DiaObjectCalculationTask¶

class lsst.meas.base.DiaObjectCalculationTask(plugMetadata=None, **kwargs)¶

Bases: lsst.meas.base.CatalogCalculationTask

Run plugins which operate on a catalog of DIA sources.

This task facilitates running plugins which will operate on a source catalog. These plugins may do things such as classifying an object based on source record entries inserted during a measurement task.

This task differs from CatalogCaculationTask in the following ways:

-No multi mode is available for plugins. All plugins are assumed to run: in single mode.
-Input and output catalog types are assumed to be pandas.DataFrames with: columns following those used in the Apdb.
-No schema argument is passed to the plugins. Each plugin specifies: output columns and required inputs.

Parameters:	plugMetaData : `lsst.daf.base.PropertyList` or `None` Will be modified in-place to contain metadata about the plugins being run. If `None`, an empty `PropertyList` will be created. **kwargs Additional arguments passed to the superclass constructor.

Notes

Plugins may either take an entire catalog to work on at a time, or work on individual records.

Methods Summary

`callCompute`(diaObjectCat, diaSourceCat, …)	Run each of the plugins on the catalog.
`emptyMetadata`()	Empty (clear) the metadata for this Task and all sub-Tasks.
`getAllSchemaCatalogs`()	Get schema catalogs for all tasks in the hierarchy, combining the results into a single dict.
`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.
`getSchemaCatalogs`()	Get the schemas generated by this task.
`getTaskDict`()	Get a dictionary of all tasks as a shallow copy.
`initializePlugins`()	Initialize the plugins according to the configuration.
`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.
`run`(diaObjectCat, diaSourceCat, …)	The entry point for the DIA catalog calculation task.
`timer`(name[, logLevel])	Context manager to log performance data for an arbitrary block of code.

Methods Documentation

callCompute(diaObjectCat, diaSourceCat, updatedDiaObjectIds, filterNames)¶

Run each of the plugins on the catalog.

For catalog column names see the lsst.cat schema definitions for the DiaObject and DiaSource tables (http://github.com/lsst/cat).

Parameters:	diaObjectCat : `pandas.DataFrame` DiaObjects to update values of and append new objects to. DataFrame should be indexed on “diaObjectId” diaSourceCat : `pandas.DataFrame` DiaSources associated with the DiaObjects in diaObjectCat. DataFrame must be indexed on [“diaObjectId”, “filterName”, “diaSourceId”]` updatedDiaObjectIds : `numpy.ndarray` Integer ids of the DiaObjects to update and create. filterNames : `list` of `str` List of string names of filters to be being processed.
Returns:	returnStruct : `lsst.pipe.base.Struct` Struct containing: `diaObjectCat` Full set of DiaObjects including both un-updated and updated/new DiaObjects (`pandas.DataFrame`). `updatedDiaObjects` Catalog of DiaObjects that were updated or created by this task (`pandas.DataFrame`).
Raises:	KeyError Raises if `pandas.DataFrame` indexing is not properly set.

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

getAllSchemaCatalogs()¶

Get schema catalogs for all tasks in the hierarchy, combining the results into a single dict.

Returns:	schemacatalogs : `dict` Keys are butler dataset type, values are a empty catalog (an instance of the appropriate `lsst.afw.table` Catalog type) for all tasks in the hierarchy, from the top-level task down through all subtasks.

Notes

This method may be called on any task in the hierarchy; it will return the same answer, regardless.

The default implementation should always suffice. If your subtask uses schemas the override Task.getSchemaCatalogs, not this method.

getFullMetadata()¶

Get metadata for all tasks.

Returns:	metadata : `lsst.daf.base.PropertySet` The `PropertySet` 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()¶

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()¶

Get the name of the task.

Returns:	taskName : `str` Name of the task.

See also

Task.getAllSchemaCatalogs

Notes

Warning

Subclasses that use schemas must override this method. The default implementation returns an empty dict.

This method may be called at any time after the Task is constructed, which means that all task schemas should be computed at construction time, not when data is actually processed. This reflects the philosophy that the schema should not depend on the data.

Returning catalogs rather than just schemas allows us to save e.g. slots for SourceCatalog as well.

getTaskDict()¶

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.

initializePlugins()¶: Initialize the plugins according to the configuration.

classmethod makeField(doc)¶

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, **keyArgs)¶

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.

run(diaObjectCat, diaSourceCat, updatedDiaObjectIds, filterNames)¶

The entry point for the DIA catalog calculation task.

Run method both updates the values in the diaObjectCat and appends newly created DiaObjects to the catalog. For catalog column names see the lsst.cat schema definitions for the DiaObject and DiaSource tables (http://github.com/lsst/cat).

Parameters:

diaObjectCat : pandas.DataFrame: DiaObjects to update values of and append new objects to. DataFrame should be indexed on “diaObjectId”
diaSourceCat : pandas.DataFrame: DiaSources associated with the DiaObjects in diaObjectCat. DataFrame should be indexed on ["diaObjectId", "filterName", "diaSourceId"]
updatedDiaObjectIds : numpy.ndarray: Integer ids of the DiaObjects to update and create.
filterNames : list of str: List of string names of filters to be being processed.

Returns:

returnStruct : lsst.pipe.base.Struct

Struct containing:

diaObjectCat: Full set of DiaObjects including both un-updated and updated/new DiaObjects (pandas.DataFrame).
updatedDiaObjects: Catalog of DiaObjects that were updated or created by this task (pandas.DataFrame).

timer(name, logLevel=10)¶

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.

Navigation

DiaObjectCalculationTask¶