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generatorProducer.py

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import FWCore.ParameterSet.Config as cms

def customise(process):
        process.RandomNumberGeneratorService.generator = process.RandomNumberGeneratorService.theSource

        process.genParticles.abortOnUnknownPDGCode = False
        process.genParticles.src = 'generator'
        process.genParticleCandidates.src = 'generator'
        process.genEventWeight.src = 'generator'
        process.genEventScale.src = 'generator'
        process.genEventPdfInfo.src = 'generator'
        try:
                process.genEventProcID.src = 'generator'
        except:
                pass

        process.VtxSmeared.src = 'generator'

        try:
                process.g4SimHits.Generator.HepMCProductLabel = 'generator'
                process.mergedtruth.HepMCDataLabels.append('generator')
        except:
                pass

        process.output.outputCommands.append('keep *_source_*_*')
        process.output.outputCommands.append('keep *_generator_*_*')

        return process

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