ProcTMVA.cc

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// -*- C++ -*-
//
// Package:     MVAComputer
// Class  :     ProcTMVA
// 

// Implementation:
//     TMVA wrapper, needs n non-optional, non-multiple input variables
//     and outputs one result variable. All TMVA algorithms can be used,
//     calibration data is passed via stream and extracted from a zipped
//     buffer.
//
// Author:      Christophe Saout
// Created:     Sat Apr 24 15:18 CEST 2007
//

#include <sstream>
#include <string>
#include <vector>
#include <memory>
#include <iostream>
#include <cstdio>

// ROOT version magic to support TMVA interface changes in newer ROOT
#include <RVersion.h>

#include <TMVA/Types.h>
#include <TMVA/MethodBase.h>
#include "TMVA/Reader.h"

#include "PhysicsTools/MVAComputer/interface/memstream.h"
#include "PhysicsTools/MVAComputer/interface/zstream.h"

#include "PhysicsTools/MVAComputer/interface/VarProcessor.h"
#include "PhysicsTools/MVAComputer/interface/Calibration.h"
#include "PhysicsTools/MVAComputer/interface/mva_computer_define_plugin.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include <boost/filesystem.hpp>

using namespace PhysicsTools;

namespace { // anonymous

class ProcTMVA : public VarProcessor {
    public:
    typedef VarProcessor::Registry::Registry<ProcTMVA,
                    Calibration::ProcExternal> Registry;

    ProcTMVA(const char *name,
             const Calibration::ProcExternal *calib,
             const MVAComputer *computer);
    virtual ~ProcTMVA() {}

    virtual void configure(ConfIterator iter, unsigned int n) override;
    virtual void eval(ValueIterator iter, unsigned int n) const override;

    private:
  std::unique_ptr<TMVA::Reader>     reader;
  TMVA::MethodBase* method;
  std::string   methodName;
  unsigned int  nVars;

  // FIXME: Gena
  TString   methodName_t;
};

ProcTMVA::Registry registry("ProcTMVA");

ProcTMVA::ProcTMVA(const char *name,
                   const Calibration::ProcExternal *calib,
                   const MVAComputer *computer) :
    VarProcessor(name, calib, computer)
{

  reader = std::unique_ptr<TMVA::Reader>(new TMVA::Reader( "!Color:Silent" ));
  
  ext::imemstream is(
             reinterpret_cast<const char*>(&calib->store.front()),
             calib->store.size());
  ext::izstream izs(&is);
  
  std::getline(izs, methodName);

  std::string tmp;
  std::getline(izs, tmp);
  std::istringstream iss(tmp);
  iss >> nVars;
  for(unsigned int i = 0; i < nVars; i++) {
    std::getline(izs, tmp);
    reader->DataInfo().AddVariable(tmp.c_str());
  }
  
  // The rest of the gzip blob is the weights file
  std::string weight_text;
  std::string line;
  while (std::getline(izs, line)) {
    weight_text += line;
    weight_text += "\n";
  }


  // Build our reader
  TMVA::Types::EMVA methodType =
    TMVA::Types::Instance().GetMethodType(methodName);
  // Check if xml format
  if (weight_text.find("<?xml") != std::string::npos) {
     method = dynamic_cast<TMVA::MethodBase*>( reader->BookMVA( methodType, weight_text.c_str() ) );
  } else {
    // Write to a temporary file
    TString weight_file_name(boost::filesystem::unique_path().c_str());
    std::ofstream weight_file;
    weight_file.open(weight_file_name.Data());
    weight_file << weight_text;
    weight_file.close();
    edm::LogInfo("LegacyMVA") << "Building legacy TMVA plugin - "
      << "the weights are being stored in " << weight_file_name << std::endl;
    methodName_t.Append(methodName.c_str());
    method = dynamic_cast<TMVA::MethodBase*>( reader->BookMVA( methodName_t, weight_file_name ) );
    remove(weight_file_name.Data());
  }

  /*
  bool isXml = false; // weights in XML (TMVA 4) or plain text
  bool isFirstPass = true;
  TString weight_file_name(tmpnam(0));
  std:: ofstream weight_file;
  //

  std::string weights;
  while (izs.good()) {
    std::string tmp;

    if (isFirstPass){
      std::getline(izs, tmp);
      isFirstPass = false;
      if ( tmp.find("<?xml") != std::string::npos ){ //xml
    isXml = true;
    weights += tmp + " "; 
      }
      else{
    std::cout << std::endl;
    std::cout << "ProcTMVA::ProcTMVA(): *** WARNING! ***" << std::endl;
    std::cout << "ProcTMVA::ProcTMVA(): Old pre-TMVA 4 plain text weights are being loaded" << std::endl;
    std::cout << "ProcTMVA::ProcTMVA(): It may work but backwards compatibility is not guaranteed" << std::endl;
    std::cout << "ProcTMVA::ProcTMVA(): TMVA 4 weight file format is XML" << std::endl;
    std::cout << "ProcTMVA::ProcTMVA(): Retrain your networks as soon as possible!" << std::endl;
    std::cout << "ProcTMVA::ProcTMVA(): Creating temporary weight file " << weight_file_name << std::endl;
    weight_file.open(weight_file_name.Data());
    weight_file << tmp << std::endl;
      }
    } // end first pass
    else{
      if (isXml){ // xml
    izs >> tmp;
    weights += tmp + " "; 
      }
      else{       // plain text
    weight_file << tmp << std::endl;
      }
    } // end not first pass
    
  }
  if (weight_file.is_open()){
    std::cout << "ProcTMVA::ProcTMVA(): Deleting temporary weight file " << weight_file_name << std::endl;
    weight_file.close();
  }

  TMVA::Types::EMVA methodType =
              TMVA::Types::Instance().GetMethodType(methodName);

 if (isXml){
   method = std::unique_ptr<TMVA::MethodBase>
     ( dynamic_cast<TMVA::MethodBase*>
       ( reader->BookMVA( methodType, weights.c_str() ) ) ); 
 }
 else{
   methodName_t.Clear();
   methodName_t.Append(methodName.c_str());
   method = std::unique_ptr<TMVA::MethodBase>
     ( dynamic_cast<TMVA::MethodBase*>
       ( reader->BookMVA( methodName_t, weight_file_name ) ) );
 }

  */
}

void ProcTMVA::configure(ConfIterator iter, unsigned int n)
{
    if (n != nVars)
        return;

    for(unsigned int i = 0; i < n; i++)
        iter++(Variable::FLAG_NONE);

    iter << Variable::FLAG_NONE;
}

void ProcTMVA::eval(ValueIterator iter, unsigned int n) const
{
  std::vector<Float_t> inputs;
  inputs.reserve(n);
    for(unsigned int i = 0; i < n; i++)
    inputs.push_back(*iter++);
  std::unique_ptr<TMVA::Event> evt(new TMVA::Event(inputs, 2));

  double result = method->GetMvaValue(evt.get());

  iter(result);
}

} // anonymous namespace
MVA_COMPUTER_DEFINE_PLUGIN(ProcTMVA);