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Pgrapher Reference Configuration

This area holds a set of reference configuration files that target configuring a WCT job running a graph execution engine such as Pgrapher or TbbFlow. These are expected to provide a set of examples or a starting point for deriving production configuration. See also layers for a new approach to configuration that strives to be generic across many detectors.

Organization

The reference configuration files are factored into sub-directories according to their scope of use.

./ui/
configuration which targets a specific user interface (eg ./ui/cli/ and ./ui/wcls)
./common/
“base objects” and other structures and functions shared by the other scopes. Be very careful changing things here as it will impact each experiments output.
./experiment/
reference configuration specific to one experiment or detector (eg ./experiment/uboone/)
./test/
follows WCT testing conventions and of course with an emphasis on Jsonnet tests.

Guidelines for developing specific configuration

These reference configurations may be used as a basis for developing user and/or production configuration. Some guidelines are given for their effective use

  • clone this wire-cell-cfg repository but otherwise leave its contents unmodified
  • maintain a separate directory / repository holding job-specific configuration which import and extend the /pgrapher/ files.
  • mimic the organization patterns described above

Note, the reference configuration given here is subject to change without warning in the master branch. It will remain more stable within a release branch.

Checking configuration

While developing a configuration it is useful to periodically test that it is correct. There are several levels at which correctness can be checked.

Check syntax

In principle, every Jsonnet file should compile as a “main” file and testing this is easy. Simply run jsonnet specifying the top directory location for the wire-cell-cfg package. Eg:

$ jsonnet -J cfg cfg/pgrapher/uboone/test-nf.jsonnet > test-nf.json

If this spits out JSON then the Jsonnet is correctly formed. Some common mistakes are:

  • defining an attribute of an object as an exported function. In principle, function values are allowed as long as they are not retained in the configuration sequence. A simple fix that allows intermediate testing is to define the attribute with :: instead of the singular :.

Check content

There are many ways to check if the configuration is what you expect.

Read the JSON file

The JSON can get big but it’s where the truth is. Remember that units have been resolved so any quantities are expressed implicitly in the system of units.

Query the JSON file

Lots of tricks can be played with jq. For example, print out all configurations for a particular component type:

$ jq '.[] | select(.type | contains("Ductor"))' < ../foo.json
{
  "data": {
    "anode": "AnodePlane:uboone",
    "pirs": [
      "PlaneImpactResponse:PIRfield0plane0",
      "PlaneImpactResponse:PIRfield0plane1",
      "PlaneImpactResponse:PIRfield0plane2"
    ],
    "rng": "Random"
  },
  "name": "nominal",
  "type": "Ductor"
}

Find every object that is configured with a filename attribute set to some value:

$ jq '.[] | select(.data.filename == "ub-10-half.json.bz2")' < ../foo.json
{
  "data": {
    "filename": "ub-10-half.json.bz2"
  },
  "name": "field0",
  "type": "FieldResponse"
}

Rejigger the output to see what things have some value:

jq '.[] | select(.data.nticks==9600) | {type:.type}' < wcls-sim-nf-sp.json | grep type|sort |uniq
  "type": "Reframer"
  "type": "wclsFrameSaver"
jq '.[] | select(.data.nticks > 9600) | {type:.type,nticks:.data.nticks}' < wcls-sim-nf-sp.json | grep type|sort |uniq
  "type": "ColdElecResponse",
  "type": "PlaneImpactResponse",
  "type": "RCResponse",
jq '.[] | select(.data.nticks > 9600) | {type:.type,nticks:.data.nticks}' < wcls-sim-nf-sp.json | grep nticks|sort |uniq
  "nticks": 9782

Check graph

Just having correct syntax goes a long way to having correct configuration but of course it does not guarantee correct content and semantics.

Much of the configuration culminates in the Pgrapher component graph. The wire-cell-python package provides a utility to generate a visual representation of this graph which quickly allows problems to be identified. Currently, this command needs to operate on precompiled JSON which can be generated as described by the syntax checking above.

$ wirecell-pgraph dotify --jpath '.' test-nf.json test-nf.pdf

The use of --jpath '.'~ is to tell the command how to locate the ~edges attribute. By default the command assumes a full configuration sequence with the Pgrapher configuration object as the last element.

Check C++ defaults

The C++ components hard-code some default configuration. See this blog entry.

$ wire-cell -p WireCellApps -p WireCellGen -a ConfigDumper > foo.json
$ jq '.[]|select(.type|contains("Ductor"))' < ../foo.json
{
  "data": {
    "anode": "AnodePlane",
    "continuous": true,
    "drift_speed": 0.001,
    "first_frame_number": 0,
    "fluctuate": true,
    "nsigma": 3,
    "pirs": [],
    "readout_time": 5000000,
    "rng": "Random",
    "start_time": 0,
    "tick": 500
  },
  "name": "",
  "type": "Ductor"
}
{
  "data": {
    "anode": "AnodePlane",
    "chain": [],
    "continuous": false,
    "first_frame_number": 0,
    "readout_time": 5000000,
    "start_time": 0
  },
  "name": "",
  "type": "MultiDuctor"
}

Check usage

Finally, one must use the configuration and validate results. Usage of WCT is described in detail in the manual and news blog and elsewhere. The only thing to add here is that this file naming convention is followed for the main entry points:

wct-*.jsonnet
files intended for use in stand-alone wire-cell command line interface.
wcls-*.jsonnet
files intended for use in WC/LS art jobs. Reference FHiCL is provided in files of the same name but with .fcl extension.