Herwig7ConfigMerging.Hw7ConfigMerging Class Reference

Configuration class for Matchbox runs with Herwig7. More...

Inheritance diagram for Herwig7ConfigMerging.Hw7ConfigMerging:

Collaboration diagram for Herwig7ConfigMerging.Hw7ConfigMerging:

Public Member Functions
def	__init__ (self, genSeq, runArgs, run_name="Herwig", beams="pp")
	Initialize a generator configuration object for the Matchbox run mode. More...
def	local_pre_commands (self)
def	local_post_commands (self)
def	run (self, integration_jobs=1, gridpack=None, cleanup_herwig_scratch=True)
	High-level function for triggering the process setup and the event generation. More...
def	do_build (self, integration_jobs)
	Atomic steering function for doing the build step alone. More...
def	do_integrate (self, integration_job)
	Atomic steering function for doing one specific integration job. More...
def	do_mergegrids (self, integration_jobs, gridpack=None)
	Atomic steering function for combining the integration grids and possibly creating a gridpack. More...
def	do_run (self, gridpack=None, cleanup_herwig_scratch=True)
	Atomic steering function for possibly unpacking a gridpack and generating events. More...
def	sampler_commands (self, bin_sampler="CellGridSampler", initial_points=10000, n_iterations=1, remapper_points=50000, exploration_steps=4, exploration_points=500)
	Configure the sampler. More...
def	merging_weight (self, htPower=0, maxPtPower=0, onlyColoured="No")

Public Attributes
	beams
	provide variables initialized by the parent class More...

Private Member Functions
def	__configure (self)

Detailed Description

Configuration class for Matchbox runs with Herwig7.

Example JobOptions are available in examples/Matchbox and tests/athenaMatchbox/jobOptions.

Process Setup and Generator Configuration

To use the Matchbox run mode of Herwig7 load the corresponding modules and add Herwig7 to the generator sequence

from Herwig7_i.Herwig7_iConf import Herwig7
from Herwig7_i.Herwig7ConfigMatchbox import Hw7ConfigMatchbox
 
genSeq += Herwig7()

You may specify details of the run a la

# Provide config information
evgenConfig.generators += ["Herwig7"]
evgenConfig.tune        = "MMHT2014"
evgenConfig.description = "Herwig7 Zee sample with CT10 ME PDF and MMHT2014 PS and UE tune"
evgenConfig.keywords    = ["SM","Z","electron"]
evgenConfig.contact     = ["Your Name (your.name@cern.ch)"]

You can initialize a generator configuration object with

# initialize generator configuration object
generator = Hw7ConfigMatchbox(genSeq, runArgs, run_name="HerwigMatchbox", beams="pp")

Please see the constructor for more information on the arguments.

You can use the functions me_alphas_commands, me_pdf_commands and tune_commands from Herwig7Config::Hw7Config to configure the strong coupling and the PDFs for the hard process and the parton shower and underlying event tunes, e.g.

# configure generator
generator.me_pdf_commands(order="NLO", name="CT10")
generator.tune_commands()

You can add direct Herwig7 commands like this

generator.add_commands("""
 
# Model assumptions
read Matchbox/StandardModelLike.in
 
# Set the hard process
set /Herwig/MatrixElements/Matchbox/Factory:OrderInAlphaS 0
set /Herwig/MatrixElements/Matchbox/Factory:OrderInAlphaEW 2
do /Herwig/MatrixElements/Matchbox/Factory:Process p p -> e+ e-
 
# Cut selection (see the documentation for more options)
set /Herwig/Cuts/ChargedLeptonPairMassCut:MinMass 60*GeV
set /Herwig/Cuts/ChargedLeptonPairMassCut:MaxMass 120*GeV
 
# Scale choice (see the documentation for more options)
cd /Herwig/MatrixElements/Matchbox
set Factory:ScaleChoice /Herwig/MatrixElements/Matchbox/Scales/LeptonPairMassScale
 
# Matching and shower selection
read Matchbox/MCatNLO-DefaultShower.in
 
# Choose a flavour scheme
read Matchbox/FiveFlavourScheme.in
""")

Please see the Herwig7 tutorial page for in-depth information on the different settings and have a look at Herwig7ConfigMatchbox::Hw7ConfigMatchbox and Herwig7Config::Hw7Config to see if there are convenience functions that accomplish the task provided in the interface already.

Integration and Event Generation

To trigger the actual running of Herwig7 in Athena please end the JobOptions with

# run the generator
generator.run()

More specifically, the run() function triggers the creation of the Herwig7 input file and the preparation of the run (i.e. the Herwig [build, integrate, mergegrids] sequence). This means, that no Herwig7 settings should be modified after calling the run() function because the changed settings would not be applied during the event generation.

Cleanup After the Event Generation

By default the folder Herwig-scratch which created by Herwig7 and contains the process libraries and several other files (e.g. integration grids) will be cleaned up and deleted after the event generation in order to save disk space. You can prevent this with:

# run the generator
generator.run(cleanup_herwig_scratch=True)

Parallel Integration

Machine-local parallelization of the integration can be achieved with

# run the generator
generator.run(integration_jobs=2)

Generate_tf.py comes with the command line parameter --generatorJobNumber that can be used to specify the number of integration jobs dynamically, instead of fixing it in the JobOptions

# run the generator
generator.run(integration_jobs=runArgs.generatorJobNumber)

Gridpacks

A gridpack can be created with

# run the generator
generator.run(gridpack="gridpack.tar.gz")

The JobOptions can be run in athena with a command such as

Generate_tf.py --jobConfig=MC15.999999.H7_MB_Int_Zee_MCatLO_QTilde_H7_UE_MMHT2014.py --runNumber=999999 --ecmEnergy=13000 --randomSeed=12011988 --maxEvents=100 --outputEVNTFile=evgen.root

If you have previously created a gridpack called gridpack.tar.gz and want to generate events from it, specify the name of the compressed gridpack using the --inputGenConfFile command line parameter, e.g.

Generate_tf.py --jobConfig=MC15.999999.H7_MB_Int_Zee_MCatLO_QTilde_H7_UE_MMHT2014.py --inputGenConfFile=gridpack.tar.gz --runNumber=999999 --ecmEnergy=13000 --randomSeed=12011988 --maxEvents=100 --outputEVNTFile=evgen.root

Full Flexibility and Batch-Parallel Integration

The --generatorRunMode command line argument for Generate_tf.py can be used to put in place a very fine-grained control over the various steps that happen before the event generation.

In the following example this is combined with the creation and use of a gridpack. This, however, doesn't have to be done and can be left out.

if runArgs.generatorRunMode == 'build':
  # use the --generatorJobNumber command line parameter to dynamically
  # specify the total number of parallel integration jobs
  generator.do_build(integration_jobs=runArgs.generatorJobNumber)
 
elif runArgs.generatorRunMode == 'integrate':
  # use the --generatorJobNumber command line parameter to dynamically
  # specify which specific integration job is to be run
  generator.do_integrate(runArgs.generatorJobNumber)
 
elif runArgs.generatorRunMode == 'mergegrids':
  # combine integration grids and prepare a gridpack
  # use the --generatorJobNumber command line parameter to dynamically
  # specify the total number of parallel integration jobs
  generator.do_mergegrids(integration_jobs=runArgs.generatorJobNumber, gridpack="gridpack.tar.gz")
 
elif runArgs.generatorRunMode == 'run':
  # generate events using the specified gridpack
  generator.do_run(gridpack="gridpack.tar.gz")

Please note that for the do_build() function the same caveat applies as for the run() function: The Herwig7 generator configuration should not be modified afterwards in the job options as the new settings would not be applied in the event generation.

Note

Currently the build, the integration and the mergegrids steps have to run in the same directory which means that the files written by athena will be re-created and overwritten. In one of the next releases Herwig7 will bring infrastructure to re-use Herwig-scratch folders from a different location which will allow for a full batch parallelization of the integration in athena.

Definition at line 210 of file Herwig7ConfigMerging.py.

Constructor & Destructor Documentation

__init__()

def Herwig7ConfigMerging.Hw7ConfigMerging.__init__	(		self,
			genSeq,
			runArgs,
			run_name = "Herwig",
			beams = "pp"
	)

Initialize a generator configuration object for the Matchbox run mode.

Definition at line 214 of file Herwig7ConfigMerging.py.

  def __init__(self, genSeq, runArgs, run_name="Herwig", beams="pp"):
 
    beams = beams.upper()
    if beams not in ["EE", "EP", "PP"]:
      raise RuntimeError(hw7Utils.ansi_format_error("Parameter 'beams' must be one of the following ['EE', 'EP', 'PP']!"))
 
    
    super(Hw7ConfigMerging, self).__init__(genSeq, runArgs, run_name)
 
    self.beams = beams
 
 

Member Function Documentation

__configure()

def Herwig7ConfigMerging.Hw7ConfigMerging.__configure (   self )

private

Definition at line 298 of file Herwig7ConfigMerging.py.

  def __configure(self):
 
    
 
    self.default_commands += self.energy_commands()
    self.default_commands += self.random_seed_commands()
    
    if not self.set_printout_commands:
      self.default_commands += self.printout_commands()
    if not self.set_physics_parameter_commands:
      self.default_commands += self.physics_parameter_commands()
    if not self.set_technical_parameter_commands:
      self.default_commands += self.technical_parameter_commands()
 
 

do_build()

def Herwig7ConfigMerging.Hw7ConfigMerging.do_build	(		self,
			integration_jobs
	)

Atomic steering function for doing the build step alone.

Parameters

[in]

integration_jobs

Number of integration jobs to be prepared

Warning

Please do not modify the generator configuration in the job options after calling the do_build() function as the modified settings would not be applied in the event generation

Definition at line 347 of file Herwig7ConfigMerging.py.

  def do_build(self, integration_jobs):
    self.__configure()
    hw7Control.do_build(self, integration_jobs)
    hw7Control.do_abort()
 

do_integrate()

def Herwig7ConfigMerging.Hw7ConfigMerging.do_integrate	(		self,
			integration_job
	)

Atomic steering function for doing one specific integration job.

Todo:

provide info about the range

Definition at line 354 of file Herwig7ConfigMerging.py.

  def do_integrate(self, integration_job):
    hw7Control.do_integrate(self.run_name, integration_job)
    hw7Control.do_abort()
 

do_mergegrids()

def Herwig7ConfigMerging.Hw7ConfigMerging.do_mergegrids	(		self,
			integration_jobs,
			gridpack = None
	)

Atomic steering function for combining the integration grids and possibly creating a gridpack.

Parameters

[in]	integration_jobs	Number of integration jobs
[in]	gridpack	Name of the gridpack to be created. No gridpack is created if the parameter is not specified.

Definition at line 363 of file Herwig7ConfigMerging.py.

  def do_mergegrids(self, integration_jobs, gridpack=None):
    hw7Control.do_mergegrids(self.run_name, integration_jobs)
    if gridpack:
      hw7Control.do_compress_gridpack(self.run_name, gridpack)
    hw7Control.do_abort()
 

do_run()

def Herwig7ConfigMerging.Hw7ConfigMerging.do_run	(		self,
			gridpack = None,
			cleanup_herwig_scratch = True
	)

Atomic steering function for possibly unpacking a gridpack and generating events.

Parameters

[in]	gridpack	Name of the gridpack to be used. No gridpack is used if the parameter is not specified.
[in]	cleanup_herwig_scratch	Remove the Herwig-scratch folder after event generation to save disk space

Definition at line 374 of file Herwig7ConfigMerging.py.

  def do_run(self, gridpack=None, cleanup_herwig_scratch=True):
    if gridpack:
      hw7Control.do_uncompress_gridpack(gridpack)
    hw7Control.do_run(self, cleanup_herwig_scratch)
 
 

local_post_commands()

def Herwig7ConfigMerging.Hw7ConfigMerging.local_post_commands

(

self

)

Definition at line 286 of file Herwig7ConfigMerging.py.

  def local_post_commands(self):
 
    return """
## =================================================
## Local Post-Commands from Herwig7ConfigMerging.py
## =================================================
 
do /Herwig/Merging/MergingFactory:ProductionMode
saverun {} /Herwig/Generators/EventGenerator
""".format(self.run_name)
 
 

local_pre_commands()

def Herwig7ConfigMerging.Hw7ConfigMerging.local_pre_commands

(

self

)

Definition at line 226 of file Herwig7ConfigMerging.py.

  def local_pre_commands(self):
 
    # try to locate the MG5_aMC@NLO installation
    try:
      MG5aMC_path = os.environ['MADPATH']
    except KeyError:
      raise RuntimeError("MADPATH environment variable not set")
    if not os.path.isfile(os.path.join(MG5aMC_path, 'bin', 'mg5_aMC')):
      athMsgLog.warn(hw7Utils.ansi_format_warning("The MadGraph5_aMC@NLO installation can't be found from $MADPATH = {}, so don't be surprised if your run crashes in you are using matrix elements from MG5_aMC@NLO in Herwig7 / Matchbox. Please ensure that the location exists, that you have permissions to access it and that it contains the executable 'bin/mg5_aMC'".format(MG5aMC_path)))
 
    # try to locate the GoSam installation
    try:
      GoSam_path = os.environ['GOSAM_PATH']
    except KeyError:
      raise RuntimeError("GOSAM_PATH environment variable not set")
    if not os.path.isfile(os.path.join(GoSam_path, 'bin', 'gosam.py')):
      athMsgLog.warn(hw7Utils.ansi_format_warning("The GoSam installation can't be found from $GOSAMPATH = {}, so don't be surprised if your run crashes in you are using matrix elements from GoSam in Herwig7 / Matchbox. Please ensure that the location exists, that you have permissions to access it and that it contains the script 'bin/gosam.py'".format(GoSam_path)))
 
    try:
      OpenLoops_path= os.environ['OPENLOOPSPATH']
    except KeyError:
      raise RuntimeError("OPENLOOPSPATH environment variable not set")
    if not os.path.isdir(os.path.join(OpenLoops_path, "proclib")):
      athMsgLog.warn(hw7Utils.ansi_format_warning("The OpenLoops process libraries can't be found from $OPENLOOPSPATH = {}".format(OpenLoops_path)))
 
 
      
    return """
## ================================================
## Local Pre-Commands from Herwig7ConfigMerging.py
## ================================================
 
## Fixing interface locations for MadGraph
set /Herwig/MatrixElements/Matchbox/Amplitudes/MadGraph:BinDir {0}
set /Herwig/MatrixElements/Matchbox/Amplitudes/MadGraph:DataDir {1}
set /Herwig/MatrixElements/Matchbox/Amplitudes/MadGraph:MadgraphPrefix {2}
 
## Fixing interface locations for GoSam
set /Herwig/MatrixElements/Matchbox/Amplitudes/GoSam:BinDir {0}
set /Herwig/MatrixElements/Matchbox/Amplitudes/GoSam:DataDir {1}
set /Herwig/MatrixElements/Matchbox/Amplitudes/GoSam:GoSamPrefix {3}
 
##Fixing interface locations of Openloops
set /Herwig/MatrixElements/Matchbox/Amplitudes/OpenLoops:OpenLoopsLibs {5}
set /Herwig/MatrixElements/Matchbox/Amplitudes/OpenLoops:OpenLoopsPrefix {6}    
 
# Currently the Dipole Snippet is broken (reads to the Rivet interface which we don't build)
# For now manually copy all the relevant settings in
read snippets/DipoleMerging.in
read snippets/{4}Collider.in
read Merging/Merging-Dipole-FactorCMWSchemeTune.in
read Merging/FactorCMWScheme.in
""".format(hw7Control.herwig7_bin_path,
           hw7Control.herwig7_share_path,
           MG5aMC_path,
           GoSam_path,
           self.beams,
           os.path.join(OpenLoops_path,"proclib"),
           OpenLoops_path)
 

merging_weight()

def Herwig7ConfigMerging.Hw7ConfigMerging.merging_weight	(		self,
			htPower = 0,
			maxPtPower = 0,
			onlyColoured = "No"
	)

Definition at line 424 of file Herwig7ConfigMerging.py.

  def merging_weight(self, htPower=0, maxPtPower=0, onlyColoured="No"):
    if onlyColoured not in ["Yes","No"]:
      raise RuntimeError(hw7Utils.ansi_format_error("OnlyColoured must be Yes or No"))
 
    self.commands+="""
##Merging Weighter for better phase space coverage
set /Herwig/Merging/MPreWeight:HTPower {}
set /Herwig/Merging/MPreWeight:MaxPTPower {}
set /Herwig/Merging/MPreWeight:OnlyColoured {}
""".format(htPower,maxPtPower,onlyColoured)
 

run()

def Herwig7ConfigMerging.Hw7ConfigMerging.run	(		self,
			integration_jobs = 1,
			gridpack = None,
			cleanup_herwig_scratch = True
	)

High-level function for triggering the process setup and the event generation.

Parameters

[in]	integration_jobs	Number of threads for machine-local parallelization of the integration
[in]	gridpack	Name of the gridpack that possibly is to be created (after the integration) or to be used (for the event generation). No gridpack is created or used if the parameter is not specified. If you have created a gridpack and would like to generate events from it, please pass the name of the gridpack to the Generate_tf.py command using the --inputGenConfFile command line argument
[in]	cleanup_herwig_scratch	Remove the Herwig-scratch folder after event generation to save disk space

Warning

Please do not modify the generator configuration in the job options after calling the run() function as the modified settings would not be applied in the event generation

Definition at line 328 of file Herwig7ConfigMerging.py.

  def run(self, integration_jobs=1, gridpack=None, cleanup_herwig_scratch=True):
 
    self.__configure()
 
    if gridpack:
      hw7Control.matchbox_run_gridpack(self, integration_jobs, gridpack, cleanup_herwig_scratch)
    else:
      hw7Control.matchbox_run(self, integration_jobs, cleanup_herwig_scratch)
 
 

sampler_commands()

def Herwig7ConfigMerging.Hw7ConfigMerging.sampler_commands	(		self,
			bin_sampler = "CellGridSampler",
			initial_points = 10000,
			n_iterations = 1,
			remapper_points = 50000,
			exploration_steps = 4,
			exploration_points = 500
	)

Configure the sampler.

Warning

Please be very careful when modifying the sampler settings and ensure that the statistics in the integration phase is sufficient to provide an adequate phase space sampling and setup. The total cross section estimated after the integration is output before the event generation, please watch out for the corresponding lines beginning with

Py:Herwig7Utils      INFO Calculating cross section after integration

If the statistical uncertainty on this estimated total cross section is larger than 0.2% a warning is printed, encouraging you to consider increasing the statistics of the integration.

Definition at line 397 of file Herwig7ConfigMerging.py.

  def sampler_commands(self, bin_sampler="CellGridSampler",
                       initial_points=10000, n_iterations=1, remapper_points=50000,
                       exploration_steps=4, exploration_points=500):
 
    bin_samplers = ["CellGridSampler", "MonacoSampler", "FlatBinSampler"]
 
    if bin_sampler not in bin_samplers:
      raise RuntimeError(hw7Utils.ansi_format_error("Parameter 'bin_sampler' must be one of {}!".format(bin_samplers)))
 
    self.commands += """
## Sampler Configuration
set /Herwig/Samplers/Sampler:BinSampler /Herwig/Samplers/{}
set /Herwig/Samplers/Sampler:BinSampler:InitialPoints {}
set /Herwig/Samplers/Sampler:BinSampler:NIterations {}
set /Herwig/Samplers/Sampler:BinSampler:RemapperPoints {}
""".format(bin_sampler, initial_points, n_iterations, remapper_points)
 
    if bin_sampler == "CellGridSampler":
      self.commands += """
set /Herwig/Samplers/CellGridSampler:ExplorationSteps {}
set /Herwig/Samplers/CellGridSampler:ExplorationPoints {}
""".format(exploration_steps, exploration_points)
 
    if bin_sampler == "MonacoSampler":
      self.commands += """
read snippets/MonacoSampler.in"""
 

Member Data Documentation

beams

Herwig7ConfigMerging.Hw7ConfigMerging.beams

provide variables initialized by the parent class

Definition at line 223 of file Herwig7ConfigMerging.py.

---

The documentation for this class was generated from the following file:

• Herwig7ConfigMerging.py