English word segmentation.
Project description
WordSegment is an Apache2 licensed module for English word segmentation, written in pure-Python, and based on a trillion-word corpus.
Based on code from the chapter “Natural Language Corpus Data” by Peter Norvig from the book “Beautiful Data” (Segaran and Hammerbacher, 2009).
Data files are derived from the Google Web Trillion Word Corpus, as described by Thorsten Brants and Alex Franz, and distributed by the Linguistic Data Consortium. This module contains only a subset of that data. The unigram data includes only the most common 333,000 words. Similarly, bigram data includes only the most common 250,000 phrases. Every word and phrase is lowercased with punctuation removed.
Features
Pure-Python
Fully documented
100% test coverage
Includes unigram and bigram data
Command line interface for batch processing
Easy to hack (e.g. different scoring, new data, different language)
Developed on Python 2.7
Tested on CPython 2.6, 2.7, 3.2, 3.3, 3.4 and PyPy 2.2
User Guide
Installing WordSegment is simple with pip:
> pip install wordsegment
You can access documentation in the interpreter with Python’s built-in help function:
>>> import wordsegment >>> help(wordsegment)
In your own Python programs, you’ll mostly want to use segment to divide a phrase into a list of its parts:
>>> from wordsegment import segment
>>> segment('thisisatest')
['this', 'is', 'a', 'test']
WordSegment also provides a command-line interface for batch processing. This interface accepts two arguments: in-file and out-file. Lines from in-file are segmented iteratively, joined by a space, and written to out-file. Input and output default to stdin and stdout respectively.:
> echo thisisatest | python -m wordsegment this is a test
API Documentation
segment(text)
Return a list of words that is the best segmenation of text.
score(word, prev=None)
Score a word in the context of the previous word, prev.
divide(text, limit=24)
Yield (prefix, suffix) pairs from text with len(prefix) not exceeding limit.
unigram_counts
Mapping of (unigram, count) pairs. Loaded from the file ‘unigrams.txt’.
bigram_counts
Mapping of (bigram, count) pairs. Loaded from the file ‘bigrams.txt’.
Useful Links
WordSegment License
Copyright (c) 2014 Grant Jenks
Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
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