MatchProbabilisticTask

class lsst.meas.astrom.MatchProbabilisticTask(**kwargs)

Bases: lsst.pipe.base.Task

Run MatchProbabilistic on a reference and target catalog covering the same tract.

Attributes Summary

columns_in_ref
columns_in_target

Methods Summary

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.
match(catalog_ref, catalog_target, …) Match sources in a reference tract catalog with a target catalog.
run(catalog_ref, catalog_target, wcs, **kwargs) Match sources in a reference tract catalog with a target catalog.
timer(name, logLevel) Context manager to log performance data for an arbitrary block of code.

Attributes Documentation

columns_in_ref
columns_in_target

Methods Documentation

emptyMetadata() → None

Empty (clear) the metadata for this Task and all sub-Tasks.

getFullMetadata() → lsst.pipe.base._task_metadata.TaskMetadata

Get metadata for all tasks.

Returns:
metadata : TaskMetadata

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:
fullName : str

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:
taskName : str

Name of the task.

See also

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

Get a dictionary of all tasks as a shallow copy.

Returns:
taskDict : dict

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

classmethod makeField(doc: str) → lsst.pex.config.configurableField.ConfigurableField

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

Parameters:
doc : str

Help text for the field.

Returns:
configurableField : lsst.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) → None

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

Parameters:
name : str

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.

match(catalog_ref: pandas.core.frame.DataFrame, catalog_target: pandas.core.frame.DataFrame, select_ref: numpy.array = None, select_target: numpy.array = None, wcs: lsst.afw.geom.SkyWcs = None, logger: logging.Logger = None, logging_n_rows: int = None) → Tuple[pandas.core.frame.DataFrame, pandas.core.frame.DataFrame, Dict[int, str]]

Match sources in a reference tract catalog with a target catalog.

Parameters:
catalog_ref : pandas.DataFrame

A reference catalog to match objects/sources from.

catalog_target : pandas.DataFrame

A target catalog to match reference objects/sources to.

select_ref : numpy.array

A boolean array of the same length as catalog_ref selecting the sources that can be matched.

select_target : numpy.array

A boolean array of the same length as catalog_target selecting the sources that can be matched.

wcs : lsst.afw.image.SkyWcs

A coordinate system to convert catalog positions to sky coordinates. Only used if self.config.coords_ref_to_convert is set.

logger : logging.Logger

A Logger for logging.

logging_n_rows : int

Number of matches to make before outputting incremental log message.

Returns:
catalog_out_ref : pandas.DataFrame

Reference matched catalog with indices of target matches.

catalog_out_target : pandas.DataFrame

Reference matched catalog with indices of target matches.

run(catalog_ref: pandas.core.frame.DataFrame, catalog_target: pandas.core.frame.DataFrame, wcs: lsst.afw.geom.SkyWcs = None, **kwargs) → lsst.pipe.base.struct.Struct

Match sources in a reference tract catalog with a target catalog.

Parameters:
catalog_ref : pandas.DataFrame

A reference catalog to match objects/sources from.

catalog_target : pandas.DataFrame

A target catalog to match reference objects/sources to.

wcs : lsst.afw.image.SkyWcs

A coordinate system to convert catalog positions to sky coordinates. Only needed if config.coords_ref_to_convert is used to convert reference catalog sky coordinates to pixel positions.

kwargs : Additional keyword arguments to pass to match.
Returns:
retStruct : lsst.pipe.base.Struct

A struct with output_ref and output_target attribute containing the output matched catalogs, as well as a dict

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

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

Parameters:
name : str

Name of code being timed; data will be logged using item name: Start and End.

logLevel

A logging level constant.

See also

timer.logInfo

Examples

Creating a timer context:

with self.timer("someCodeToTime"):
    pass  # code to time