NLTK on Ubuntu Quick Start Guide ~ Philips Tech Support

Update July 19, 2009 : You can now use nltk python egg instead, read the NLTK Installation with Python setuptools post.

While attending a short program in computational linguistics at Dravidian University, Dr. Arul introduced me to NLTK (Natural Language Toolkit). It was full two years before that I finally decided to have a close look at it. Like most linguists at the lab I used Perl programming language. With new version of NLTK 2.0 released last month, NLTK now works with python 2.6. Here a quick start guide for NLTK on Ubuntu Linux.

Installing NLTK on Ubuntu with Python 2.6

At the time of writing this post the Debian package on NLTK download page is built for Python 2.5. Ubuntu ships with Python 2.6 by default. So you need to download the source package from the NLTK download page.

NLTK needs some dependency modules, lets install them.

sudo apt-get install python-numpy python-matplotlib prover9

Uncompress the source package and run the NLTK setup.

$ unzip nltk-2.0b3.zip $ cd nltk-2.0b3/ $ ls build LICENSE.txt nltk PKG-INFO README.txt setup.py yaml $ sudo python setup.py install

After finishing the NLTK setup, you should download the NLTK data which contains various corpora, tagsets and treebank data etc.

$ python Python 2.6.2+ (release26-maint, Jun 19 2009, 15:14:35) [GCC 4.4.0] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import nltk >>> nltk.download()

Learning NLTK

The best place to start is the NLTK book Natural Language Processing with Python Analyzing Text with the Natural Language Toolkit. The book is released under public domain, so you can read it online on NLTK website itself. I would recommand you to buy a copy of this book as the procceds will go into the future development of NLTK.