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diff --git a/FixedOrderGen/include/Unweighter.hh b/FixedOrderGen/include/Unweighter.hh
new file mode 100644
index 0000000..bbabfbb
--- /dev/null
+++ b/FixedOrderGen/include/Unweighter.hh
@@ -0,0 +1,55 @@
+#pragma once
+
+#include <limits>
+#include <cmath>
+
+#include "RHEJ/optional.hh"
+
+namespace RHEJ {
+ class Event;
+}
+
+namespace CLHEP {
+ class Ranlux64Engine;
+}
+
+namespace HEJFOG {
+ namespace detail {
+ template<typename Iterator>
+ double calc_cut(Iterator begin, Iterator end, double max_dev) {
+ double mean = 0.;
+ double err = 0.;
+ double awt_sum = 0.;
+ for(; begin != end; ++begin){
+ const double awt = std::abs(begin->central().weight);
+ const double tmp = awt*std::log(awt);
+ mean += tmp;
+ err += tmp*tmp;
+ awt_sum += awt;
+ }
+ mean /= awt_sum;
+ err = std::sqrt(err)/awt_sum;
+ return std::exp(mean + max_dev*err);
+ }
+ }
+
+ class Unweighter {
+
+ public:
+ template<typename Iterator>
+ Unweighter(
+ Iterator begin, Iterator end, double max_dev,
+ CLHEP::Ranlux64Engine & ran
+ ):
+ cut_{detail::calc_cut(begin, end, max_dev)},
+ ran_{ran}
+ {}
+
+ RHEJ::optional<RHEJ::Event> unweight(RHEJ::Event ev) const;
+
+ private:
+ double cut_;
+ std::reference_wrapper<CLHEP::Ranlux64Engine> ran_;
+ };
+
+}
diff --git a/FixedOrderGen/src/Unweighter.cc b/FixedOrderGen/src/Unweighter.cc
new file mode 100644
index 0000000..167bca2
--- /dev/null
+++ b/FixedOrderGen/src/Unweighter.cc
@@ -0,0 +1,26 @@
+#include "Unweighter.hh"
+
+#include "RHEJ/Event.hh"
+
+#include <CLHEP/Random/Randomize.h>
+#include <CLHEP/Random/RanluxEngine.h>
+
+namespace HEJFOG {
+
+ namespace {
+ void normalise_weights(RHEJ::Event & ev, double target) {
+ const double awt = std::abs(ev.central().weight);
+ ev.central().weight *= target/awt;
+ for(auto & var: ev.variations()) var.weight *= target/awt;
+ }
+ }
+
+ RHEJ::optional<RHEJ::Event> Unweighter::unweight(RHEJ::Event ev) const {
+ const double awt = std::abs(ev.central().weight);
+ if(ran_.get().flat() < awt/cut_) {
+ if(awt < cut_) normalise_weights(ev, cut_);
+ return ev;
+ }
+ return {};
+ }
+}
diff --git a/FixedOrderGen/src/main.cc b/FixedOrderGen/src/main.cc
index 46e0a46..9af1756 100644
--- a/FixedOrderGen/src/main.cc
+++ b/FixedOrderGen/src/main.cc
@@ -1,222 +1,242 @@
/**
* Name: main.cc
* Authors: Jeppe R. Andersen
*/
#include <fstream>
#include <algorithm>
#include <memory>
#include <chrono>
#include <iostream>
#include <map>
#include "yaml-cpp/yaml.h"
#include "config.hh"
#include "LHEF/LHEF.h"
#include "RHEJ/CombinedEventWriter.hh"
#include "RHEJ/get_analysis.hh"
#include "RHEJ/utility.hh"
//#include "RHEJ/EventReweighter.hh"
#include "RHEJ/stream.hh"
#include "RHEJ/LesHouchesWriter.hh"
#include "EventGenerator.hh"
#include "PhaseSpacePoint.hh"
#include "Ranlux64Engine.hh"
#include "ProgressBar.hh"
+#include "Unweighter.hh"
namespace{
constexpr auto banner =
" __ ___ __ ______ __ __ \n"
" / / / (_)___ _/ /_ / ____/___ ___ _________ ___ __ / /__ / /______ \n"
" / /_/ / / __ `/ __ \\ / __/ / __ \\/ _ \\/ ___/ __ `/ / / / __ / / _ \\/ __/ ___/ \n"
" / __ / / /_/ / / / / / /___/ / / / __/ / / /_/ / /_/ / / /_/ / __/ /_(__ ) \n"
" /_/ /_/_/\\__, /_/ /_/ /_____/_/ /_/\\___/_/ \\__, /\\__, / \\____/\\___/\\__/____/ \n"
" ____///__/ __ ____ ///__//____/ ______ __ \n"
" / ____(_) _____ ____/ / / __ \\_________/ /__ _____ / ____/__ ____ ___ _________ _/ /_____ _____\n"
" / /_ / / |/_/ _ \\/ __ / / / / / ___/ __ / _ \\/ ___/ / / __/ _ \\/ __ \\/ _ \\/ ___/ __ `/ __/ __ \\/ ___/\n"
" / __/ / /> </ __/ /_/ / / /_/ / / / /_/ / __/ / / /_/ / __/ / / / __/ / / /_/ / /_/ /_/ / / \n"
" /_/ /_/_/|_|\\___/\\__,_/ \\____/_/ \\__,_/\\___/_/ \\____/\\___/_/ /_/\\___/_/ \\__,_/\\__/\\____/_/ \n"
;
constexpr double invGeV2_to_pb = 389379292.;
}
HEJFOG::Config load_config(char const * filename){
try{
return HEJFOG::load_config(filename);
}
catch(std::exception const & exc){
std::cerr << "Error: " << exc.what() << '\n';
std::exit(EXIT_FAILURE);
}
}
std::unique_ptr<RHEJ::Analysis> get_analysis(
YAML::Node const & parameters
){
try{
return RHEJ::get_analysis(parameters);
}
catch(std::exception const & exc){
std::cerr << "Failed to load analysis: " << exc.what() << '\n';
std::exit(EXIT_FAILURE);
}
}
void rescale_weights(RHEJ::Event & ev, double factor) {
ev.central().weight *= factor;
for(auto & var: ev.variations()){
var.weight *= factor;
}
}
int main(int argn, char** argv) {
if (argn < 2) {
std::cerr << "\n# Usage:\n.FOgen config_file\n";
return EXIT_FAILURE;
}
std::cout << banner;
fastjet::ClusterSequence::print_banner();
using clock = std::chrono::system_clock;
const auto start_time = clock::now();
// read configuration
auto config = load_config(argv[1]);
std::unique_ptr<RHEJ::Analysis> analysis = get_analysis(
config.analysis_parameters
);
assert(analysis != nullptr);
auto ran = HEJFOG::make_Ranlux64Engine();
if(config.RanLux_init) ran.restoreStatus(config.RanLux_init->c_str());
HEJFOG::EventGenerator generator{
config.process,
config.beam,
config.scale_gen,
config.jets,
config.pdf_id,
config.unordered_fraction,
config.Higgs_properties,
config.Higgs_coupling,
ran
};
//TODO: fix Les Houches init block (HEPRUP)
LHEF::HEPRUP lhefheprup;
lhefheprup.IDBMUP=std::pair<long,long>(config.beam.particles[0], config.beam.particles[1]);
lhefheprup.EBMUP=std::make_pair(config.beam.energy, config.beam.energy);
lhefheprup.PDFGUP=std::make_pair(0,0);
lhefheprup.PDFSUP=std::make_pair(config.pdf_id,config.pdf_id);
lhefheprup.NPRUP=1;
lhefheprup.XSECUP=std::vector<double>(1.);
lhefheprup.XERRUP=std::vector<double>(1.);
lhefheprup.LPRUP=std::vector<int>{1};
RHEJ::CombinedEventWriter writer{config.output, lhefheprup};
std::map<HEJFOG::Status, int> status_counter;
const int test_trials = config.trials;
double FKL_xs = 0., FKL_xs_err = 0.;
double uno_xs = 0., uno_xs_err = 0.;
std::vector<RHEJ::Event> events;
// warm-up phase: check how efficient we are
std::cout << "Warm-up ...\n";
HEJFOG::ProgressBar<int> warmup_progress{std::cout, test_trials};
const auto warmup_start = clock::now();
for(int trial = 0; trial < test_trials; ++trial){
++warmup_progress;
auto ev = generator.gen_event();
++status_counter[generator.status()];
if(generator.status() == HEJFOG::good && analysis->pass_cuts(ev, ev)) {
events.emplace_back(std::move(ev));
}
}
std::cout << std::endl;
+ RHEJ::optional<HEJFOG::Unweighter> unweighter{};
+ if(config.unweight) {
+ unweighter = HEJFOG::Unweighter{
+ begin(events), end(events), config.unweight->max_dev, ran
+ };
+ std::vector<RHEJ::Event> unweighted_events;
+ for(auto && ev: events) {
+ auto unweighted = unweighter->unweight(std::move(ev));
+ if(unweighted) {
+ unweighted_events.emplace_back(std::move(*unweighted));
+ }
+ }
+ events = std::move(unweighted_events);
+ }
const double efficiency = static_cast<double>(events.size())/test_trials;
assert(0. <= efficiency && efficiency <= 1.);
std::cout << "Efficiency: " << efficiency << '\n';
constexpr auto max_trials = std::numeric_limits<long long>::max();
if(max_trials*efficiency < test_trials) {
std::cerr << "Number of required configurations exceeds " << max_trials
<< "\nPlease reduce the number of requested events.\n";
std::cout.setstate(std::ios_base::badbit); // prevent LHAPDF output
return EXIT_FAILURE;
}
const long long total_trials = test_trials/efficiency;
for(auto & ev: events) {
rescale_weights(ev, invGeV2_to_pb/total_trials);
analysis->fill(ev, ev);
writer.write(ev);
if(ev.type() == RHEJ::event_type::FKL){
FKL_xs += ev.central().weight;
FKL_xs_err += ev.central().weight*ev.central().weight;
}
else {
uno_xs += ev.central().weight;
uno_xs_err += ev.central().weight*ev.central().weight;
}
}
const auto warmup_end = clock::now();
const std::chrono::duration<double> warmup_time = warmup_end - warmup_start;
std::cout
<< "Generating " << (total_trials - test_trials) << " additional configurations\n"
"Estimated remaining time: "
<< warmup_time.count()/efficiency << " seconds.\n\n";
HEJFOG::ProgressBar<long long> progress{std::cout, total_trials};
progress.increment(test_trials);
for(int trial = test_trials - 1; trial < total_trials; ++trial){
++progress;
auto ev = generator.gen_event();
++status_counter[generator.status()];
if(generator.status() == HEJFOG::good && analysis->pass_cuts(ev, ev)) {
+ if(unweighter) {
+ auto unweighted = unweighter->unweight(std::move(ev));
+ if(! unweighted) continue;
+ ev = std::move(*unweighted);
+ }
rescale_weights(ev, invGeV2_to_pb/total_trials);
analysis->fill(ev, ev);
writer.write(ev);
if(ev.type() == RHEJ::event_type::FKL){
FKL_xs += ev.central().weight;
FKL_xs_err += ev.central().weight*ev.central().weight;
}
else {
uno_xs += ev.central().weight;
uno_xs_err += ev.central().weight*ev.central().weight;
}
}
}
std::cout << std::endl;
const std::chrono::duration<double> run_time = (clock::now() - start_time);
std::cout << "\nTask Runtime: " << run_time.count() << " seconds.\n";
std::cout.precision(10);
std::cout.width(12);
std::cout.setf(std::ios::fixed);
std::cout
<< "\nCross section: " << (FKL_xs + uno_xs)
<< " +- " << std::sqrt(FKL_xs_err + uno_xs_err) << " (pb)"
"\n FKL: " << FKL_xs << " +- " << std::sqrt(FKL_xs_err) << " (pb)"
"\n unordered: " << uno_xs << " +- " << std::sqrt(uno_xs_err) << " (pb)"
"\n";
std::cout << '\n';
for(auto && entry: status_counter){
const double fraction = static_cast<double>(entry.second)/total_trials;
const int percent = std::round(100*fraction);
std::cout << "status "
<< std::left << std::setw(16) << (to_string(entry.first) + ":")
<< " [";
for(int i = 0; i < percent/2; ++i) std::cout << '#';
for(int i = percent/2; i < 50; ++i) std::cout << ' ';
std::cout << "] " << percent << "%\n";
}
}

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