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Python Text Processing with NLTK 2.0 Cookbook

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Natural Language Processing is used everywhere—in search engines, spell checkers, mobile phones, computer games, and even in your washing machine. Python's Natural Language Toolkit (NLTK) suite of libraries has rapidly emerged as one of the most efficient tools for Natural Language Processing. You want to employ nothing less than the best techniques in Natural Language Processing—and this book is your answer.

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Python Text

Processing with

NLTK 2.0 Cookbook

Over 80 practical recipes for using Python's NLTK suite of

libraries to maximize your Natural Language Processing

capabilities.

Jacob Perkins

BIRMINGHAM - MUMBAI

Python Text Processing with NLTK 2.0

Cookbook

or transmitted in any form or by any means, without the prior written permission of the

publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the

information presented. However, the information contained in this book is sold without

warranty, either express or implied. Neither the author, nor Packt Publishing, and its

dealers and distributors will be held liable for any damages caused or alleged to be

caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the

companies and products mentioned in this book by the appropriate use of capitals.

However, Packt Publishing cannot guarantee the accuracy of this information.

First published: November 2010

Production Reference: 1031110

Published by Packt Publishing Ltd.

32 Lincoln Road

Olton

Birmingham, B27 6PA, UK.

ISBN 978-1-849513-60-9

www.packtpub.com

Cover Image by Sujay Gawand (sujay0000@gmail.com)

Credits

Author

Jacob Perkins

Reviewers

Patrick Chan

Herjend Teny

Acquisition Editor

Steven Wilding

Development Editor

Maitreya Bhakal

Technical Editors

Bianca Sequeira

Aditi Suvarna

Copy Editor

Laxmi Subramanian

Indexer

Tejal Daruwale

Editorial Team Leader

Aditya Belpathak

Project Team Leader

Priya Mukherji

Project Coordinator

Shubhanjan Chatterjee

Proofreader

Joanna McMahon

Graphics

Nilesh Mohite

Production Coordinator

Adline Swetha Jesuthas

Cover Work

Adline Swetha Jesuthas

About the Author

Jacob Perkins has been an avid user of open source software since high school, when

he rst built his own computer and didn't want to pay for Windows. At one point he had

ve operating systems installed, including Red Hat Linux, OpenBSD, and BeOS.

While at Washington University in St. Louis, Jacob took classes in Spanish and poetry

writing, and worked on an independent study project that eventually became his Master's

project: WUGLE—a GUI for manipulating logical expressions. In his free time, he wrote

the Gnome2 version of Seahorse (a GUI for encryption and key management), which has

since been translated into over a dozen languages and is included in the default Gnome

distribution.

After receiving his MS in Computer Science, Jacob tried to start a web development

studio with some friends, but since no one knew anything about web development,

it didn't work out as planned. Once he'd actually learned about web development, he

went off and co-founded another company called Weotta, which sparked his interest in

Machine Learning and Natural Language Processing.

Jacob is currently the CTO/Chief Hacker for Weotta and blogs about what he's learned

along the way at

http://streamhacker.com/. He is also applying this knowledge to

produce text processing APIs and demos at http://text-processing.com/. This book

is a synthesis of his knowledge on processing text using Python, NLTK, and more.

Thanks to my parents for all their support, even when they don't understand

what I'm doing; Grant for sparking my interest in Natural Language

Processing; Les for inspiring me to program when I had no desire to; Arnie

for all the algorithm discussions; and the whole Wernick family for feeding

me such good food whenever I come over.

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