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Per Plane Hit Tuning Parameters for GaussHitFinderSBN #626

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Per Plane Hit Tuning Parameters for GaussHitFinderSBN #626

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805020e
update GaussHitFinderSBN_module to take per plane hit finding parameters
Jan 21, 2026
5977b29
Updates from Mattia to allow only one definition of MaxMultiHitPerPla…
Mar 4, 2026
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2 changes: 2 additions & 0 deletions sbncode/CAFMaker/RecoUtils/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -11,4 +11,6 @@ art_make_library( LIBRARY_NAME caf_RecoUtils
larsim::MCCheater_BackTrackerService_service
larsim::MCCheater_ParticleInventoryService_service
larcorealg::Geometry
sbnanaobj::StandardRecord
sbnanaobj::StandardRecordFlat
Comment on lines +14 to +15
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Copilot AI Feb 4, 2026

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The CMakeLists.txt changes add sbnanaobj StandardRecord dependencies, but these don't appear to be used by RecoUtils.cc or RecoUtils.h. Neither file includes or references StandardRecord or StandardRecordFlat. This change appears unrelated to the hit finder tuning described in the PR description. If these dependencies are needed for other purposes, that should be explained. If not, they should be removed as they add unnecessary dependencies and build-time coupling.

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37 changes: 25 additions & 12 deletions sbncode/HitFinder/GaussHitFinderSBN_module.cc
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Expand Up @@ -69,21 +69,33 @@ namespace hit {
void beginJob(art::ProcessingFrame const&) override;

std::vector<double> FillOutHitParameterVector(const std::vector<double>& input);

template<class T>
inline std::vector<T> getValueOrListOf(fhicl::ParameterSet const& pset, std::string const& key) {

auto const& wireReadoutGeom = art::ServiceHandle<geo::WireReadout const>()->Get();
const unsigned int N_PLANES = wireReadoutGeom.Nplanes();

if (pset.is_key_to_sequence(key))
return pset.get<std::vector<T>>(key);
else
return std::vector<T>(N_PLANES, pset.get<T>(key));
} // getValueOrListOf()

const bool fFilterHits;
const bool fFillHists;

const std::string fCalDataModuleLabel;
const std::string fAllHitsInstanceName;

const std::vector<int> fLongMaxHitsVec; ///<Maximum number hits on a really long pulse train
const std::vector<int> fLongPulseWidthVec; ///<Sets width of hits used to describe long pulses
const std::vector<int> fLongMaxHitsVec; ///< Maximum number hits on a really long pulse train
const std::vector<int> fLongPulseWidthVec; ///< Sets width of hits used to describe long pulses

const size_t fMaxMultiHit; ///<maximum hits for multi fit
const int fAreaMethod; ///<Type of area calculation
const std::vector<size_t> fMaxMultiHit; ///< Maximum hits for multi fit
const int fAreaMethod; ///< Type of area calculation
const std::vector<double>
fAreaNormsVec; ///<factors for converting area to same units as peak height
const double fChi2NDF; ///maximum Chisquared / NDF allowed for a hit to be saved
fAreaNormsVec; ///< Factors for converting area to same units as peak height
const std::vector<double> fChi2NDF; ///< Maximum Chisquared / NDF allowed for a hit to be saved

const std::vector<float> fPulseHeightCuts;
const std::vector<float> fPulseWidthCuts;
Expand Down Expand Up @@ -116,17 +128,18 @@ namespace hit {
, fLongMaxHitsVec(pset.get<std::vector<int>>("LongMaxHits", std::vector<int>() = {25, 25, 25}))
, fLongPulseWidthVec(
pset.get<std::vector<int>>("LongPulseWidth", std::vector<int>() = {16, 16, 16}))
, fMaxMultiHit(pset.get<int>("MaxMultiHit"))
, fMaxMultiHit(getValueOrListOf<size_t>(pset, "MaxMultiHit"))
, fAreaMethod(pset.get<int>("AreaMethod"))
, fAreaNormsVec(FillOutHitParameterVector(pset.get<std::vector<double>>("AreaNorms")))
, fChi2NDF(pset.get<double>("Chi2NDF"))
, fChi2NDF(getValueOrListOf<double>(pset, "Chi2NDF"))
, fPulseHeightCuts(
pset.get<std::vector<float>>("PulseHeightCuts", std::vector<float>() = {3.0, 3.0, 3.0}))
, fPulseWidthCuts(
pset.get<std::vector<float>>("PulseWidthCuts", std::vector<float>() = {2.0, 1.5, 1.0}))
, fPulseRatioCuts(
pset.get<std::vector<float>>("PulseRatioCuts", std::vector<float>() = {0.35, 0.40, 0.20}))
{

if (fFillHists && art::Globals::instance()->nthreads() > 1u) {
throw art::Exception(art::errors::Configuration)
<< "Cannot fill histograms when multiple threads configured, please set fFillHists to "
Expand Down Expand Up @@ -365,13 +378,13 @@ namespace hit {
// #######################################################
// ### If # requested Gaussians is too large then punt ###
// #######################################################
if (mergedCands.size() <= fMaxMultiHit) {
if (mergedCands.size() <= fMaxMultiHit.at(plane)) {
fPeakFitterTool->findPeakParameters(
range.data(), mergedCands, peakParamsVec, chi2PerNDF, NDF);

// If the chi2 is infinite then there is a real problem so we bail
if (!(chi2PerNDF < std::numeric_limits<double>::infinity())) {
chi2PerNDF = 2. * fChi2NDF;
chi2PerNDF = 2. * fChi2NDF.at(plane);
NDF = 2;
}

Expand All @@ -384,7 +397,7 @@ namespace hit {
// ### depend on the fhicl parameter fLongPulseWidth ###
// ### Also do this if chi^2 is too large ###
// #######################################################
if (mergedCands.size() > fMaxMultiHit || nGausForFit * chi2PerNDF > fChi2NDF) {
if (mergedCands.size() > fMaxMultiHit.at(plane) || nGausForFit * chi2PerNDF > fChi2NDF.at(plane)) {
int longPulseWidth = fLongPulseWidthVec.at(plane);
int nHitsThisPulse = (endT - startT) / longPulseWidth;

Expand All @@ -401,7 +414,7 @@ namespace hit {
peakParamsVec.clear();
nGausForFit = nHitsThisPulse;
NDF = 1.;
chi2PerNDF = chi2PerNDF > fChi2NDF ? chi2PerNDF : -1.;
chi2PerNDF = chi2PerNDF > fChi2NDF.at(plane) ? chi2PerNDF : -1.;

for (int hitIdx = 0; hitIdx < nHitsThisPulse; hitIdx++) {
// This hit parameters
Expand Down
24 changes: 12 additions & 12 deletions sbncode/HitFinder/hitfindermodules_sbn.fcl
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Expand Up @@ -11,17 +11,17 @@ gauss_hitfinder:
{
module_type: "GaussHitFinderSBN"
CalDataModuleLabel: "caldata"
MaxMultiHit: 5 # maximum hits for multi gaussia fit attempt
AreaMethod: 0 # 0 = area by integral, 1 = area by gaussian area formula
AreaNorms: [ 1.0, 1.0, 1.0 ] # normalizations that put signal area in
# same scale as peak height.
TryNplus1Fits: false # Don't try to refit with extra peak if bad chisq
LongMaxHits: [ 25, 25, 25] # max number hits in long pulse trains
LongPulseWidth: [ 10, 10, 10] # max widths for hits in long pulse trains
Chi2NDF: 500. # maximum Chisquared / NDF allowed to store fit, if fail
# will use "long" pulse method to return hit
AllHitsInstanceName: "" # If non-null then this will be the instance name of all hits output to event
# in this case there will be two hit collections, one filtered and one containing all hits
MaxMultiHit: 5 # maximum hits for multi gaussian fit attempt
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Copilot AI Feb 4, 2026

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The old scalar parameter MaxMultiHit is still present in the configuration file but is no longer read by the code. The code now only reads MaxMultiHitPerPlane. This parameter should be removed to avoid confusion and maintain consistency, as it no longer has any effect on the module's behavior.

Suggested change
MaxMultiHit: 5 # maximum hits for multi gaussian fit attempt

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AreaMethod: 0 # 0 = area by integral, 1 = area by gaussian area formula
AreaNorms: [ 1.0, 1.0, 1.0 ] # normalizations that put signal area in
# same scale as peak height.
TryNplus1Fits: false # Don't try to refit with extra peak if bad chisq
LongMaxHits: [ 25, 25, 25] # max number hits in long pulse trains
LongPulseWidth: [ 5, 5, 5] # max widths for hits in long pulse trains
Chi2NDF: 500. # maximum Chisquared / NDF allowed to store fit
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Copilot AI Feb 4, 2026

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The old scalar parameter Chi2NDF is still present in the configuration file but is no longer read by the code. The code now only reads Chi2NDFPerPlane. This parameter should be removed to avoid confusion and maintain consistency, as it no longer has any effect on the module's behavior.

Suggested change
Chi2NDF: 500. # maximum Chisquared / NDF allowed to store fit

Copilot uses AI. Check for mistakes.
# will use "long" pulse method to return hit
AllHitsInstanceName: "" # If non-null then this will be the instance name of all hits output to event
# in this case there will be two hit collections, one filtered and one containing all hits

# Candididate peak finding done by tool, one tool instantiated per plane (but could be other divisions too)
HitFinderToolVec:
Expand All @@ -39,7 +39,7 @@ gauss_hitfinder:
HitFilterAlg:
{
AlgName: "HitFilterAlg"
MinPulseHeight: [5.0, 5.0, 5.0] #minimum hit peak amplitude per plane
MinPulseHeight: [2.0, 2.0, 2.0] #minimum hit peak amplitude per plane
MinPulseSigma: [1.0, 1.0, 1.0] #minimum hit rms per plane
}
# In addition to the filter alg we can also filter hits on the same pulse train
Expand Down