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features-0.5.9
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Feature set algebra for linguistics
| ویژگی | مقدار |
|---|---|
| سیستم عامل | - |
| نام فایل | features-0.5.9 |
| نام | features |
| نسخه کتابخانه | 0.5.9 |
| نگهدارنده | [] |
| ایمیل نگهدارنده | [] |
| نویسنده | Sebastian Bank |
| ایمیل نویسنده | sebastian.bank@uni-leipzig.de |
| آدرس صفحه اصلی | https://github.com/xflr6/features |
| آدرس اینترنتی | https://pypi.org/project/features/ |
| مجوز | MIT |
Features
========
|PyPI version| |License| |Supported Python| |Format| |Docs|
|Travis| |Codecov|
Features is a simple implementation of **feature set algebra** in Python.
Linguistic analyses commonly use sets of **binary or privative features** to
refer to different groups of linguistic objects: for example a group of
*phonemes* that share some phonological features like ``[-consonantal, +high]``
or a set of *morphemes* that occur in context of a specific person/number
combination like ``[-participant, GROUP]``. Usually, the features are applied in
a way such that only **some of their combinations are valid**, while others are
impossible (i.e. refer to no object) |--| for example ``[+high, +low]``, or
``[-participant, +speaker]``.
With this package, such feature systems can be defined with a simple contingency
**table definition** (feature matrix) and stored under a section name in a
simple clear-text **configuration file**. Each feature system can then be
**loaded** by its name and provides its own ``FeatureSet`` subclass that
implements all **comparisons and operations** between its feature sets according
to the given definition (compatibility, entailment, intersection, unification,
etc.).
Features creates the **complete lattice** structure between the possible feature
sets of each feature system and lets you navigate and **visualize their
relations** using the `Graphviz graph layout software`_.
Links
-----
- GitHub: https://github.com/xflr6/features
- PyPI: https://pypi.org/project/features/
- Documentation: https://features.readthedocs.io
- Changelog: https://features.readthedocs.io/en/latest/changelog.html
- Issue Tracker: https://github.com/xflr6/features/issues
- Download: https://pypi.org/project/features/#files
Installation
------------
This package runs under Python 2.7 and 3.5+, use pip_ to install:
.. code:: bash
$ pip install features
This will also install the concepts_ package from PyPI providing the `Formal
Concept Analysis`_ (FCA) algorithms on which this package is based.
Quickstart
----------
Load a **predefined feature system** by name (in this case features for a
six-way person/number distinction, cf. the definitions in the bundled
``config.ini`` in the `source repository`_).
.. code:: python
>>> import features
>>> fs = features.FeatureSystem('plural')
>>> print(fs.context) # doctest: +ELLIPSIS
<Context object mapping 6 objects to 10 properties [3011c283] at 0x...>
|+1|-1|+2|-2|+3|-3|+sg|+pl|-sg|-pl|
1s|X | | |X | |X |X | | |X |
1p|X | | |X | |X | |X |X | |
2s| |X |X | | |X |X | | |X |
2p| |X |X | | |X | |X |X | |
3s| |X | |X |X | |X | | |X |
3p| |X | |X |X | | |X |X | |
Create **feature sets** from strings or string sequences. Use **feature string
parsing**, get back string sequences and feature or extent strings in
their canonical order (definition order):
.. code:: python
>>> fs('+1 +sg'), fs(['+2', '+2', '+sg']), fs(['+sg', '+3'])
(FeatureSet('+1 +sg'), FeatureSet('+2 +sg'), FeatureSet('+3 +sg'))
>>> fs('SG1').concept.intent
('+1', '-2', '-3', '+sg', '-pl')
>>> fs('1').string, fs('1').string_maximal, fs('1').string_extent
('+1', '+1 -2 -3', '1s 1p')
Use **feature algebra**: intersection (`join`) , union/unification (`meet`),
set inclusion (`extension/subsumption`). Do feature set comparisons
(`logical connectives`_).
.. code:: python
>>> fs('+1 +sg') % fs('+2 +sg')
FeatureSet('-3 +sg')
>>> fs('-3') ^ fs('+1') ^ fs('-pl')
FeatureSet('+1 +sg')
>>> fs('+3') > fs('-1') and fs('+pl') < fs('+2 -sg')
True
>>> fs('+1').incompatible_with(fs('+3')) and fs('+sg').complement_of(fs('+pl'))
True
Navigate the created subsumption lattice_ (`Hasse graph`_) of **all valid
feature sets**:
.. code:: python
>>> fs('+1').upper_neighbors, fs('+1').lower_neighbors
([FeatureSet('-3'), FeatureSet('-2')], [FeatureSet('+1 +sg'), FeatureSet('+1 +pl')])
>>> fs('+1').upset()
[FeatureSet('+1'), FeatureSet('-3'), FeatureSet('-2'), FeatureSet('')]
>>> for f in fs: # doctest: +ELLIPSIS
... print('[%s] <-> {%s}' % (f.string_maximal, f.string_extent))
[+1 -1 +2 -2 +3 -3 +sg +pl -sg -pl] <-> {}
[+1 -2 -3 +sg -pl] <-> {1s}
...
[-1] <-> {2s 2p 3s 3p}
[] <-> {1s 1p 2s 2p 3s 3p}
See `the docs`_ on how to define, load, and use **your own feature systems**.
Further reading
---------------
- https://en.wikipedia.org/wiki/Join_and_meet
- https://en.wikipedia.org/wiki/Formal_concept_analysis
- http://www.upriss.org.uk/fca/
See also
--------
- concepts_ |--| Formal Concept Analysis with Python
- fileconfig_ |--| Config file sections as objects
- graphviz_ |--| Simple Python interface for Graphviz
License
-------
Features is distributed under the `MIT license`_.
.. _pip: https://pip.readthedocs.io
.. _Graphviz graph layout software: http://www.graphviz.org
.. _Formal Concept Analysis: https://en.wikipedia.org/wiki/Formal_concept_analysis
.. _source repository: https://github.com/xflr6/features/blob/master/features/config.ini
.. _logical connectives: https://en.wikipedia.org/wiki/Template:Logical_connectives_table_and_Hasse_diagram
.. _lattice: https://en.wikipedia.org/wiki/Lattice_(order)
.. _Hasse graph: https://en.wikipedia.org/wiki/Hasse_diagram
.. _the docs: https://features.readthedocs.io/en/stable/manual.html
.. _concepts: https://pypi.org/project/concepts/
.. _fileconfig: https://pypi.org/project/fileconfig/
.. _graphviz: https://pypi.org/project/graphviz/
.. _MIT license: https://opensource.org/licenses/MIT
.. |--| unicode:: U+2013
.. |PyPI version| image:: https://img.shields.io/pypi/v/features.svg
:target: https://pypi.org/project/features/
:alt: Latest PyPI Version
.. |License| image:: https://img.shields.io/pypi/l/features.svg
:target: https://pypi.org/project/features/
:alt: License
.. |Supported Python| image:: https://img.shields.io/pypi/pyversions/features.svg
:target: https://pypi.org/project/features/
:alt: Supported Python Versions
.. |Format| image:: https://img.shields.io/pypi/format/features.svg
:target: https://pypi.org/project/features/
:alt: Format
.. |Docs| image:: https://readthedocs.org/projects/features/badge/?version=stable
:target: https://features.readthedocs.io/en/stable/
:alt: Readthedocs
.. |Travis| image:: https://img.shields.io/travis/xflr6/features.svg
:target: https://travis-ci.org/xflr6/features
:alt: Travis
.. |Codecov| image:: https://codecov.io/gh/xflr6/features/branch/master/graph/badge.svg
:target: https://codecov.io/gh/xflr6/features
:alt: Codecov
نیازمندی
| مقدار | نام |
|---|---|
| ~=0.7 | concepts |
| ~=0.5 | fileconfig |
| ~=0.7 | graphviz |
| - | flake8 |
| - | pep8-naming |
| - | wheel |
| - | twine |
| >=1.7 | sphinx |
| - | sphinx-rtd-theme |
| !=3.10.0,>=3.4 | pytest |
| - | pytest-cov |
زبان مورد نیاز
| مقدار | نام |
|---|---|
| >=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.* | Python |
نحوه نصب
نصب پکیج whl features-0.5.9:
pip install features-0.5.9.whl
نصب پکیج tar.gz features-0.5.9:
pip install features-0.5.9.tar.gz