snowball_py

by shibukawa

shibukawa / snowball_py

Snowball stemming library collection for Python

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Snowball stemming library collection for Python

This document pertains to the Python version of the stemmer library distribution, available for download from:

  • https://github.com/shibukawa/snowball/

This repository includes Python source code generator

  • https://github.com/shibukawa/snowball_python/

This repository includes generated Python source codes

Original program is maintained at following place:

  • http://snowball.tartarus.org/

Original Snowball product created by Dr Martin Porter and Richard Boulton (Java porting). Original Snowball and my products are released under BSD license.

How to use library

The

snowballstemmer
module has two functions.

The

snowballstemmer.algorithms
function returns a list of avilable algorithm name' string.

The

snowballstemmer.stemmer
function accepts algorithm name and returns
Stemmer
objects.

Stemmer
objects have
Stemmer.stemWord(word)
method and
Stemmer.stemWords(word[])
method.

.. code-block:: python

import snowballstemmer

stemmer = snowballstemmer.stemmer('english'); print(stemmer.stemWords("We are the world".split()));

Stemmer
objects have
Stemmer.maxCacheSize
property. They cache result within the value. Default is
10000
.

Accerarates Stemming

if PyStemmer is installed,

snowballstemmer.stemmer
returns
PyStemmer
\ 's
Stemmer
objects. This
Stemmer
object has same methods (
Stemmer.stemWord()
,
Stemmer.stemWords()
).

PyStemmer is a Snowball's

libstemmer_c
wrapper module and it returns 100% compatible result with snowballstemmer.

PyStemmer has faster speed because it uses C-lang module, and snowballstemmer has higher usability because it is pure Python module.

  • PyStemmer 
    _

Benchmark ~~~~~~~~~

Test Case: Snowball stemmer check data (16 algorithms, total 582560 words, cache hit 0%) Computer: MacBook Pro 3rd Gen Corei7 2.3GHz

  • Python 2.7 + snowballstemmer : 2m 30s
  • PyPy 1.9 + snowballstemmer : 45s
  • Python 2.7 + PyStemmer : 5s

This test case is much harder than usual usecases!

The TestApp example

The

testapp.py
example program allows you to run any of the stemmers on a sample vocabulary.

Usage::

testapp.py "sentences ... "

.. code-block:: bash

$ python testapp.py English "sentences... "

Thanks

  • Original Snowball authors
  • Emil Stenström

License

It is a BSD licensed library.


Copyright (c) 2013, Yoshiki Shibukawa

All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  • Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
  • Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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