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taus_cff.py
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1 import FWCore.ParameterSet.Config as cms
3 from PhysicsTools.JetMCAlgos.TauGenJets_cfi import tauGenJets
4 from PhysicsTools.JetMCAlgos.TauGenJetsDecayModeSelectorAllHadrons_cfi import tauGenJetsSelectorAllHadrons
5 
6 ##################### Updated tau collection with MVA-based tau-Ids rerun #######
7 # Used only in some eras
9 
10 ##################### User floats producers, selectors ##########################
11 
12 
13 finalTaus = cms.EDFilter("PATTauRefSelector",
14  src = cms.InputTag("slimmedTausUpdated"),
15  cut = cms.string("pt > 18 && tauID('decayModeFindingNewDMs') && (tauID('byLooseCombinedIsolationDeltaBetaCorr3Hits') || tauID('byVLooseIsolationMVArun2v1DBoldDMwLT2015') || tauID('byVLooseIsolationMVArun2v1DBnewDMwLT') || tauID('byVLooseIsolationMVArun2v1DBdR03oldDMwLT') || tauID('byVVLooseIsolationMVArun2v1DBoldDMwLT') || tauID('byVVLooseIsolationMVArun2v1DBoldDMwLT2017v2') || tauID('byVVLooseIsolationMVArun2v1DBnewDMwLT2017v2') || tauID('byVVLooseIsolationMVArun2v1DBdR03oldDMwLT2017v2') || tauID('byVVVLooseDeepTau2017v2p1VSjet'))")
16 )
17 
18 from Configuration.Eras.Modifier_run2_nanoAOD_94XMiniAODv1_cff import run2_nanoAOD_94XMiniAODv1
19 for era in [run2_nanoAOD_94XMiniAODv1,]:
20  era.toModify(finalTaus,
21  cut = cms.string("pt > 18 && tauID('decayModeFindingNewDMs') && (tauID('byLooseCombinedIsolationDeltaBetaCorr3Hits') || tauID('byVLooseIsolationMVArun2v1DBoldDMwLT') || tauID('byVLooseIsolationMVArun2v1DBnewDMwLT') || tauID('byVLooseIsolationMVArun2v1DBdR03oldDMwLT') || tauID('byVVLooseIsolationMVArun2v1DBoldDMwLT2017v1') || tauID('byVVLooseIsolationMVArun2v1DBoldDMwLT2017v2') || tauID('byVVLooseIsolationMVArun2v1DBnewDMwLT2017v2') || tauID('byVVLooseIsolationMVArun2v1DBdR03oldDMwLT2017v2') || tauID('byVVVLooseDeepTau2017v2p1VSjet'))")
22  )
23 from Configuration.Eras.Modifier_run2_miniAOD_80XLegacy_cff import run2_miniAOD_80XLegacy
24 run2_miniAOD_80XLegacy.toModify(finalTaus,
25  src = cms.InputTag("slimmedTaus"),
26  cut = cms.string("pt > 18 && tauID('decayModeFindingNewDMs') && (tauID('byLooseCombinedIsolationDeltaBetaCorr3Hits') || tauID('byVLooseIsolationMVArun2v1DBoldDMwLT') || tauID('byVLooseIsolationMVArun2v1DBnewDMwLT') || tauID('byVLooseIsolationMVArun2v1DBdR03oldDMwLT'))")
27  )
28 
29 ##################### Tables for final output and docs ##########################
30 def _tauIdWPMask(pattern, choices, doc=""):
31  return Var(" + ".join(["%d * tauID('%s')" % (pow(2,i), pattern % c) for (i,c) in enumerate(choices)]), "uint8",
32  doc=doc+": bitmask "+", ".join(["%d = %s" % (pow(2,i),c) for (i,c) in enumerate(choices)]))
33 def _tauId2WPMask(pattern,doc):
34  return _tauIdWPMask(pattern,choices=("Loose","Tight"),doc=doc)
35 def _tauId3WPMask(pattern,doc):
36  return _tauIdWPMask(pattern,choices=("Loose","Medium","Tight"),doc=doc)
37 def _tauId4WPMask(pattern,doc):
38  return _tauIdWPMask(pattern, choices=("VLoose", "Loose", "Medium", "Tight"), doc=doc)
39 def _tauId5WPMask(pattern,doc):
40  return _tauIdWPMask(pattern,choices=("VLoose","Loose","Medium","Tight","VTight"),doc=doc)
41 def _tauId6WPMask(pattern,doc):
42  return _tauIdWPMask(pattern,choices=("VLoose","Loose","Medium","Tight","VTight","VVTight"),doc=doc)
43 def _tauId7WPMask(pattern,doc):
44  return _tauIdWPMask(pattern,choices=("VVLoose","VLoose","Loose","Medium","Tight","VTight","VVTight"),doc=doc)
45 def _tauId8WPMask(pattern,doc):
46  return _tauIdWPMask(pattern,choices=("VVVLoose","VVLoose","VLoose","Loose","Medium","Tight","VTight","VVTight"),doc=doc)
47 
48 tauTable = cms.EDProducer("SimpleCandidateFlatTableProducer",
49  src = cms.InputTag("linkedObjects","taus"),
50  cut = cms.string(""), #we should not filter on cross linked collections
51  name= cms.string("Tau"),
52  doc = cms.string("slimmedTaus after basic selection (" + finalTaus.cut.value()+")"),
53  singleton = cms.bool(False), # the number of entries is variable
54  extension = cms.bool(False), # this is the main table for the taus
55  variables = cms.PSet() # PSet defined below in era dependent way
56 )
57 _tauVarsBase = cms.PSet(P4Vars,
58  charge = Var("charge", int, doc="electric charge"),
59  jetIdx = Var("?hasUserCand('jet')?userCand('jet').key():-1", int, doc="index of the associated jet (-1 if none)"),
60  decayMode = Var("decayMode()",int),
61  idDecayMode = Var("tauID('decayModeFinding')", bool),
62  idDecayModeNewDMs = Var("tauID('decayModeFindingNewDMs')", bool),
63 
64  leadTkPtOverTauPt = Var("leadChargedHadrCand.pt/pt ",float, doc="pt of the leading track divided by tau pt",precision=10),
65  leadTkDeltaEta = Var("leadChargedHadrCand.eta - eta ",float, doc="eta of the leading track, minus tau eta",precision=8),
66  leadTkDeltaPhi = Var("deltaPhi(leadChargedHadrCand.phi, phi) ",float, doc="phi of the leading track, minus tau phi",precision=8),
67 
68  dxy = Var("leadChargedHadrCand().dxy()",float, doc="d_{xy} of lead track with respect to PV, in cm (with sign)",precision=10),
69  dz = Var("leadChargedHadrCand().dz()",float, doc="d_{z} of lead track with respect to PV, in cm (with sign)",precision=14),
70 
71  # these are too many, we may have to suppress some
72  rawIso = Var( "tauID('byCombinedIsolationDeltaBetaCorrRaw3Hits')", float, doc = "combined isolation (deltaBeta corrections)", precision=10),
73  rawIsodR03 = Var( "(tauID('chargedIsoPtSumdR03')+max(0.,tauID('neutralIsoPtSumdR03')-0.072*tauID('puCorrPtSum')))", float, doc = "combined isolation (deltaBeta corrections, dR=0.3)", precision=10),
74  chargedIso = Var( "tauID('chargedIsoPtSum')", float, doc = "charged isolation", precision=10),
75  neutralIso = Var( "tauID('neutralIsoPtSum')", float, doc = "neutral (photon) isolation", precision=10),
76  puCorr = Var( "tauID('puCorrPtSum')", float, doc = "pileup correction", precision=10),
77  photonsOutsideSignalCone = Var( "tauID('photonPtSumOutsideSignalCone')", float, doc = "sum of photons outside signal cone", precision=10),
78 
79  idAntiMu = _tauId2WPMask("againstMuon%s3", doc= "Anti-muon discriminator V3: "),
80  idAntiEleDeadECal = Var("tauID('againstElectronDeadECALForNano')", bool, doc = "Anti-electron dead-ECal discriminator"),
81 
82 # isoCI3hit = Var( "tauID("byCombinedIsolationDeltaBetaCorrRaw3Hits")" doc="byCombinedIsolationDeltaBetaCorrRaw3Hits raw output discriminator"),
83 # photonOutsideSigCone = Var( "tauID("photonPtSumOutsideSignalCone")" doc="photonPtSumOutsideSignalCone raw output discriminator"),
84 
85 )
86 
87 _mvaIsoVars2015 = cms.PSet(
88  rawMVAnewDM = Var( "tauID('byIsolationMVArun2v1DBnewDMwLTraw')",float, doc="byIsolationMVArun2v1DBoldDMwLT raw output discriminator (2015)",precision=10),
89  rawMVAoldDM = Var( "tauID('byIsolationMVArun2v1DBoldDMwLTraw')",float, doc="byIsolationMVArun2v1DBoldDMwLT raw output discriminator (2015)",precision=10),
90  rawMVAoldDMdR03 = Var( "tauID('byIsolationMVArun2v1DBdR03oldDMwLTraw')",float, doc="byIsolationMVArun2v1DBoldDMwLT raw output discriminator (2015)",precision=10),
91  idMVAnewDM = _tauId6WPMask( "by%sIsolationMVArun2v1DBnewDMwLT", doc="IsolationMVArun2v1DBnewDMwLT ID working point (2015)"),
92  idMVAoldDM = _tauId6WPMask( "by%sIsolationMVArun2v1DBoldDMwLT", doc="IsolationMVArun2v1DBoldDMwLT ID working point (2015)"),
93  idMVAoldDMdR03 = _tauId6WPMask( "by%sIsolationMVArun2v1DBdR03oldDMwLT", doc="IsolationMVArun2v1DBoldDMdR0p3wLT ID working point (2015)")
94 )
95 _mvaIsoVars2015Reduced = cms.PSet(
96  rawMVAoldDM = Var( "tauID('byIsolationMVArun2v1DBoldDMwLTraw2015')",float, doc="byIsolationMVArun2v1DBoldDMwLT raw output discriminator (2015)",precision=10),
97  idMVAoldDM = _tauId6WPMask( "by%sIsolationMVArun2v1DBoldDMwLT2015", doc="IsolationMVArun2v1DBoldDMwLT ID working point (2015)"),
98 )
99 _mvaIsoVars2017v1 = cms.PSet(
100  rawMVAoldDM2017v1 = Var( "tauID('byIsolationMVArun2v1DBoldDMwLTraw')",float, doc="byIsolationMVArun2v1DBoldDMwLT raw output discriminator (2017v1)",precision=10),
101  idMVAoldDM2017v1 = _tauId7WPMask( "by%sIsolationMVArun2v1DBoldDMwLT", doc="IsolationMVArun2v1DBoldDMwLT ID working point (2017v1)")
102 )
103 _mvaIsoVars2017v2 = cms.PSet(
104  rawMVAnewDM2017v2 = Var( "tauID('byIsolationMVArun2v1DBnewDMwLTraw2017v2')",float, doc="byIsolationMVArun2v1DBnewDMwLT raw output discriminator (2017v2)",precision=10),
105  rawMVAoldDM2017v2 = Var( "tauID('byIsolationMVArun2v1DBoldDMwLTraw2017v2')",float, doc="byIsolationMVArun2v1DBoldDMwLT raw output discriminator (2017v2)",precision=10),
106  rawMVAoldDMdR032017v2 = Var( "tauID('byIsolationMVArun2v1DBdR03oldDMwLTraw2017v2')",float, doc="byIsolationMVArun2v1DBdR03oldDMwLT raw output discriminator (2017v2)",precision=10),
107  idMVAnewDM2017v2 = _tauId7WPMask( "by%sIsolationMVArun2v1DBnewDMwLT2017v2", doc="IsolationMVArun2v1DBnewDMwLT ID working point (2017v2)"),
108  idMVAoldDM2017v2 = _tauId7WPMask( "by%sIsolationMVArun2v1DBoldDMwLT2017v2", doc="IsolationMVArun2v1DBoldDMwLT ID working point (2017v2)"),
109  idMVAoldDMdR032017v2 = _tauId7WPMask( "by%sIsolationMVArun2v1DBdR03oldDMwLT2017v2", doc="IsolationMVArun2v1DBoldDMdR0p3wLT ID working point (2017v2)")
110 )
111 _mvaAntiEVars = cms.PSet(
112  rawAntiEle2018 = Var("tauID('againstElectronMVA6Raw2018')", float, doc= "Anti-electron MVA discriminator V6 raw output discriminator (2018)", precision=10),
113  rawAntiEleCat2018 = Var("tauID('againstElectronMVA6category2018')", int, doc="Anti-electron MVA discriminator V6 category (2018)"),
114  idAntiEle2018 = _tauId5WPMask("againstElectron%sMVA62018", doc= "Anti-electron MVA discriminator V6 (2018)"),
115  rawAntiEle = Var("tauID('againstElectronMVA6Raw')", float, doc= "Anti-electron MVA discriminator V6 raw output discriminator (2015)", precision=10),
116  rawAntiEleCat = Var("tauID('againstElectronMVA6category')", int, doc="Anti-electron MVA discriminator V6 category (2015)"),
117  idAntiEle = _tauId5WPMask("againstElectron%sMVA6", doc= "Anti-electron MVA discriminator V6 (2015)"),
118 )
119 _mvaAntiEVars2015 = cms.PSet(
120  rawAntiEle = Var("tauID('againstElectronMVA6Raw')", float, doc= "Anti-electron MVA discriminator V6 raw output discriminator (2015)", precision=10),
121  rawAntiEleCat = Var("tauID('againstElectronMVA6category')", int, doc="Anti-electron MVA discriminator V6 category (2015)"),
122  idAntiEle = _tauId5WPMask("againstElectron%sMVA6", doc= "Anti-electron MVA discriminator V6 (2015)")
123 )
124 _deepTauVars2017v2 = cms.PSet(
125  rawDeepTau2017v2VSe = Var("tauID('byDeepTau2017v2VSeraw')", float, doc="byDeepTau2017v2VSe raw output discriminator (deepTau2017v2)", precision=10),
126  rawDeepTau2017v2VSmu = Var("tauID('byDeepTau2017v2VSmuraw')", float, doc="byDeepTau2017v2VSmu raw output discriminator (deepTau2017v2)", precision=10),
127  rawDeepTau2017v2VSjet = Var("tauID('byDeepTau2017v2VSjetraw')", float, doc="byDeepTau2017v2VSjet raw output discriminator (deepTau2017v2)", precision=10),
128  idDeepTau2017v2VSe = _tauId8WPMask("by%sDeepTau2017v2VSe", doc="byDeepTau2017v2VSe ID working points (deepTau2017v2)"),
129  idDeepTau2017v2VSmu = _tauId4WPMask("by%sDeepTau2017v2VSmu", doc="byDeepTau2017v2VSmu ID working points (deepTau2017v2)"),
130  idDeepTau2017v2VSjet = _tauId8WPMask("by%sDeepTau2017v2VSjet", doc="byDeepTau2017v2VSjet ID working points (deepTau2017v2)"),
131 )
132 _deepTauVars2017v2p1 = cms.PSet(
133  rawDeepTau2017v2p1VSe = Var("tauID('byDeepTau2017v2p1VSeraw')", float, doc="byDeepTau2017v2p1VSe raw output discriminator (deepTau2017v2p1)", precision=10),
134  rawDeepTau2017v2p1VSmu = Var("tauID('byDeepTau2017v2p1VSmuraw')", float, doc="byDeepTau2017v2p1VSmu raw output discriminator (deepTau2017v2p1)", precision=10),
135  rawDeepTau2017v2p1VSjet = Var("tauID('byDeepTau2017v2p1VSjetraw')", float, doc="byDeepTau2017v2p1VSjet raw output discriminator (deepTau2017v2p1)", precision=10),
136  idDeepTau2017v2p1VSe = _tauId8WPMask("by%sDeepTau2017v2p1VSe", doc="byDeepTau2017v2p1VSe ID working points (deepTau2017v2p1)"),
137  idDeepTau2017v2p1VSmu = _tauId4WPMask("by%sDeepTau2017v2p1VSmu", doc="byDeepTau2017v2p1VSmu ID working points (deepTau2017v2p1)"),
138  idDeepTau2017v2p1VSjet = _tauId8WPMask("by%sDeepTau2017v2p1VSjet", doc="byDeepTau2017v2p1VSjet ID working points (deepTau2017v2p1)"),
139 )
140 
141 _variablesMiniV2 = cms.PSet(
142  _tauVarsBase,
143  _mvaAntiEVars,
144  _mvaIsoVars2015Reduced,
145  _mvaIsoVars2017v1,
146  _mvaIsoVars2017v2,
147  _deepTauVars2017v2p1
148 )
149 _variablesMiniV1 = _variablesMiniV2.clone()
150 _variablesMiniV1.rawMVAoldDM = Var( "tauID('byIsolationMVArun2v1DBoldDMwLTraw')",float, doc="byIsolationMVArun2v1DBoldDMwLT raw output discriminator (2015)",precision=10)
151 _variablesMiniV1.rawMVAoldDM2017v1 = Var( "tauID('byIsolationMVArun2v1DBoldDMwLTraw2017v1')",float, doc="byIsolationMVArun2v1DBoldDMwLT raw output discriminator (2017v1)",precision=10)
152 _variablesMiniV1.idMVAoldDM = _tauId6WPMask( "by%sIsolationMVArun2v1DBoldDMwLT", doc="IsolationMVArun2v1DBoldDMwLT ID working point (2015)")
153 _variablesMiniV1.idMVAoldDM2017v1 = _tauId7WPMask( "by%sIsolationMVArun2v1DBoldDMwLT2017v1", doc="IsolationMVArun2v1DBoldDMwLT ID working point (2017v1)")
154 _variables80X = cms.PSet(
155  _tauVarsBase,
156  _mvaAntiEVars2015,
157  _mvaIsoVars2015
158 )
159 
160 tauTable.variables = _variablesMiniV2
161 
162 for era in [run2_nanoAOD_94XMiniAODv1,]:
163  era.toModify(tauTable,
164  variables = _variablesMiniV1
165  )
166 run2_miniAOD_80XLegacy.toModify(tauTable,
167  variables = _variables80X
168 )
169 run2_miniAOD_80XLegacy.toModify(tauTable.variables,
170  idAntiEleDeadECal = None
171 )
172 
173 run2_miniAOD_devel.toModify(tauTable.variables,
174  idAntiEleDeadECal = Var("tauID('againstElectronDeadECAL')", bool, doc = "Anti-electron dead-ECal discriminator"),
175  rawAntiEle2018 = Var("tauID('againstElectronMVA6Raw')", float, doc= "Anti-electron MVA discriminator V6 raw output discriminator (2018)", precision=10),
176  rawAntiEleCat2018 = Var("tauID('againstElectronMVA6category')", int, doc="Anti-electron MVA discriminator V6 category (2018)"),
177  idAntiEle2018 = _tauId5WPMask("againstElectron%sMVA6", doc= "Anti-electron MVA discriminator V6 (2018)"),
178  rawAntiEle = Var("tauID('againstElectronMVA6Raw2015')", float, doc= "Anti-electron MVA discriminator V6 raw output discriminator (2015)", precision=10),
179  rawAntiEleCat = Var("tauID('againstElectronMVA6category2015')", int, doc="Anti-electron MVA discriminator V6 category (2015"),
180  idAntiEle = _tauId5WPMask("againstElectron%sMVA62015", doc= "Anti-electron MVA discriminator V6 (2015)")
181 )
182 
183 tauGenJets.GenParticles = cms.InputTag("prunedGenParticles")
184 tauGenJets.includeNeutrinos = cms.bool(False)
185 
186 genVisTaus = cms.EDProducer("GenVisTauProducer",
187  src = cms.InputTag("tauGenJetsSelectorAllHadrons"),
188  srcGenParticles = cms.InputTag("prunedGenParticles")
189 )
190 
191 genVisTauTable = cms.EDProducer("SimpleCandidateFlatTableProducer",
192  src = cms.InputTag("genVisTaus"),
193  cut = cms.string("pt > 10."),
194  name = cms.string("GenVisTau"),
195  doc = cms.string("gen hadronic taus "),
196  singleton = cms.bool(False), # the number of entries is variable
197  extension = cms.bool(False), # this is the main table for generator level hadronic tau decays
198  variables = cms.PSet(
199  pt = Var("pt", float,precision=8),
200  phi = Var("phi", float,precision=8),
201  eta = Var("eta", float,precision=8),
202  mass = Var("mass", float,precision=8),
203  charge = Var("charge", int),
204  status = Var("status", int, doc="Hadronic tau decay mode. 0=OneProng0PiZero, 1=OneProng1PiZero, 2=OneProng2PiZero, 10=ThreeProng0PiZero, 11=ThreeProng1PiZero, 15=Other"),
205  genPartIdxMother = Var("?numberOfMothers>0?motherRef(0).key():-1", int, doc="index of the mother particle"),
206  )
207 )
208 
209 tausMCMatchLepTauForTable = cms.EDProducer("MCMatcher", # cut on deltaR, deltaPt/Pt; pick best by deltaR
210  src = tauTable.src, # final reco collection
211  matched = cms.InputTag("finalGenParticles"), # final mc-truth particle collection
212  mcPdgId = cms.vint32(11,13), # one or more PDG ID (11 = electron, 13 = muon); absolute values (see below)
213  checkCharge = cms.bool(False), # True = require RECO and MC objects to have the same charge
214  mcStatus = cms.vint32(), # PYTHIA status code (1 = stable, 2 = shower, 3 = hard scattering)
215  maxDeltaR = cms.double(0.3), # Minimum deltaR for the match
216  maxDPtRel = cms.double(0.5), # Minimum deltaPt/Pt for the match
217  resolveAmbiguities = cms.bool(True), # Forbid two RECO objects to match to the same GEN object
218  resolveByMatchQuality = cms.bool(True), # False = just match input in order; True = pick lowest deltaR pair first
219 )
220 
221 tausMCMatchHadTauForTable = cms.EDProducer("MCMatcher", # cut on deltaR, deltaPt/Pt; pick best by deltaR
222  src = tauTable.src, # final reco collection
223  matched = cms.InputTag("genVisTaus"), # generator level hadronic tau decays
224  mcPdgId = cms.vint32(15), # one or more PDG ID (15 = tau); absolute values (see below)
225  checkCharge = cms.bool(False), # True = require RECO and MC objects to have the same charge
226  mcStatus = cms.vint32(), # CV: no *not* require certain status code for matching (status code corresponds to decay mode for hadronic tau decays)
227  maxDeltaR = cms.double(0.3), # Maximum deltaR for the match
228  maxDPtRel = cms.double(1.), # Maximum deltaPt/Pt for the match
229  resolveAmbiguities = cms.bool(True), # Forbid two RECO objects to match to the same GEN object
230  resolveByMatchQuality = cms.bool(True), # False = just match input in order; True = pick lowest deltaR pair first
231 )
232 
233 tauMCTable = cms.EDProducer("CandMCMatchTableProducer",
234  src = tauTable.src,
235  mcMap = cms.InputTag("tausMCMatchLepTauForTable"),
236  mcMapVisTau = cms.InputTag("tausMCMatchHadTauForTable"),
237  objName = tauTable.name,
238  objType = tauTable.name, #cms.string("Tau"),
239  branchName = cms.string("genPart"),
240  docString = cms.string("MC matching to status==2 taus"),
241 )
242 
243 
244 tauSequence = cms.Sequence(patTauMVAIDsSeq + finalTaus)
245 _tauSequence80X = cms.Sequence(finalTaus)
246 run2_miniAOD_80XLegacy.toReplaceWith(tauSequence,_tauSequence80X)
247 tauTables = cms.Sequence(tauTable)
248 tauMC = cms.Sequence(tauGenJets + tauGenJetsSelectorAllHadrons + genVisTaus + genVisTauTable + tausMCMatchLepTauForTable + tausMCMatchHadTauForTable + tauMCTable)
249 
def _tauId7WPMask(pattern, doc)
Definition: taus_cff.py:43
def _tauId5WPMask(pattern, doc)
Definition: taus_cff.py:39
def _tauId4WPMask(pattern, doc)
Definition: taus_cff.py:37
Updated tau collection with MVA-based tau-Ids rerun ####### Used only in some eras.
def Var(expr, valtype, compression=None, doc=None, mcOnly=False, precision=-1)
Definition: common_cff.py:20
def _tauId3WPMask(pattern, doc)
Definition: taus_cff.py:35
def _tauId6WPMask(pattern, doc)
Definition: taus_cff.py:41
def _tauIdWPMask(pattern, choices, doc="")
Tables for final output and docs ##########################.
Definition: taus_cff.py:30
static std::string join(char **cmd)
Definition: RemoteFile.cc:18
def _tauId2WPMask(pattern, doc)
Definition: taus_cff.py:33
def _tauId8WPMask(pattern, doc)
Definition: taus_cff.py:45
Power< A, B >::type pow(const A &a, const B &b)
Definition: Power.h:40