TrackFitting/src/RefittingAlgorithm.cpp

0001 // This file is part of the Acts project.
0002 //
0003 // Copyright (C) 2023 CERN for the benefit of the Acts project
0004 //
0005 // This Source Code Form is subject to the terms of the Mozilla Public
0006 // License, v. 2.0. If a copy of the MPL was not distributed with this
0007 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
0008
0009 #include "ActsExamples/TrackFitting/RefittingAlgorithm.hpp"
0010
0011 #include "Acts/Definitions/Algebra.hpp"
0012 #include "Acts/EventData/GenericBoundTrackParameters.hpp"
0013 #include "Acts/EventData/MultiTrajectory.hpp"
0014 #include "Acts/EventData/SourceLink.hpp"
0015 #include "Acts/EventData/TrackContainer.hpp"
0016 #include "Acts/EventData/TrackParameters.hpp"
0017 #include "Acts/EventData/TrackProxy.hpp"
0018 #include "Acts/EventData/VectorMultiTrajectory.hpp"
0019 #include "Acts/EventData/VectorTrackContainer.hpp"
0020 #include "Acts/Propagator/Propagator.hpp"
0021 #include "Acts/Surfaces/Surface.hpp"
0022 #include "Acts/Utilities/Result.hpp"
0023 #include "ActsExamples/Framework/AlgorithmContext.hpp"
0024 #include "ActsExamples/TrackFitting/RefittingCalibrator.hpp"
0025 #include "ActsExamples/TrackFitting/TrackFitterFunction.hpp"
0026
0027 #include <functional>
0028 #include <optional>
0029 #include <ostream>
0030 #include <stdexcept>
0031 #include <system_error>
0032 #include <utility>
0033 #include <vector>
0034
0035 ActsExamples::RefittingAlgorithm::RefittingAlgorithm(Config config,
0036                                                      Acts::Logging::Level level)
0037     : ActsExamples::IAlgorithm("TrackFittingAlgorithm", level),
0038       m_cfg(std::move(config)) {
0039   if (m_cfg.inputTracks.empty()) {
0040     throw std::invalid_argument("Missing input tracks collection");
0041   }
0042   if (m_cfg.outputTracks.empty()) {
0043     throw std::invalid_argument("Missing output tracks collection");
0044   }
0045
0046   m_inputTracks.initialize(m_cfg.inputTracks);
0047   m_outputTracks.initialize(m_cfg.outputTracks);
0048 }
0049
0050 ActsExamples::ProcessCode ActsExamples::RefittingAlgorithm::execute(
0051     const ActsExamples::AlgorithmContext& ctx) const {
0052   const auto& inputTracks = m_inputTracks(ctx);
0053
0054   auto trackContainer = std::make_shared<Acts::VectorTrackContainer>();
0055   auto trackStateContainer = std::make_shared<Acts::VectorMultiTrajectory>();
0056   TrackContainer tracks(trackContainer, trackStateContainer);
0057
0058   // Perform the fit for each input track
0059   std::vector<Acts::SourceLink> trackSourceLinks;
0060   std::vector<const Acts::Surface*> surfSequence;
0061   RefittingCalibrator calibrator;
0062
0063   auto itrack = 0ul;
0064   for (const auto& track : inputTracks) {
0065     // Check if you are not in picking mode
0066     if (m_cfg.pickTrack > -1 && m_cfg.pickTrack != static_cast<int>(itrack++)) {
0067       continue;
0068     }
0069
0070     TrackFitterFunction::GeneralFitterOptions options{
0071         ctx.geoContext, ctx.magFieldContext, ctx.calibContext,
0072         &track.referenceSurface(), Acts::PropagatorPlainOptions()};
0073
0074     const Acts::BoundTrackParameters initialParams(
0075         track.referenceSurface().getSharedPtr(), track.parameters(),
0076         track.covariance(), track.particleHypothesis());
0077
0078     trackSourceLinks.clear();
0079     surfSequence.clear();
0080
0081     for (auto state : track.trackStatesReversed()) {
0082       surfSequence.push_back(&state.referenceSurface());
0083
0084       if (!state.hasCalibrated()) {
0085         continue;
0086       }
0087
0088       auto sl = RefittingCalibrator::RefittingSourceLink{state};
0089       trackSourceLinks.push_back(Acts::SourceLink{sl});
0090     }
0091
0092     if (surfSequence.empty()) {
0093       ACTS_WARNING("Empty track " << itrack << " found.");
0094       continue;
0095     }
0096
0097     ACTS_VERBOSE("Initial parameters: "
0098                  << initialParams.fourPosition(ctx.geoContext).transpose()
0099                  << " -> " << initialParams.direction().transpose());
0100
0101     ACTS_DEBUG("Invoke direct fitter for track " << itrack);
0102     auto result = (*m_cfg.fit)(trackSourceLinks, initialParams, options,
0103                                calibrator, surfSequence, tracks);
0104
0105     if (result.ok()) {
0106       // Get the fit output object
0107       const auto& refittedTrack = result.value();
0108       if (refittedTrack.hasReferenceSurface()) {
0109         ACTS_VERBOSE("Refitted parameters for track " << itrack);
0110         ACTS_VERBOSE("  " << track.parameters().transpose());
0111       } else {
0112         ACTS_DEBUG("No refitted parameters for track " << itrack);
0113       }
0114     } else {
0115       ACTS_WARNING("Fit failed for track "
0116                    << itrack << " with error: " << result.error() << ", "
0117                    << result.error().message());
0118     }
0119   }
0120
0121   std::stringstream ss;
0122   trackStateContainer->statistics().toStream(ss);
0123   ACTS_DEBUG(ss.str());
0124
0125   ConstTrackContainer constTracks{
0126       std::make_shared<Acts::ConstVectorTrackContainer>(
0127           std::move(*trackContainer)),
0128       std::make_shared<Acts::ConstVectorMultiTrajectory>(
0129           std::move(*trackStateContainer))};
0130
0131   m_outputTracks(ctx, std::move(constTracks));
0132   return ActsExamples::ProcessCode::SUCCESS;
0133 }