DiaPipelineTask¶

class lsst.ap.association.DiaPipelineTask(initInputs=None, **kwargs)¶

Bases: PipelineTask

Task for loading, associating and storing Difference Image Analysis (DIA) Objects and Sources.

Attributes Summary

canMultiprocess

Methods Summary

`createNewDiaObjects`(unAssocDiaSources)	Loop through the set of DiaSources and create new DiaObjects for unassociated DiaSources.
`emptyMetadata`()	Empty (clear) the metadata for this Task and all sub-Tasks.
`getFullMetadata`()	Get metadata for all tasks.
`getFullName`()	Get the task name as a hierarchical name including parent task names.
`getName`()	Get the name of the task.
`getTaskDict`()	Get a dictionary of all tasks as a shallow copy.
`makeField`(doc)	Make a `lsst.pex.config.ConfigurableField` for this task.
`makeSubtask`(name, **keyArgs)	Create a subtask as a new instance as the `name` attribute of this task.
`purgeDiaObjects`(bbox, wcs, diaObjCat[, buffer])	Drop diaObjects that are outside the exposure bounding box.
`run`(diaSourceTable, solarSystemObjectTable, ...)	Process DiaSources and DiaObjects.
`runQuantum`(butlerQC, inputRefs, outputRefs)	Do butler IO and transform to provide in memory objects for tasks `run` method.
`testDataFrameIndex`(df)	Test the sorted DataFrame index for duplicates.
`timer`(name[, logLevel])	Context manager to log performance data for an arbitrary block of code.

Attributes Documentation

canMultiprocess: ClassVar[bool] = True¶

Methods Documentation

createNewDiaObjects(unAssocDiaSources)¶

Loop through the set of DiaSources and create new DiaObjects for unassociated DiaSources.

Parameters:

unAssocDiaSourcespandas.DataFrame: Set of DiaSources to create new DiaObjects from.

Returns:

resultslsst.pipe.base.Struct

Results struct containing:

diaSources : DiaSource catalog with updated DiaObject ids. (pandas.DataFrame)
newDiaObjects : Newly created DiaObjects from the unassociated DiaSources. (pandas.DataFrame)
nNewDiaObjects : Number of newly created diaObjects.(int)

emptyMetadata() → None¶: Empty (clear) the metadata for this Task and all sub-Tasks.

getFullMetadata() → TaskMetadata¶

Get metadata for all tasks.

Returns:

metadataTaskMetadata: The keys are the full task name. Values are metadata for the top-level task and all subtasks, sub-subtasks, etc.

Notes

The returned metadata includes timing information (if @timer.timeMethod is used) and any metadata set by the task. The name of each item consists of the full task name with . replaced by :, followed by . and the name of the item, e.g.:

topLevelTaskName:subtaskName:subsubtaskName.itemName

using : in the full task name disambiguates the rare situation that a task has a subtask and a metadata item with the same name.

getFullName() → str¶

Get the task name as a hierarchical name including parent task names.

Returns:

fullNamestr

The full name consists of the name of the parent task and each subtask separated by periods. For example:

The full name of top-level task “top” is simply “top”.
The full name of subtask “sub” of top-level task “top” is “top.sub”.
The full name of subtask “sub2” of subtask “sub” of top-level task “top” is “top.sub.sub2”.

getName() → str¶

Get the name of the task.

Returns:

taskNamestr: Name of the task.

See also

getFullName: Get the full name of the task.

getTaskDict() → dict[str, weakref.ReferenceType[lsst.pipe.base.task.Task]]¶

Get a dictionary of all tasks as a shallow copy.

Returns:

taskDictdict: Dictionary containing full task name: task object for the top-level task and all subtasks, sub-subtasks, etc.

classmethod makeField(doc: str) → ConfigurableField¶

Make a lsst.pex.config.ConfigurableField for this task.

Parameters:

docstr: Help text for the field.

Returns:

configurableFieldlsst.pex.config.ConfigurableField: A ConfigurableField for this task.

Examples

Provides a convenient way to specify this task is a subtask of another task.

Here is an example of use:

class OtherTaskConfig(lsst.pex.config.Config):
    aSubtask = ATaskClass.makeField("brief description of task")

makeSubtask(name: str, **keyArgs: Any) → None¶

Create a subtask as a new instance as the name attribute of this task.

Parameters:

namestr

Brief name of the subtask.

**keyArgs

Extra keyword arguments used to construct the task. The following arguments are automatically provided and cannot be overridden:

config.
parentTask.

Notes

The subtask must be defined by Task.config.name, an instance of ConfigurableField or RegistryField.

purgeDiaObjects(bbox, wcs, diaObjCat, buffer=0)¶

Drop diaObjects that are outside the exposure bounding box.

Parameters:

bboxlsst.geom.Box2I: Bounding box of the exposure.
wcslsst.afw.geom.SkyWcs: Coordinate system definition (wcs) for the exposure.
diaObjCatpandas.DataFrame: DiaObjects loaded from the Apdb.
bufferint, optional: Width, in pixels, to pad the exposure bounding box.

Returns:

diaObjCatpandas.DataFrame: DiaObjects loaded from the Apdb, restricted to the exposure bounding box.

run(diaSourceTable, solarSystemObjectTable, diffIm, exposure, template, band, idGenerator)¶

Process DiaSources and DiaObjects.

Load previous DiaObjects and their DiaSource history. Calibrate the values in the diaSourceCat. Associate new DiaSources with previous DiaObjects. Run forced photometry at the updated DiaObject locations. Store the results in the Alert Production Database (Apdb).

Parameters:

diaSourceTablepandas.DataFrame: Newly detected DiaSources.
diffImlsst.afw.image.ExposureF: Difference image exposure in which the sources in diaSourceCat were detected.
exposurelsst.afw.image.ExposureF: Calibrated exposure differenced with a template to create diffIm.
templatelsst.afw.image.ExposureF: Template exposure used to create diffIm.
bandstr: The band in which the new DiaSources were detected.
idGeneratorlsst.meas.base.IdGenerator: Object that generates source IDs and random number generator seeds.

Returns:

resultslsst.pipe.base.Struct

Results struct with components.

apdbMaker : Marker dataset to store in the Butler indicating that this ccdVisit has completed successfully. (lsst.dax.apdb.ApdbConfig)
associatedDiaSources : Catalog of newly associated DiaSources. (pandas.DataFrame)

runQuantum(butlerQC, inputRefs, outputRefs)¶

Do butler IO and transform to provide in memory objects for tasks run method.

Parameters:

butlerQCQuantumContext: A butler which is specialized to operate in the context of a lsst.daf.butler.Quantum.
inputRefsInputQuantizedConnection: Datastructure whose attribute names are the names that identify connections defined in corresponding PipelineTaskConnections class. The values of these attributes are the lsst.daf.butler.DatasetRef objects associated with the defined input/prerequisite connections.
outputRefsOutputQuantizedConnection: Datastructure whose attribute names are the names that identify connections defined in corresponding PipelineTaskConnections class. The values of these attributes are the lsst.daf.butler.DatasetRef objects associated with the defined output connections.

testDataFrameIndex(df)¶

Test the sorted DataFrame index for duplicates.

Wrapped as a separate function to allow for mocking of the this task in unittesting. Default of a mock return for this test is True.

Parameters:

dfpandas.DataFrame: DataFrame to text.

Returns:

bool: True if DataFrame contains duplicate rows.

timer(name: str, logLevel: int = 10) → Iterator[None]¶

Context manager to log performance data for an arbitrary block of code.

Parameters:

namestr: Name of code being timed; data will be logged using item name: Start and End.
logLevelint: A logging level constant.

Navigation

DiaPipelineTask¶