objList = str.Tokenize(delim);
  size_t arraySize = objList->GetEntries();
  
  // split the string with ",", and put them into a vector
  for(size_t i = 0; i < arraySize; ++i) {
    if (auto *str = dynamic_cast<TObjString*> (objList->At(i))) {
      TString var = str->String();
      var.ReplaceAll(" ", "");
      if(var.Contains(":=")) {
        var=var(var.Index(":=")+2, var.Length()-var.Index(":=")-2);
      }
      if(0==var.Length()) continue;
      parsedString.push_back(var);
    }
  }
 
  delete objList;
 
  return parsedString;
}
 
std::vector<float> BDTHelper::getInputVariables(const std::map<TString, float>& availableVariables) const {  
  std::vector<float> values;
 
  // sort the input variables by the order in varList (from BDT)
  for (const TString& name : m_inputVariableNames) {
    std::map<TString, float>::const_iterator itr = availableVariables.find(name);
    if(itr==availableVariables.end()) {
      ATH_MSG_ERROR(name << " not available");
    }
    else {
      values.push_back(itr->second);
    }
  }
 
  return values;
}
 
std::vector<float> BDTHelper::getInputVariables(const std::map<TString, float*>& availableVariables) const {  
  std::vector<float> values;
 
  // sort the input variables by the order in varList (from BDT)
  for (const TString& name : m_inputVariableNames) {
    std::map<TString, float*>::const_iterator itr = availableVariables.find(name);
    if(itr==availableVariables.end()) {
      ATH_MSG_ERROR(name << " not available");
    }
    else {
      values.push_back(*itr->second);
    }
  }
 
  return values;
}
 
float BDTHelper::getGradBoostMVA(const std::map<TString, float>& availableVariables) const {
  std::vector<float> values = getInputVariables(availableVariables);
 
  if (values.size() < m_inputVariableNames.size()) {
    ATH_MSG_ERROR("There are missing variables when calculating the BDT score, will return -999");
    return  -999;
  }
  else {  
    return  m_BDT->GetGradBoostMVA(values);
  }
}
 
 
float BDTHelper::getResponse(const std::map<TString, float*>& availableVariables) const {
  std::vector<float> values = getInputVariables(availableVariables);
 
  if (values.size() < m_inputVariableNames.size()) {
    ATH_MSG_ERROR("There are missing variables when calculating the BDT score, will return -999");
    return -999;
  }
  else {
    return  m_BDT->GetResponse(values);
  }
}
 
} // end of namespace tauRecTools