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fastjet_finder.go
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fastjet_finder.go
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// Copyright 2017 The go-hep Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package fads
import (
"math"
"reflect"
"sort"
"go-hep.org/x/hep/fastjet"
"go-hep.org/x/hep/fmom"
"go-hep.org/x/hep/fwk"
)
// FastJetFinder finds jets using the fastjet library
type FastJetFinder struct {
fwk.TaskBase
input string
output string
rho string
jetDef fastjet.JetDefinition
jetAlg fastjet.JetAlgorithm
paramR float64
jetPtMin float64
coneRadius float64
seedThreshold float64
coneAreaFraction float64
maxIters int
maxPairSize int
iratch int
adjacencyCut int
overlapThreshold float64
// fastjet area method ---
areaDef interface{}
areaAlg int
computeRho bool
// ghost based areas ---
ghostEtaMax float64
repeat int
ghostArea float64
gridScatter float64
ptScatter float64
meanGhostPt float64
// voronoi areas ---
effectiveRfact float64
etaRangeMap map[float64]float64
}
func (tsk *FastJetFinder) Configure(ctx fwk.Context) error {
var err error
err = tsk.DeclInPort(tsk.input, reflect.TypeOf([]Candidate{}))
if err != nil {
return err
}
err = tsk.DeclOutPort(tsk.output, reflect.TypeOf([]Candidate{}))
if err != nil {
return err
}
err = tsk.DeclOutPort(tsk.rho, reflect.TypeOf([]Candidate{}))
if err != nil {
return err
}
if tsk.jetAlg != fastjet.AntiKtAlgorithm {
return fwk.Errorf("fastjet-finder: only implemented for AntiKt")
}
if tsk.areaAlg != 0 {
return fwk.Errorf("fastjet-finder: only implemented with *NO* area-definition")
}
tsk.jetDef = fastjet.NewJetDefinition(tsk.jetAlg, tsk.paramR, fastjet.EScheme, fastjet.BestStrategy)
return err
}
func (tsk *FastJetFinder) StartTask(ctx fwk.Context) error {
var err error
return err
}
func (tsk *FastJetFinder) StopTask(ctx fwk.Context) error {
var err error
return err
}
func (tsk *FastJetFinder) Process(ctx fwk.Context) error {
var err error
store := ctx.Store()
v, err := store.Get(tsk.input)
if err != nil {
return err
}
input := v.([]Candidate)
output := make([]Candidate, 0)
defer func() {
err = store.Put(tsk.output, output)
}()
injets := make([]fastjet.Jet, 0, len(input))
for i := range input {
cand := &input[i]
jet := fastjet.NewJet(cand.Mom.Px(), cand.Mom.Py(), cand.Mom.Pz(), cand.Mom.E())
jet.UserInfo = i
injets = append(injets, jet)
}
// construct jets
var bldr fastjet.Builder
if tsk.areaDef != nil {
// FIXME
panic("not implemented")
} else {
bldr, err = fastjet.NewClusterSequence(injets, tsk.jetDef)
if err != nil {
return err
}
}
// compute rho and store it
if tsk.computeRho {
// FIXME
panic("not implemented")
}
outjets, err := bldr.InclusiveJets(tsk.jetPtMin)
if err != nil {
return err
}
sort.Sort(fastjet.ByPt(outjets))
detaMax := 0.0
dphiMax := 0.0
output = make([]Candidate, 0, len(outjets))
for i := range outjets {
jet := &outjets[i]
area := fmom.PxPyPzE{0, 0, 0, 0}
if tsk.areaDef != nil {
// FIXME
panic("not implemented")
// area = jet.Area()
}
cand := Candidate{
Mom: jet.PxPyPzE,
}
time := 0.0
wtime := 0.0
csts, err := bldr.Constituents(jet)
if err != nil {
return err
}
for j := range csts {
idx := csts[j].UserInfo.(int)
cst := &input[idx]
deta := math.Abs(cand.Mom.Eta() - cst.Mom.Eta())
dphi := math.Abs(fmom.DeltaPhi(&cand.Mom, &cst.Mom))
if deta > detaMax {
detaMax = deta
}
if dphi > dphiMax {
dphiMax = dphi
}
esqrt := math.Sqrt(cst.Mom.E())
time += esqrt * cst.Pos.T()
wtime += esqrt
cand.Add(cst)
}
cand.Pos[3] = time / wtime
cand.Area = area
cand.DEta = detaMax
cand.DPhi = dphiMax
output = append(output, cand)
}
// fmt.Printf("%s: input=%02d outjets=%02d\n", tsk.Name(), len(input), len(output))
return err
}
func newFastJetFinder(typ, name string, mgr fwk.App) (fwk.Component, error) {
var err error
tsk := &FastJetFinder{
TaskBase: fwk.NewTask(typ, name, mgr),
input: "/fads/fastjet/input",
output: "/fads/fastjet/output",
rho: "/fads/fastjet/rho",
jetAlg: fastjet.AntiKtAlgorithm,
paramR: 0.5,
jetPtMin: 10.0,
coneRadius: 0.5,
seedThreshold: 1.0,
coneAreaFraction: 1.0,
maxIters: 100,
maxPairSize: 2,
iratch: 1,
adjacencyCut: 2,
overlapThreshold: 0.75,
// fastjet area method ---
areaDef: nil,
areaAlg: 0,
computeRho: false,
// ghost based areas ---
ghostEtaMax: 5.0,
repeat: 1,
ghostArea: 0.01,
gridScatter: 1.0,
ptScatter: 0.1,
meanGhostPt: 1e-100,
// voronoi areas ---
effectiveRfact: 1.0,
etaRangeMap: make(map[float64]float64),
}
err = tsk.DeclProp("Input", &tsk.input)
if err != nil {
return nil, err
}
err = tsk.DeclProp("Rho", &tsk.rho)
if err != nil {
return nil, err
}
err = tsk.DeclProp("Output", &tsk.output)
if err != nil {
return nil, err
}
err = tsk.DeclProp("JetAlgorithm", &tsk.jetAlg)
if err != nil {
return nil, err
}
err = tsk.DeclProp("ParameterR", &tsk.paramR)
if err != nil {
return nil, err
}
err = tsk.DeclProp("JetPtMin", &tsk.jetPtMin)
if err != nil {
return nil, err
}
err = tsk.DeclProp("ConeRadius", &tsk.coneRadius)
if err != nil {
return nil, err
}
err = tsk.DeclProp("SeedThreshold", &tsk.seedThreshold)
if err != nil {
return nil, err
}
err = tsk.DeclProp("ConeAreaFraction", &tsk.coneAreaFraction)
if err != nil {
return nil, err
}
err = tsk.DeclProp("MaxIterations", &tsk.maxIters)
if err != nil {
return nil, err
}
err = tsk.DeclProp("MaxPairSize", &tsk.maxPairSize)
if err != nil {
return nil, err
}
err = tsk.DeclProp("Iratch", &tsk.iratch)
if err != nil {
return nil, err
}
err = tsk.DeclProp("AdjacencyCut", &tsk.adjacencyCut)
if err != nil {
return nil, err
}
err = tsk.DeclProp("OverlapThreshold", &tsk.overlapThreshold)
if err != nil {
return nil, err
}
err = tsk.DeclProp("AreaAlgorithm", &tsk.areaAlg)
if err != nil {
return nil, err
}
err = tsk.DeclProp("ComputeRho", &tsk.computeRho)
if err != nil {
return nil, err
}
err = tsk.DeclProp("GhostEtaMax", &tsk.ghostEtaMax)
if err != nil {
return nil, err
}
err = tsk.DeclProp("Repeat", &tsk.repeat)
if err != nil {
return nil, err
}
err = tsk.DeclProp("GhostArea", &tsk.ghostArea)
if err != nil {
return nil, err
}
err = tsk.DeclProp("GridScatter", &tsk.gridScatter)
if err != nil {
return nil, err
}
err = tsk.DeclProp("PtScatter", &tsk.ptScatter)
if err != nil {
return nil, err
}
err = tsk.DeclProp("MeanGhostPt", &tsk.meanGhostPt)
if err != nil {
return nil, err
}
err = tsk.DeclProp("EffectiveRfact", &tsk.effectiveRfact)
if err != nil {
return nil, err
}
err = tsk.DeclProp("RhoEtaRange", &tsk.etaRangeMap)
if err != nil {
return nil, err
}
return tsk, err
}
func init() {
fwk.Register(reflect.TypeOf(FastJetFinder{}), newFastJetFinder)
}