MatchProbabilisticConfig¶

class lsst.meas.astrom.MatchProbabilisticConfig¶

Bases: lsst.pex.config.Config

Configuration for the MatchProbabilistic matcher.

Attributes Summary

`column_order`	Column to sort fit by.
`column_ref_coord1`	The reference table column for the first spatial coordinate (usually x or ra).
`column_ref_coord2`	The reference table column for the second spatial coordinate (usually y or dec).Units must match column_ref_coord1.
`column_target_coord1`	The target table column for the first spatial coordinate (usually x or ra).Units must match column_ref_coord1.
`column_target_coord2`	The target table column for the second spatial coordinate (usually y or dec).Units must match column_ref_coord2.
`columns_in_ref`
`columns_in_target`
`columns_ref_flux`	List of reference flux columns to nansum total magnitudes from if column_order is None (`List`, default `[]`)
`columns_ref_meas`	The reference table columns to compute match likelihoods from (usually centroids and fluxes/magnitudes) (`List`)
`columns_target_err`	Target table columns with standard errors (sigma) corresponding to columns_ref_meas (`List`)
`columns_target_meas`	Target table columns with measurements corresponding to columns_ref_meas (`List`)
`columns_target_select_false`	Target table columns to require to be False for selecting match candidates (`List`, default `('merge_peak_sky',)`)
`columns_target_select_true`	Target table columns to require to be True for selecting match candidates (`List`, default `('detect_isPrimary',)`)
`coords_ref_factor`	Multiplicative factor for reference catalog coordinates.If coords_spherical is true, this must be the number of degrees per unit increment of column_ref_coord[12].
`coords_ref_to_convert`	Dict mapping sky coordinate columns to be converted to tract pixel columns (`Dict`)
`coords_spherical`	Whether column_*_coord[12] are spherical coordinates (ra/dec) or not (pixel x/y) (`bool`, default `True`)
`coords_target_factor`	Multiplicative factor for target catalog coordinates.If coords_spherical is true, this must be the number of degrees per unit increment of column_target_coord[12].
`history`
`mag_brightest_ref`	Bright magnitude cutoff for selecting reference sources to match.
`mag_faintest_ref`	Faint magnitude cutoff for selecting reference sources to match.
`mag_zeropoint_ref`	Magnitude zeropoint for computing reference source magnitudes for selection.
`match_dist_max`	Maximum match distance.
`match_n_finite_min`	Minimum number of columns with a finite value to measure match likelihood (`int`, default `3`)
`match_n_max`	Maximum number of spatial matches to consider (in ascending distance order).
`order_ascending`	Whether to order reference match candidates in ascending order of column_order (should be False if the column is a flux and True if it is a magnitude.

Methods Summary

`compare`(other[, shortcut, rtol, atol, output])	Compare this configuration to another `Config` for equality.
`formatHistory`(name, **kwargs)	Format a configuration field’s history to a human-readable format.
`freeze`()	Make this config, and all subconfigs, read-only.
`items`()	Get configurations as `(field name, field value)` pairs.
`iteritems`()	Iterate over (field name, field value) pairs.
`iterkeys`()	Iterate over field names
`itervalues`()	Iterate over field values.
`keys`()	Get field names.
`load`(filename[, root])	Modify this config in place by executing the Python code in a configuration file.
`loadFromStream`(stream[, root, filename])	Modify this Config in place by executing the Python code in the provided stream.
`loadFromString`(code[, root, filename])	Modify this Config in place by executing the Python code in the provided string.
`names`()	Get all the field names in the config, recursively.
`save`(filename[, root])	Save a Python script to the named file, which, when loaded, reproduces this config.
`saveToStream`(outfile[, root, skipImports])	Save a configuration file to a stream, which, when loaded, reproduces this config.
`saveToString`([skipImports])	Return the Python script form of this configuration as an executable string.
`setDefaults`()	Subclass hook for computing defaults.
`toDict`()	Make a dictionary of field names and their values.
`update`(**kw)	Update values of fields specified by the keyword arguments.
`validate`()	Validate the Config, raising an exception if invalid.
`values`()	Get field values.

Attributes Documentation

column_order¶: Column to sort fit by. Derived from columns_flux if not set. (str, default None)

column_ref_coord1¶: The reference table column for the first spatial coordinate (usually x or ra). (str, default 'ra')

column_ref_coord2¶: The reference table column for the second spatial coordinate (usually y or dec).Units must match column_ref_coord1. (str, default 'dec')

column_target_coord1¶: The target table column for the first spatial coordinate (usually x or ra).Units must match column_ref_coord1. (str, default 'coord_ra')

column_target_coord2¶: The target table column for the second spatial coordinate (usually y or dec).Units must match column_ref_coord2. (str, default 'coord_dec')

columns_in_ref¶

columns_in_target¶

columns_ref_flux¶: List of reference flux columns to nansum total magnitudes from if column_order is None (List, default [])

columns_ref_meas¶: The reference table columns to compute match likelihoods from (usually centroids and fluxes/magnitudes) (List)

columns_target_err¶: Target table columns with standard errors (sigma) corresponding to columns_ref_meas (List)

columns_target_meas¶: Target table columns with measurements corresponding to columns_ref_meas (List)

columns_target_select_false¶: Target table columns to require to be False for selecting match candidates (List, default ('merge_peak_sky',))

columns_target_select_true¶: Target table columns to require to be True for selecting match candidates (List, default ('detect_isPrimary',))

coords_ref_factor¶: Multiplicative factor for reference catalog coordinates.If coords_spherical is true, this must be the number of degrees per unit increment of column_ref_coord[12]. Otherwise, it must convert the coordinate to the same units as the target coordinates. (float, default 1.0)

coords_ref_to_convert¶: Dict mapping sky coordinate columns to be converted to tract pixel columns (Dict)

coords_spherical¶: Whether column_*_coord[12] are spherical coordinates (ra/dec) or not (pixel x/y) (bool, default True)

coords_target_factor¶: Multiplicative factor for target catalog coordinates.If coords_spherical is true, this must be the number of degrees per unit increment of column_target_coord[12]. Otherwise, it must convert the coordinate to the same units as the reference coordinates. (float, default 1.0)

history¶

mag_brightest_ref¶: Bright magnitude cutoff for selecting reference sources to match. Ignored if column_order is None. (float, default -inf)

mag_faintest_ref¶: Faint magnitude cutoff for selecting reference sources to match. Ignored if column_order is None. (float, default inf)

mag_zeropoint_ref¶: Magnitude zeropoint for computing reference source magnitudes for selection. Ignored if column_order is None. (float, default 31.4)

match_dist_max¶: Maximum match distance. Units must be arcseconds if coords_spherical, or else match those of column_*_coord[12] multiplied by coords_*_factor. (float, default 0.5)

match_n_finite_min¶: Minimum number of columns with a finite value to measure match likelihood (int, default 3)

match_n_max¶: Maximum number of spatial matches to consider (in ascending distance order). (int, default 10)

order_ascending¶: Whether to order reference match candidates in ascending order of column_order (should be False if the column is a flux and True if it is a magnitude. (bool, default False)

Methods Documentation

compare(other, shortcut=True, rtol=1e-08, atol=1e-08, output=None)¶

Compare this configuration to another Config for equality.

Parameters:

other : lsst.pex.config.Config: Other Config object to compare against this config.
shortcut : bool, optional: If True, return as soon as an inequality is found. Default is True.
rtol : float, optional: Relative tolerance for floating point comparisons.
atol : float, optional: Absolute tolerance for floating point comparisons.
output : callable, optional: A callable that takes a string, used (possibly repeatedly) to report inequalities.

Returns:

isEqual : bool: True when the two lsst.pex.config.Config instances are equal. False if there is an inequality.

See also

lsst.pex.config.compareConfigs

Notes

Unselected targets of RegistryField fields and unselected choices of ConfigChoiceField fields are not considered by this method.

Floating point comparisons are performed by numpy.allclose.

formatHistory(name, **kwargs)¶

Format a configuration field’s history to a human-readable format.

Parameters:	name : `str` Name of a `Field` in this config. kwargs Keyword arguments passed to `lsst.pex.config.history.format`.
Returns:	history : `str` A string containing the formatted history.

See also

lsst.pex.config.history.format

freeze()¶: Make this config, and all subconfigs, read-only.

items()¶

Get configurations as (field name, field value) pairs.

Returns:	items : `list` List of tuples for each configuration. Tuple items are: Field name. Field value.

See also

lsst.pex.config.Config.iteritems

iteritems()¶

Iterate over (field name, field value) pairs.

Yields:	item : `tuple` Tuple items are: Field name. Field value.

See also

lsst.pex.config.Config.items

iterkeys()¶

Iterate over field names

Yields:	key : `str` A field’s key (attribute name).

See also

lsst.pex.config.Config.values

itervalues()¶

Iterate over field values.

Yields:	value : obj A field value.

See also

lsst.pex.config.Config.values

keys()¶

Get field names.

Returns:	names : `list` List of `lsst.pex.config.Field` names.

See also

lsst.pex.config.Config.iterkeys

load(filename, root='config')¶

Modify this config in place by executing the Python code in a configuration file.

Parameters:

filename : str

Name of the configuration file. A configuration file is Python module.

root : str, optional

Name of the variable in file that refers to the config being overridden.

For example, the value of root is "config" and the file contains:

config.myField = 5

Then this config’s field myField is set to 5.

Deprecated: For backwards compatibility, older config files that use root="root" instead of root="config" will be loaded with a warning printed to sys.stderr. This feature will be removed at some point.

loadFromStream(stream, root='config', filename=None)¶

Modify this Config in place by executing the Python code in the provided stream.

Parameters:

stream : file-like object, str, bytes, or compiled string

Stream containing configuration override code. If this is a code object, it should be compiled with mode="exec".

root : str, optional

Name of the variable in file that refers to the config being overridden.

For example, the value of root is "config" and the file contains:

config.myField = 5

Then this config’s field myField is set to 5.

Deprecated: For backwards compatibility, older config files that use root="root" instead of root="config" will be loaded with a warning printed to sys.stderr. This feature will be removed at some point.

filename : str, optional

Name of the configuration file, or None if unknown or contained in the stream. Used for error reporting.

Notes

For backwards compatibility reasons, this method accepts strings, bytes and code objects as well as file-like objects. New code should use loadFromString instead for most of these types.

loadFromString(code, root='config', filename=None)¶

Modify this Config in place by executing the Python code in the provided string.

Parameters:

code : str, bytes, or compiled string

Stream containing configuration override code.

root : str, optional

Name of the variable in file that refers to the config being overridden.

For example, the value of root is "config" and the file contains:

config.myField = 5

Then this config’s field myField is set to 5.

Deprecated: For backwards compatibility, older config files that use root="root" instead of root="config" will be loaded with a warning printed to sys.stderr. This feature will be removed at some point.

filename : str, optional

Name of the configuration file, or None if unknown or contained in the stream. Used for error reporting.

names()¶

Get all the field names in the config, recursively.

Returns:	names : `list` of `str` Field names.

save(filename, root='config')¶

Save a Python script to the named file, which, when loaded, reproduces this config.

Parameters:	filename : `str` Desination filename of this configuration. root : `str`, optional Name to use for the root config variable. The same value must be used when loading (see `lsst.pex.config.Config.load`).

saveToStream(outfile, root='config', skipImports=False)¶

Save a configuration file to a stream, which, when loaded, reproduces this config.

Parameters:

outfile : file-like object: Destination file object write the config into. Accepts strings not bytes.
root: Name to use for the root config variable. The same value must be used when loading (see lsst.pex.config.Config.load).
skipImports : bool, optional: If True then do not include import statements in output, this is to support human-oriented output from pipetask where additional clutter is not useful.

saveToString(skipImports=False)¶

Return the Python script form of this configuration as an executable string.

Parameters:	skipImports : `bool`, optional If `True` then do not include `import` statements in output, this is to support human-oriented output from `pipetask` where additional clutter is not useful.
Returns:	code : `str` A code string readable by `loadFromString`.

setDefaults()¶

Subclass hook for computing defaults.

Notes

Derived Config classes that must compute defaults rather than using the Field instances’s defaults should do so here. To correctly use inherited defaults, implementations of setDefaults must call their base class’s setDefaults.

toDict()¶

Make a dictionary of field names and their values.

Returns:	dict_ : `dict` Dictionary with keys that are `Field` names. Values are `Field` values.

See also

lsst.pex.config.Field.toDict

Notes

This method uses the toDict method of individual fields. Subclasses of Field may need to implement a toDict method for this method to work.

update(**kw)¶

Update values of fields specified by the keyword arguments.

Parameters:	kw Keywords are configuration field names. Values are configuration field values.

Notes

The __at and __label keyword arguments are special internal keywords. They are used to strip out any internal steps from the history tracebacks of the config. Do not modify these keywords to subvert a Config instance’s history.

Examples

This is a config with three fields:

>>> from lsst.pex.config import Config, Field
>>> class DemoConfig(Config):
...     fieldA = Field(doc='Field A', dtype=int, default=42)
...     fieldB = Field(doc='Field B', dtype=bool, default=True)
...     fieldC = Field(doc='Field C', dtype=str, default='Hello world')
...
>>> config = DemoConfig()

These are the default values of each field:

>>> for name, value in config.iteritems():
...     print(f"{name}: {value}")
...
fieldA: 42
fieldB: True
fieldC: 'Hello world'

Using this method to update fieldA and fieldC:

>>> config.update(fieldA=13, fieldC='Updated!')

Now the values of each field are:

>>> for name, value in config.iteritems():
...     print(f"{name}: {value}")
...
fieldA: 13
fieldB: True
fieldC: 'Updated!'

validate()¶

Validate the Config, raising an exception if invalid.

Raises:	lsst.pex.config.FieldValidationError Raised if verification fails.

Notes

The base class implementation performs type checks on all fields by calling their validate methods.

Complex single-field validation can be defined by deriving new Field types. For convenience, some derived lsst.pex.config.Field-types (ConfigField and ConfigChoiceField) are defined in lsst.pex.config that handle recursing into subconfigs.

Inter-field relationships should only be checked in derived Config classes after calling this method, and base validation is complete.

values()¶

Get field values.

Returns:	values : `list` List of field values.

See also

lsst.pex.config.Config.itervalues

Navigation

MatchProbabilisticConfig¶