API Reference¶
add_config |
Add feature system definition file on top of the stack of config files. |
make_features |
Return a new feature system from context string in the given format. |
FeatureSystem |
Feature set lattice defined by config instance. |
features.bases.FeatureSet |
Formal concept intent as ordered set of features. |
features.Config |
Define possible feature combinations and their minimal specification. |
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features.
add_config
(filename)¶ Add feature system definition file on top of the stack of config files.
Parameters: filename – Path to the INI-file with feature system definitions. Note
If
filename
is a relative path, it is resolved relative to the directory of the caller (which may be different from the current working dicrectry).
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features.
make_features
(context, frmat='table', str_maximal=False)¶ Return a new feature system from context string in the given format.
Parameters: Example
>>> make_features(''' ... |+male|-male|+adult|-adult| ... man | X | | X | | ... woman| | X | X | | ... boy | X | | | X | ... girl | | X | | X | ... ''') # doctest: +ELLIPSIS <FeatureSystem object of 4 atoms 10 featuresets at 0x...>
FeatureSystem¶
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class
features.
FeatureSystem
(config)¶ Feature set lattice defined by config instance.
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__call__
(string='', allow_invalid=False)¶ Idempotently return featureset from parsed feature
string
.
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__contains__
(other)¶ Test for feature set membership.
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__getitem__
(index)¶ Return the feature set with the given
index
.
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__iter__
()¶ Yield all feature sets.
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__len__
()¶ Return the number of feature sets.
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atoms
¶ The systems Minimal non-infimum feature sets.
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context
¶ The FCA context defining the feature system.
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description
¶ A description of the feature system.
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downset_union
(featuresets)¶ Yield all featuresets that imply any of the given ones.
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graphviz
(highlight=None, maximal_label=None, topdown=None, filename=None, directory=None, render=False, view=False, **kwargs)¶ Return the system lattice visualization as graphviz source.
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infimum
¶ The systems most specific feature set.
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join
(featuresets)¶ Return the nearest featureset that subsumes all given ones.
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key
¶ The unique name of the feature system.
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lattice
¶ The corresponding FCA lattice of the feature system.
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meet
(featuresets)¶ Return the nearest featureset that implies all given ones.
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supremum
¶ The systems most general feature set.
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upset_union
(featuresets)¶ Yield all featuresets that subsume any of the given ones.
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FeatureSet¶
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class
features.bases.
FeatureSet
(concept)¶ Formal concept intent as ordered set of features.
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atoms
¶ The subsumed atoms.
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complement_of
(other)¶ Empty common extent and universal extent union comparison.
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concept
¶ The corresponding FCA concept.
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downset
()¶ Return the list of subsumed neighbors (including self).
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implies
(other)¶ Implication comparison.
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incompatible_with
(other)¶ Empty common extent comparison.
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index
¶ The position of the feature set with its system.
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intersection
(other)¶ Return the closest implied neighbor (generalization, join).
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lower_neighbors
¶ The directly subsumed neighbors.
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orthogonal_to
(other)¶ Nonempty common extent, incomparable, nonempty extent union comparison.
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properly_implies
(other)¶ Proper implication comparison.
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properly_subsumes
(other)¶ Proper subsumption comparison.
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string
¶ Space-concatenated minimal features.
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string_extent
¶ Space-concatenated extent labels.
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string_maximal
¶ All features space-concatenated.
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subcontrary_with
(other)¶ Nonempty common extent and universal extent union comparison.
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subsumes
(other)¶ Submsumption comparison.
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union
(other)¶ Return the closest subsumed neighbor (unification, meet).
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upper_neighbors
¶ The directly implied neighbors.
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upset
()¶ Return the list of implied neighbors (including self).
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